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Suzuki K engine
Suzuki K engine
Suzuki K engine
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from Wikipedia
Suzuki K engine
Suzuki K15B engine
Overview
ManufacturerSuzuki
Production1994–present
Layout
Configuration
Displacement
  • 658 cc (0.66 L)
  • 996 cc (1.0 L)
  • 998 cc (1.0 L)
  • 1,171 cc (1.2 L)
  • 1,197 cc (1.2 L)
  • 1,242 cc (1.24 L)
  • 1,373 cc (1.4 L)
  • 1,462 cc (1.5 L)
Cylinder bore
  • 68 mm (2.7 in)
  • 71 mm (2.80 in)
  • 73 mm (2.87 in)
  • 74 mm (2.91 in)
Piston stroke
  • 60.4 mm (2.38 in)
  • 68.6 mm (2.70 in)
  • 71.5 mm (2.81 in)
  • 74 mm (2.91 in)
  • 74.2 mm (2.92 in)
  • 79.5 mm (3.13 in)
  • 82 mm (3.23 in)
  • 83 mm (3.27 in)
  • 85 mm (3.35 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
ValvetrainDOHC 4 valves per cylinder with VVT (since 1999)[1]
Valvetrain drive systemTiming Chain
Compression ratio8.4–13.0:1
RPM range
Max. engine speed6200–8500 rpm
Combustion
TurbochargerIHI, Mitsubishi
Fuel systemMultipoint fuel injection or direct injection
Fuel type
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output37–146 PS (36–144 hp; 27–107 kW)
Torque output55–235 N⋅m (6–24 kg⋅m; 41–173 lb⋅ft)
Chronology
Predecessor
Successor

The Suzuki K engine family is a series of automobile engines from Suzuki, introduced in 1994. Displacements range from 0.7 L to 1.5 L. All engines have aluminium cylinder blocks with three or four cylinders in-line. Cylinder heads have two overhead camshafts, driven by chain, and four valves per cylinder. Fuel is gasoline/petrol, metered by multipoint fuel injection or direct injection. Some variants are turbocharged.

Since 2013, some of the K engines range have been upgraded with Dualjet technology.[2] The upgrades include new two injectors per cylinder, increased compression ratio (improving the thermal efficiency), redesigned water jacket shape, piston cooling by oil jets, water-cooled EGR system and several other changes for fuel efficiency.[3] The turbocharged variant with direct injection fuel system is called Boosterjet.[4][5]

Furthermore, a mild hybrid technology with 12 or 48-volt Integrated Starter Generator (ISG) dubbed as Smart Hybrid Vehicle by Suzuki (SHVS) is available for markets with stricter emission regulation, such as Europe, Japan, India, Singapore and Mexico (marketed as Boostergreen). This mild hybrid technology helps to increase fuel mileage, providing optional acceleration and also reduces emissions.[6][7] A strong hybrid variant with Motor Generator Unit (MGU) is available in Europe and Japan.

Three-cylinder

[edit]

K6A

[edit]
Suzuki K6A turbo with Jatco JF012E CVT transmission

This is the first K engine, which first appeared in 1994 and was discontinued in 2018. It is the smallest in the family and also the first K engine with VVT.[1] This engine was available in several versions, such as naturally aspirated, turbocharged, lean-burn, CNG and strong hybrid. The hybrid version was also the first hybrid engine in the kei car class and only available in the Suzuki Twin.[8]

Technical specifications:

  • Displacement: 658 cc (0.66 L)
  • Bore and stroke: 68 mm x 60.4 mm
  • Valvetrain: DOHC, 12-valve, with or without VVT
  • Compression ratio: 8.4–8.9 (turbo), 10.5 (NA)
  • Maximum power:
    • 37–54 PS (27–40 kW; 36–53 hp) at 5500–6500 rpm (NA)
    • 60–64 PS (44–47 kW; 59–63 hp) at 6000–6500rpm (turbo)
    • 50 PS (36.8 kW; 49.3 hp) at 6500 rpm (CNG)
  • Maximum torque:
    • 55–63 N⋅m (6–6 kg⋅m; 41–46 lb⋅ft) at 3500–4000 rpm (NA)
    • 83–108 N⋅m (8–11 kg⋅m; 61–80 lb⋅ft) at 3000–3500rpm (turbo)
    • 58 N⋅m (6 kg⋅m; 43 lb⋅ft) at 3500 rpm (CNG)

Applications:

K10B

[edit]
Suzuki K10B engine

The three-cylinder 1.0-litre version of K engine, fitted in many Suzuki's city cars since 2008. In 2014, this engine was reworked by increasing the compression ratio from 10.0 to 11.0:1 and known as K-Next. This changes claimed to increase the petrol mileage over 23km/L, achieved maximum power on lower rev and reduced frictional losses.[9] CNG variant also available for Indian domestic market.

Technical specifications:

  • Displacement: 996 cc (1.0 L)
  • Bore and stroke: 73 mm x 79.4 mm
  • Valvetrain: DOHC, 12-valve
  • Compression ratio: 10.0–11.0
  • Maximum power:
    • 65–68 PS (48–50 kW; 64–67 hp) at 6000 rpm
    • 59 PS (43 kW; 58 hp) at 6000 rpm (CNG)
  • Maximum torque:
    • 90 N⋅m (66 lb⋅ft) at 3500 rpm
    • 78 N⋅m (58 lb⋅ft) at 3500 rpm (CNG)

Applications:

K10C

[edit]
Naturally aspirated K10C engine for European market Suzuki Celerio

Reworked version of K10B engine with naturally aspirated Dualjet or turbocharged direct injection Boosterjet technology. The compression ratio was increased from 11.0:1 to 12.0:1 for more thermal efficiency and reduced frictional losses. Suzuki's SHVS mild hybrid system is available for this engine in European and Japanese market. The CNG version is also available for Indian market.

Technical specifications:

  • Displacement: 998 cc (1.0 L)
  • Bore and stroke: 73 mm x 79.4 mm
  • Valvetrain: DOHC, 12-valve, Single or Dual VVT
  • Compression ratio: 10.0 (turbo), 12.0 (NA)
  • Maximum power:
    • 65–68 PS (48–50 kW; 64–67 hp) at 5500–6000 rpm (NA)
    • 57 PS (42 kW; 56 hp) at 5300 rpm (CNG)
    • 3 PS (2 kW; 3 hp) at 1000 rpm (electric motor)
    • 99–111 PS (73–82 kW; 98–109 hp) at 5500 rpm (turbo)
  • Maximum torque:
    • 89–93 N⋅m (9–9 kg⋅m; 66–69 lb⋅ft) at 3500 rpm (NA)
    • 82 N⋅m (8 kg⋅m; 60 lb⋅ft) at 3400 rpm (CNG)
    • 150–170 N⋅m (15–17 kg⋅m; 111–125 lb⋅ft) at 1500–4500 rpm (turbo)
    • 50 N⋅m (5 kg⋅m; 37 lb⋅ft) at 100 rpm (electric motor)

Applications:

Four-cylinder

[edit]

K10A

[edit]

The smallest four-cylinder K-series engine.

Technical specifications:

  • Displacement: 996 cc (1.0 L)
  • Bore and stroke: 68 mm x 68.6 mm
  • Valvetrain: DOHC, 16-valve, with or without VVT
  • Compression ratio: 8.4 (turbo), 10.0 (NA)
  • Maximum power:
    • 65–70 PS (48–51 kW; 64–69 hp) at 6500–7000 rpm (NA)
    • 100 PS (74 kW; 99 hp) at 6500 rpm (turbo)
  • Maximum torque:
    • 88 N⋅m (65 lb⋅ft) at 3500 rpm (NA)
    • 118 N⋅m (87 lb⋅ft) at 4000 rpm (turbo)

Applications:

K12A

[edit]

Technical specifications:

  • Displacement: 1,172 cc (1.2 L)
  • Bore and stroke: 71 mm x 74 mm
  • Valvetrain: DOHC, 16-valve
  • Compression ratio: 9.3
  • Maximum power:
    • 69 PS (51 kW; 68 hp) at 6000 rpm
  • Maximum torque:
    • 95 N⋅m (70 lb⋅ft) at 3250 rpm

Applications:

K12B

[edit]

Appeared first in 2008 and reworked with Dualjet technology in 2013.[2] In China, this engine was also used by Suzuki's former joint venture partners, Changan Suzuki and its subsidiaries. Known under E-Power EA12[10] or JL473Q[11] names.

Suzuki K12B Dualjet engine

Technical specifications:

  • Displacement: 1,242 cc (1.24 L)
  • Bore and stroke: 73 mm x 74.2 mm
  • Valvetrain: DOHC, 16-valve, VVT
  • Compression ratio: 11.0–12.0
  • Maximum power:
    • 86–92 PS (63–68 kW; 85–91 hp) at 5500–6000 rpm
  • Maximum torque:
    • 114–118 N⋅m (12–12 kg⋅m; 84–87 lb⋅ft) at 4400–4800 rpm

Applications:

K12C

[edit]

The Dualjet version of K12B engine and can also combined with 12-volt SHVS mild hybrid technology[12] or a strong hybrid system with Motor Generator Unit (MGU).[13][14]

Technical specifications:

  • Displacement: 1,242 cc (1.24 L)
  • Bore and stroke: 73 mm x 74.2 mm
  • Valvetrain: DOHC, 16-valve, Dual VVT
  • Compression ratio: 12.5
  • Maximum power:
    • 90–91 PS (66–67 kW; 89–90 hp) at 6000 rpm
    • 3 PS (2 kW; 3 hp) at 1000 rpm (mild hybrid electric motor)
    • 14 PS (10 kW; 14 hp) at 3185–8000 rpm (strong hybrid electric motor)
  • Maximum torque:
    • 120 N⋅m (12 kg⋅m; 89 lb⋅ft) at 4400 rpm
    • 50 N⋅m (5 kg⋅m; 37 lb⋅ft) at 100 rpm (mild hybrid electric motor)
    • 30 N⋅m (3 kg⋅m; 22 lb⋅ft) at 1000–3185 rpm (strong hybrid electric motor)

Applications:

K12D

[edit]

Replacing the previous K12C Dualjet engine for European (and several other markets), as the European emission standard has moved to Euro 6d stage. The displacement is the same as K12M and K12N Dualjet engines. The SHVS mild hybrid system is also standard.[12]

Technical specifications:

  • Displacement: 1,197 cc (1.2 L)
  • Bore and stroke: 73 mm x 71.5 mm
  • Valvetrain: DOHC, 16-valve, Dual VVT
  • Compression ratio: 13.0
  • Maximum power:
    • 83 PS (61 kW; 82 hp) at 6000 rpm
    • 3 PS (2 kW; 3 hp) at 800 rpm (electric motor)
  • Maximum torque:
    • 107 N⋅m (11 kg⋅m; 79 lb⋅ft) at 2000 rpm
    • 35 N⋅m (4 kg⋅m; 26 lb⋅ft) at 499 rpm (electric motor)

Applications:

K12M

[edit]
Suzuki K12M engine

Destroked version of the K12B, developed by Maruti Suzuki. Mainly for the Indian market as the country imposed higher excise tax for petrol engines larger than 1,200 cc. This engine is also available for markets in South East Asia, South America and Africa; in 2020 the K12D derivative was developed from this.

VVT technology was added for this engine in 2012. In February 2018, the Dualjet version was introduced first in Thailand with higher 11.5:1 compression ratio.[15][16]

Technical specifications:

  • Displacement: 1,197 cc (1.2 L)
  • Bore and stroke: 73 mm x 71.5 mm
  • Valvetrain: DOHC, 16-valve, with or without VVT
  • Compression ratio: 10.5–11.5
  • Maximum power:
    • 83–87 PS (61–64 kW; 82–86 hp) at 6000 rpm
    • 71 PS (52 kW; 70 hp) at 6000 rpm (CNG)
  • Maximum torque:
    • 108–113 N⋅m (11–12 kg⋅m; 80–83 lb⋅ft) at 4000–4400 rpm
    • 95 N⋅m (10 kg⋅m; 70 lb⋅ft) at 4000 rpm (CNG)

Applications:

K12N

[edit]

Dualjet version of K12M engine and also available with SHVS mild hybrid technology. A version for commercial vehicles with lower output is also available.

Technical specifications:

  • Displacement: 1,197 cc (1.2 L)
  • Bore and stroke: 73 mm x 71.5 mm
  • Valvetrain: DOHC, 16-valve, Dual VVT
  • Compression ratio: 12.0
  • Maximum power:
    • 90 PS (66 kW; 89 hp) at 6000 rpm
      80.7 PS (59 kW; 80 hp) at 6000 rpm (commercial vehicle)
    • 75.5 PS (56 kW; 74 hp) at 6000 rpm (CNG)
      71.6 PS (53 kW; 71 hp) at 6000 rpm (CNG, commercial vehicle)
  • Maximum torque:
    • 113 N⋅m (12 kg⋅m; 83 lb⋅ft) at 4200 rpm
      104.4 N⋅m (11 kg⋅m; 77 lb⋅ft) at 2900 rpm (commercial vehicle)
    • 98.5 N⋅m (10 kg⋅m; 73 lb⋅ft) at 4300 rpm (CNG)
      95 N⋅m (10 kg⋅m; 70 lb⋅ft) at 2800 rpm (CNG, commercial vehicle)

Applications:

K14B

[edit]
Suzuki K14B

Similar as K12B, this engine was also used by Suzuki's former joint venture partner in China. Known under E-Power EA14[10] or JL473Q1[17] names.

Technical specifications:

  • Displacement: 1,372 cc (1.4 L; 83.7 cu in)
  • Bore and stroke: 73 mm x 82 mm
  • Valvetrain: DOHC, 16-valve, VVT
  • Compression ratio: 10.0–11.0
  • Maximum power:
    • 92–96 PS (68–71 kW; 91–95 hp) at 6000 rpm
    • 84 PS (62 kW; 83 hp) at 6000 rpm (CNG)
  • Maximum torque:
    • 130–134 N⋅m (13–14 kg⋅m; 96–99 lb⋅ft) at 4000–4800 rpm
    • 110 N⋅m (11 kg⋅m; 81 lb⋅ft) at 4000–4800 rpm (CNG)

Applications:

K14C

[edit]
Tuned Suzuki K14C engine
Suzuki K14C engine

Boosterjet version of K14B engine with direct injection and turbocharger. This engine is no longer available since mid-2020 for European market and replaced by K14D Boosterjet mild hybrid engine.

Technical specifications:

  • Displacement: 1,372 cc (1.4 L)
  • Bore and stroke: 73 mm x 82 mm
  • Valvetrain: DOHC, 16-valve, VVT
  • Compression ratio: 9.9
  • Maximum power:
    • 136–146 PS (100–107 kW; 134–144 hp) at 5500 rpm
  • Maximum torque:
    • 210–230 N⋅m (21–23 kg⋅m; 155–170 lb⋅ft) at 1500–4000 rpm

Applications:

K14D

[edit]

Reworked K14C Boosterjet engine for European market. Combined with a 48-volt SHVS mild hybrid technology to pass Euro 6d emission standard.[23]

Technical specifications:

  • Displacement: 1,372 cc (1.4 L)
  • Bore and stroke: 73 mm x 82 mm
  • Valvetrain: DOHC, 16-valve, Dual VVT
  • Compression ratio: 10.8
  • Maximum power:
    • 129 PS (95 kW; 127 hp) at 5500 rpm
    • 14 PS (10 kW; 14 hp) at 3000 rpm (electric motor)
  • Maximum torque:
    • 235 N⋅m (24 kg⋅m; 173 lb⋅ft) at 2000 rpm
    • 53 N⋅m (5 kg⋅m; 39 lb⋅ft) at 3000 rpm

Applications:

K15B

[edit]
The K15B engine installed longitudinally in the Jimny

The biggest engine in the range. SHVS mild hybrid system also available and claimed over 17% more fuel efficient that the non-SHVS engine.[24]

Technical specifications:

  • Displacement: 1,462 cc (1.5 L)
  • Bore and stroke: 74 mm x 85 mm
  • Valvetrain: DOHC, 16-valve, VVT
  • Compression ratio: 10.0–10.5
  • Maximum power:
    • 102–106 PS (75–78 kW; 101–105 hp) at 6000 rpm
    • 92 PS (68 kW; 91 hp) at 6000 rpm (CNG)
  • Maximum torque:
    • 130–138 N⋅m (13–14 kg⋅m; 96–102 lb⋅ft) 4000–4400 rpm
    • 122 N⋅m (12 kg⋅m; 90 lb⋅ft) at 4400 rpm (CNG)

Applications:

K15B-C

[edit]
Suzuki K15B-C engine

This engine is similar as the regular K15B, but designed for commercial use. The differences are including different cylinder head cover made from metal with 7 bolts instead of resin material with 12 bolts on the regular K15B engine, different intake manifold position, shorter camshaft profile, lower compression ratio pistons, different timing chain cover design without engine mount (similar as the previous generation Suzuki Carry) and different oil pan shape.[25]

Technical specifications:

  • Displacement: 1,462 cc (1.5 L)
  • Bore and stroke: 74 mm x 85 mm
  • Valvetrain: DOHC, 16-valve
  • Compression ratio: 10.0
  • Maximum power:
    • 97 PS (71 kW; 96 hp) at 5600 rpm
  • Maximum torque:
    • 135 N⋅m (14 kg⋅m; 100 lb⋅ft) at 4400 rpm

Application:

K15C

[edit]

Dualjet version of K15B engine, it is available in Europe and Japan with 140V strong hybrid combined to a Motor Generator Unit (MGU). Mild hybrid and CNG version is also available, the latter is only available in India.

Technical specifications:

  • Displacement: 1,462 cc (1.5 L)
  • Bore and stroke: 74 mm x 85 mm
  • Valvetrain: DOHC, 16-valve, Dual VVT
  • Compression ratio: 12.0–13.0
  • Maximum power:
    • 99–103 PS (73–76 kW; 98–102 hp) at 6000 rpm
    • 87 PS (64 kW; 86 hp) at 5500 rpm (CNG)
    • 3 PS (2 kW; 3 hp) at 900 rpm (MHEV electric motor)
    • 33 PS (24 kW; 33 hp) at 5500 rpm (HEV electric motor)
    • 115 PS (85 kW; 113 hp) at 5500 rpm (petrol + HEV electric motor)
  • Maximum torque:
    • 132–137 N⋅m (13–14 kg⋅m; 97–101 lb⋅ft) at 4400 rpm
    • 122 N⋅m (12 kg⋅m; 90 lb⋅ft) at 4200 rpm
    • 60 N⋅m (6 kg⋅m; 44 lb⋅ft) at 100-2000 rpm (HEV electric motor)

Application:

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Suzuki K engine

View on Grokipedia
from Grokipedia
The Suzuki K engine family is a series of compact, inline-three and inline-four gasoline engines produced by the Japanese automaker , with displacements ranging from 660 cc to 1.5 L and initial production beginning in 1994. Characterized by lightweight all-aluminum construction, double overhead camshafts (DOHC), and four valves per , the K series emphasizes , reduced (NVH), and reliable performance for applications in kei cars, subcompact hatchbacks, and small sedans across global markets, particularly in . Introduced globally with the three-cylinder K6A variant for kei vehicles like the and Wagon R, the family expanded to include four-cylinder options such as the K10A in 1997 for export models and the K14B in 2010 for enhanced power outputs up to 95 hp. In , via , the K series debuted in 2008 with the 1.0 L K10B in the A-Star hatchback, quickly becoming a cornerstone for models like the , Swift, and Baleno due to its balance of economy and drivability. Advanced iterations incorporate technologies such as Dual Jet dual-injector systems for stratified charge combustion, on intake and exhaust cams, cooled , and optional SHVS mild-hybrid assistance, achieving improved thermal efficiencies and ARAI-certified mileage exceeding 25 km/L in select variants. The series also features offset crankshafts, hydraulic lash adjusters (HLA), low-tension piston rings, and Smart Distributorless Ignition (SDLI) for smoother operation and lower emissions compliance with standards like BS6. By 2025, over 6.3 million K-series units have been produced by Maruti Suzuki, predominantly in India, underscoring their role in Suzuki's strategy for affordable, efficient mobility amid rising demand for eco-friendly small engines.

Overview

Family introduction

The Suzuki K engine family comprises a series of compact, lightweight gasoline engines developed by Suzuki Motor Corporation, first introduced in 1994 and remaining in active production as of 2025. Featuring displacements from 660 cc (0.66 L) to 1.5 L in inline-three and inline-four configurations, these engines prioritize aluminum construction for reduced weight and improved efficiency. They serve primarily in kei cars, subcompact vehicles, and compact cars produced by and , powering models for urban mobility in , , and international markets. Integral to Suzuki's engineering approach, the K family emphasizes fuel-efficient designs that support compliance with evolving global emissions regulations, balancing performance with environmental considerations. Encompassing over a dozen variants, the lineup has progressed from basic naturally aspirated units to advanced iterations with features like turbocharging and integrated hybrid assistance.

Key characteristics

The Suzuki K engine family features an all-aluminum construction for both the cylinder block and head, which significantly reduces overall weight while enhancing heat dissipation for improved and performance in compact vehicles. This , combined with an innovative rocker-less configuration, contributes to lower friction and better fuel economy across the series. A core shared trait is the dual overhead camshaft (DOHC) , employing 4 per (16 valves total in four-cylinder variants) driven by a silent timing chain, which ensures precise , reduced (NVH), and long-term reliability without the need for belt replacements. Multi-point (MPFI) is standard throughout the family, delivering fuel directly to each for optimal combustion efficiency, with later models incorporating to refine response and integrate with advanced engine management systems. Bore and stroke configurations in the K series emphasize an oversquare or near-square layout in many variants, such as the K6A's 68 mm bore and 60.4 mm stroke, promoting higher engine revs, smoother operation, and enhanced suitable for lightweight applications. Compression ratios typically range from 10:1 to 12:1, calibrated to operate efficiently on regular unleaded while maximizing power output and minimizing emissions.

History

Development origins

The Suzuki K engine family was developed as a successor to the company's F-series engines, which had powered kei vehicles but were increasingly inadequate for meeting tightened fuel economy and emissions requirements in the segment. The F-series, primarily three-cylinder designs, were optimized for earlier kei standards but faced challenges with rising environmental regulations and consumer demands for more efficient urban transport. By the early , Suzuki engineers prioritized a new architecture to deliver improved and lower pollutant output while maintaining the compact footprint essential for Japan's kei market. Initial development centered on compliance with Japanese regulations, which in 1990 increased the limit to 660 cc from 550 cc to encourage technological advancement without expanding vehicle size. This cap directly influenced the design of the inaugural K6A model, ensuring it fit within the class's strict dimensions and power limits for and benefits. Key goals included a —base units weighing under 100 kg through extensive use of aluminum alloys—to enhance vehicle agility and economy, alongside high specific output exceeding 90 hp/L in turbo variants and targeted reductions in (NVH) via refined balancing and mounting systems. The project involved internal engineering teams, incorporating emissions testing aligned with (JIS) for domestic certification and preliminary norms for potential export markets. This collaboration ensured the engines could handle both local and international scrutiny on and levels from inception. The K family debuted in September 1994 with the K6A, coinciding with surging demand for fuel-efficient engines in densely populated urban areas, where kei vehicles dominated sales for their low operating costs and maneuverability.

Production milestones

Following the initial launch of three-cylinder variants, the Suzuki K engine family expanded in the late with the introduction of four-cylinder models, such as the 1.0-liter K10A in , designed to power export versions of subcompact vehicles like the Wagon R and address growing demand in international markets. In the 2000s, key advancements included the integration of (VVT) technology by 2005, as seen in updated models like the Jimny, which improved low-end torque and overall efficiency while achieving Euro 4 emissions compliance to meet evolving European regulatory standards. The 2010s marked a shift toward with the debut of the SHVS (Smart Hybrid Vehicle by ) system in 2015, featuring an integrated starter generator to support operation during and enhance economy in compact cars. The K6A was succeeded by the R-series in kei applications starting in 2011. Into the , the K family received further refinements, including Dualjet dual-injector technology paired with Euro 6d emissions compliance in models like the 2022 S-Cross, enabling stricter real-world pollutant limits. Production continues robustly in through as of 2025, supporting local and export needs with next-generation variants. Cumulatively, over 10 million K-series engines have been produced worldwide as of the early 2020s, manufactured across facilities in (Sagara Plant for engines), ( plants), and ( for assembly integration).

Three-cylinder engines

K6A

The K6A is the inaugural engine in Suzuki's K-series family, a three-cylinder inline design with a displacement of 658 cc, achieved through a bore of 68.0 mm and a stroke of 60.4 mm. It features a chain-driven double overhead camshaft (DOHC) configuration with 12 valves, enabling efficient operation in compact kei vehicles. Power outputs for the K6A range from 46 PS in naturally aspirated (NA) configurations to 64 PS in forced-induction variants, with torque varying between 56 N⋅m and 92 N⋅m depending on the setup. These figures support compliance with Japanese regulations, prioritizing lightweight performance and fuel efficiency in urban applications. Introduced in 1994, the K6A remains in production as of 2025, serving as the foundational powerplant for models including the , Wagon R, Hustler, and kei trucks such as the Carry. Unique to the series, it was the first K-engine offered with a centrifugal to maximize output within kei displacement limits, alongside NA and turbocharged editions tailored for Japanese market standards. Later revisions incorporated () for improved efficiency, building on the family's core DOHC architecture.

K10B

The K10B is a 1.0-liter three-cylinder engine from Suzuki's K-series family, optimized for compact vehicles in emerging markets where fuel economy and low emissions are priorities. With a displacement of 998 cc, it employs a long-stroke design featuring a bore of 73.0 mm and a of 79.4 mm, which contributes to strong low-end torque suitable for urban driving. The compression ratio stands at 10:1 in base variants, rising to 11:1 in updated versions for improved . Power output is 65-68 PS (48-50 kW) depending on tuning and market requirements, with CNG variants detuned to around 50 PS, paired with figures between 90 and 95 N⋅m, delivering responsive performance without excessive fuel consumption. Introduced in 2008 in models like the A-Star, the K10B received the Dualjet dual-injector system in 2014 as part of Suzuki's push for efficient small-displacement powertrains—one per port per —which enhances fuel atomization and for up to 20% better over single-injector predecessors, alongside idle start-stop capability to minimize idling losses in stop-go traffic. Produced from 2008 to the present, the K10B powers models such as the and Ignis, as well as variants exported to regions like and . Available exclusively in naturally aspirated form, it is tuned for compliance with stringent low-emission standards in developing economies, emphasizing affordability and reliability over high performance.

K10C

The K10C is a 1.0-liter inline-three from Suzuki's K-series family, distinguished by its Boosterjet direct-injection system and integration of the SHVS (Smart Hybrid Vehicle by Suzuki) technology for enhanced efficiency and emissions performance. Introduced as an evolution of the earlier K10B, it debuted in 2017 with the fourth-generation in , marking Suzuki's push toward hybrid-assisted small-displacement engines to meet stringent regulatory standards. With a displacement of 998 cc and dimensions of 73.0 mm bore by 79.5 mm stroke, the K10C employs a DOHC with 12 valves and for optimized performance across the rev range. It delivers a maximum output of 111 PS (82 kW) at 5,500 rpm and 170 N⋅m of from 2,000 to 3,500 rpm, where the belt-driven integrated starter generator (ISG) contributes up to 50 N⋅m of assist during and enables smooth stop-start functionality. The 12-volt SHVS setup, featuring a charged via , supports fill, coasting deceleration , and idle-off capability, resulting in combined fuel economy figures exceeding 50 (WLTP) and CO2 emissions as low as 97 g/km to achieve Euro 6 compliance. Production of the K10C has spanned from 2017 to the present in select markets, primarily as the SHVS variant without non-hybrid options, emphasizing CO2 reduction below 100 g/km through its lightweight aluminum block and efficient hybrid integration. Key applications include the Hybrid and SX4 S-Cross crossover in , where it pairs with five- or six-speed manual transmissions or a six-speed automatic, providing agile performance in compact vehicles while prioritizing environmental goals.

Four-cylinder engines

K10A

The K10A is a 1.0-liter inline-four engine from Suzuki's K-series family, serving as an entry-level option for lightweight, front-wheel-drive vehicles in the segment. Introduced in with the Wagon R Wide, it emphasizes compact dimensions and smooth operation suitable for urban commuting. The engine's design prioritizes efficiency in small platforms, featuring a naturally aspirated configuration with multi-point (MPFI) for reliable performance. With a displacement of 996 cc, the K10A achieves this through a bore of 68.0 mm and a of 68.6 mm, paired with a of 10:1 in standard naturally aspirated variants. Power outputs typically range from 65 to 70 PS, delivering torque between 88 and 95 N⋅m, providing adequate propulsion for subcompact models without excessive fuel consumption. Later iterations incorporated (VVT) to enhance low-end response and overall efficiency. The four-cylinder DOHC layout contributes to its refined character compared to smaller three-cylinder alternatives. Produced from 1997 to 2000, the K10A powered key models including the Wagon R, Wagon R+, and Solio, as well as select early Alto and Swift variants in export markets. Its MPFI-equipped naturally aspirated setup was tailored for everyday reliability, but it was gradually replaced by three-cylinder designs like the K10B for improved fuel economy and reduced weight in subsequent lightweight vehicles.

K12A

The Suzuki K12A is a 1.2-liter naturally aspirated four-cylinder from the K-series family, featuring a displacement of 1,172 cc achieved through a bore of 71 mm and a stroke of 74 mm. It employs a chain-driven double overhead camshaft (DOHC) design with 16 valves, providing reliable valve timing, and optional variable valve timing (VVT) for improved efficiency in select configurations. Launched in 1998, the engine was produced until approximately 2000, primarily powering compact vehicles in the segment. Power output for the K12A typically ranges from 69 PS (51 kW) at 6,000 rpm, with peaking at 95 N⋅m (70 lb⋅ft) at 3,250 rpm, though some tuned variants reached up to 79 PS in export markets for enhanced performance. This setup delivered balanced mid-range response suitable for urban driving, with a of around 9.3:1 contributing to its smooth operation and moderate fuel economy. The engine's aluminum block and head construction minimized weight, aligning with the K-series emphasis on lightweight design for better vehicle handling. Key applications included the (1998–2000), where it served as the base powerplant for both front-wheel-drive and all-wheel-drive models, offering adequate performance for city commuting without advanced systems. Although distinct from sportier derivatives like the M16A, the K12A shared modular architecture elements, allowing for potential tuning in performance-oriented setups. All variants were naturally aspirated, with export versions occasionally tuned for higher output to meet regional demands, but it remained focused on reliability over high-revving capability.

K12B

The K12B is a 1.2-liter inline-four from Suzuki's K-series family, introduced in as a refined naturally aspirated unit emphasizing and compact performance. It features a displacement of 1,242 cc, achieved with a bore of 73.0 mm and a stroke of 74.2 mm, paired with a of 11:1. The engine employs a DOHC 16-valve with (VVT) for optimized intake and exhaust phasing, contributing to its responsive power delivery across everyday driving conditions. Power output ranges from 68 to 94 PS (50–69 kW) at 5,500–6,000 rpm, while varies between 114 and 118 N⋅m (11.6–12.0 kg⋅m) at 4,000–4,400 rpm, depending on the tune and market-specific calibration. Unique efficiency enhancements include the Dualjet system, introduced in , which uses dual injectors per positioned near the intake valves for finer fuel atomization and up to 16% better fuel economy compared to the standard multi-point injection setup. Additionally, from 2016, select variants incorporate Suzuki's SHVS technology, featuring a belt-driven integrated starter generator for assist, , and idle start-stop functionality to further reduce emissions and improve mileage. Produced from 2008 to the present, the K12B powers popular models in and other markets, including the Swift, Dzire, and Baleno, where it supports lightweight chassis for agile handling and competitive economy. Variants include naturally aspirated versions for base trims, setups for premium efficiency-focused applications, and CNG-adapted configurations tailored for the Indian market to meet demand for low-cost alternative fuels.

K12C

The K12C is a turbocharged 1.2-liter inline-four from Suzuki's K-series family, designed for performance-oriented applications in compact SUVs and hot hatches. Featuring a displacement of 1,195 cc and a bore × stroke of 71.0 mm × 75.6 mm, it incorporates direct injection and a as part of Suzuki's Boosterjet technology to achieve a balance of power and efficiency. Launched in 2016, the engine has been produced from that year to the present, powering sporty models such as the Boosterjet and Swift Sport. Power outputs for the K12C range from 89 to 140 PS, with torque figures spanning 150 to 200 N⋅m, enabling responsive acceleration and dynamic driving characteristics suitable for all-wheel-drive compatibility. The turbo-only variants emphasize low-end delivery for urban and performance, distinguishing the K12C from naturally aspirated K-series engines. This configuration supports Suzuki's toward downsized turbo engines in the , enhancing overall vehicle agility without sacrificing fuel economy.

K12D

The K12D is a 1.2-liter inline-four from Suzuki's K-series family, featuring a displacement of 1,197 cc achieved through a bore of 73.0 mm and a stroke of 71.5 mm. It is a destroked of the K12B, optimized for efficiency and emissions compliance in compact vehicles. The engine employs a DOHC 16-valve with Dualjet dual-injector technology and (VVT), paired with Suzuki's SHVS (Smart Hybrid Vehicle by Suzuki) system, including an integrated starter generator for torque assist, , and idle start-stop. In its configuration, the K12D delivers 83 PS (61 kW) at 6,000 rpm and 113 N⋅m of at 4,200 rpm from the , with the adding up to 3 PS and 50 N⋅m for improved low-end response and economy up to 25 km/L in hybrid variants. The setup ensures compliance with Euro 6d and equivalent standards through advanced combustion and electric assistance, focusing on urban efficiency without full hybrid complexity. Introduced in 2016 primarily for European and select Asian markets, the K12D has been produced from that year to the present, powering models such as the Hybrid, Ignis Hybrid, and Baleno Hybrid, where it provides balanced performance for city driving and light highway use. As of 2025, it remains in use, though some models are transitioning to the new Z-series three-cylinder engines.

K12M

The K12M is a specialized 1.2 L four-cylinder variant of Suzuki's K-series engine, tailored for emerging markets with a focus on and emission compliance. It has a displacement of 1,197 cc, achieved through a bore of 73.0 mm and a stroke of 71.5 mm, making it a de-stroked of the standard K12B design to align with regional tax and regulatory categories. Introduced in 2009 primarily for the Indian market via , the engine powers compact cars suited to urban environments and high-volume production needs. In its naturally aspirated petrol configuration, the K12M delivers a maximum power output of 85 PS at 6,000 rpm and 113 N⋅m of at 4,200 rpm, providing responsive low-end for city driving. The engine incorporates a DOHC 16-valve with (VVT), and later updates added Dual Jet injection for more precise delivery and reduced emissions. These features contribute to a claimed of up to 20.89 km/L under standard testing conditions. The K12M was optimized for alternative fuels, particularly CNG and bi-petrol blends, with reinforced internals such as stronger pistons and valves to handle the higher operating temperatures and pressures associated with these fuels. This enables flex-fuel capability in bi-fuel setups, allowing seamless switching between petrol and CNG without performance degradation beyond expected . On CNG, output is tuned to around 67 PS while preserving torque characteristics for economical operation in fuel-scarce regions. Production of the K12M occurred from 2009 to the present, with applications in models like the WagonR, Dzire, and export-oriented vehicles across . A flex-fuel naturally aspirated version saw limited production, targeted at markets emphasizing alternative energy adoption, though it remained niche due to infrastructure constraints. The engine's architecture draws briefly from the broader K12 family for shared components like the cylinder block, enhancing manufacturability without altering core tuning.

K12N

The K12N is a 1.2-liter inline-four from Suzuki's K-series, optimized for bi-fuel operation with (CNG) in markets prioritizing low emissions, such as . Featuring a displacement of 1,197 cc and bore × stroke dimensions of 73.0 mm × 71.5 mm, it employs dual overhead camshafts (DOHC) with 16 valves and dual (VVT) for improved efficiency across fuel modes. In CNG mode, the engine produces 71 PS (52.7 kW) at 6,000 rpm and 105 N⋅m of at 3,000 rpm, supported by sequential gas injection that ensures precise metering for smooth performance and minimal emissions. This setup incorporates a factory-fitted S-CNG kit, enabling BS-VI compliance through reduced CO2 and output compared to conventional petrol engines, while maintaining compatibility with urban driving demands. Introduced in 2020 as part of Maruti Suzuki's transition to BS-VI norms, the K12N CNG variant entered production in 2022 and remains in use, powering models like the Eeco CNG for affordable, low-cost transport in densely populated areas. Its bi-fuel design allows automatic switching between petrol and CNG, prioritizing gaseous fuel for extended range and cost savings in CNG-available regions. The sequential gas injection system aligns with broader K-series advancements in fuel delivery for cleaner combustion.

K14B

The K14B is a 1.4-liter naturally aspirated inline-four engine from Suzuki's K-series family, featuring a displacement of 1,372 cc achieved through a bore of 73.0 mm and a stroke of 82.0 mm. It employs a DOHC 16-valve with (VVT) as standard, along with multi-point (MPFI) for efficient combustion, and a ranging from 10.0:1 to 11.0:1 depending on the application. The engine's aluminum block and head construction contributes to its lightweight design, while its undersquare configuration prioritizes low-end torque suitable for compact vehicles. Power output for the K14B varies between 85 PS and 95 PS (63–70 kW) at around 6,000 rpm, with torque ranging from 115 N⋅m to 130 N⋅m at 4,000 rpm, providing balanced performance for urban driving and light loads. These figures reflect tuning for and emissions compliance, often paired with 5- or 6-speed manual or CVT transmissions. The engine's design includes hydraulic lifters and a for durability, and it is particularly balanced for all-wheel-drive (AWD) applications, enabling smooth power delivery in models with selectable 4WD systems. Introduced in 2007 for the Chinese market in the MPV, the K14B entered wider global production around 2010, powering vehicles like the , SX4, and APV vans until at least 2017 in various export markets. Its variants are primarily naturally aspirated configurations optimized for export regions, emphasizing reliability and economy over high performance, with no turbocharged options in this base form. Applications include the second-generation for agile handling, the SX4 crossover for AWD versatility, and the APV multi-purpose for commercial utility.

K14C

The K14C is a high-performance turbocharged 1.4-liter inline-four from Suzuki's K-series family, designed to deliver responsive power and efficient performance in compact vehicles. With a displacement of 1,373 cc and a bore × stroke of 73.0 mm × 82.0 mm, it features direct and a of 9.9:1, enabling strong low-end for agile and dynamic handling. The engine's Boosterjet , paired with an , provides smooth power delivery from as low as 1,500 rpm, making it suitable for sport-oriented applications while maintaining compatibility with 6-speed automatic transmissions. Introduced in as part of Suzuki's push toward downsized turbo technology, the K14C debuted in the Vitara S crossover and has since powered international models like the Swift Sport, emphasizing enthusiastic driving dynamics over basic utility. Power outputs range from 138 to 140 PS (103 kW) at 5,500 rpm, with peaking at 220 N⋅m, though tuned variants in sport models can reach 230 N⋅m between 2,500 and 3,500 rpm for enhanced mid-range punch. This configuration prioritizes immediate throttle response and balanced power distribution, contributing to the engine's reputation for lively performance in everyday and spirited driving scenarios. Production of the K14C continues to the present, with variants optimized for specific vehicle platforms, including turbocharged setups tuned for superior handling in models like the Swift Sport. These adaptations focus on integrating the engine's broad band with enhancements, ensuring consistent power delivery across front-wheel-drive and all-wheel-drive configurations without compromising .

K14D

The K14D is a 1.4-liter inline-four from Suzuki's K-series family, introduced in 2019 as part of the company's expansion into mild hybrid technology for improved efficiency and performance in compact vehicles. It features a displacement of 1,373 cc, achieved with a bore of 73 mm and a of 82 mm, enabling a of 10.8:1. The engine delivers a maximum power output of 129 PS (95 kW) at 5,500 rpm and peak of 235 N⋅m between 2,000 and 3,000 rpm, providing strong low-end response suitable for urban and highway driving. Equipped with direct , a , and dual (VVT), the K14D emphasizes balanced power delivery and reduced turbo lag. Its integration with a 48V system includes an integrated starter generator (ISG) that contributes up to 13 PS and 53 N⋅m of additional during acceleration, while also enabling and engine stop-start functionality for better fuel economy, typically around 5.5–6.0 L/100 km in combined cycle testing. This setup ensures compliance with Euro 6d emissions standards through advanced exhaust aftertreatment, including a particulate filter adapted for petrol applications. The engine was designed for transverse front-wheel-drive or all-wheel-drive configurations, paired with 6-speed manual or automatic transmissions. Primarily targeted at European markets, the K14D powered models such as the and SX4 S-Cross from 2019 to the present, where it offered competitive torque for agile handling in crossover SUVs weighing around 1,200–1,300 kg. In the Vitara, for example, it enabled 0–100 km/h acceleration in approximately 9.5 seconds while maintaining CO2 emissions below 120 g/km. Production continues as of 2025, powering models such as the and SX4 S-Cross in European and other markets, with potential transitions in select regions to alternative powertrains. No diesel variants exist, distinguishing it from earlier K-series diesels like the 1.6 DDiS.

K15B

The K15B is a 1.5-liter naturally aspirated inline-four from Suzuki's K-series family, designed for multi-purpose vehicles and offering balanced performance with efficiency. It has a displacement of 1,462 cc, achieved via a bore of 74.0 mm and a of 85.0 mm. The engine employs a of 10.5:1 and delivers power outputs ranging from 95 to 105 PS at 6,000 rpm, with maximum of 138 N⋅m at 4,400 rpm in its standard petrol configuration. These figures vary slightly by market and variant, with lower outputs in CNG mode for dual-fuel applications. Introduced in as part of 's push toward more efficient powertrains, the K15B incorporates idle start-stop technology to reduce fuel consumption during stops, contributing to improved urban mileage. An optional SHVS (Smart Hybrid Vehicle by Suzuki) system is available in select models, integrating a and integrated starter generator for and torque assist, enhancing overall efficiency without full hybrid complexity. The engine's aluminum construction and multi-point system support its lightweight design and responsive response. Produced from 2018 to the present, the K15B powers several models in and equivalent vehicles elsewhere, including the XL6, Ertiga, and Eeco multi-purpose vehicles, where it provides adequate low-end for family-oriented driving. Variants include the standard naturally aspirated petrol version and CNG-compatible setups tailored for the Indian market, allowing seamless switching between fuels for cost savings and reduced emissions in commercial and personal use.

K15B-C

The K15B-C is a 1.5-liter inline-four featuring a dedicated system, designed primarily for enhanced and reduced emissions in urban applications. With a displacement of 1,462 cc and a bore × stroke of 74.0 mm × 85.0 mm, it employs a DOHC 16-valve configuration and incorporates Dualjet dual-port technology from its base design. The engine's setup utilizes a 12V SHVS (Smart by ) system, which includes an integrated starter generator (ISG) acting as a to provide assist and . This configuration achieves a system total power output of 103 PS (76 kW) at 6,000 rpm, with the contributing 101 PS and the electric assist adding approximately 2 PS, while reaches 138 N⋅m at 4,400 rpm from the combustion unit plus up to 50 N⋅m of electric boost for smoother acceleration. Introduced in 2022, the K15B-C emphasizes eco-friendly features tailored for compliance with stringent emission standards, including BS-VI phase 2 norms effective in from April 2023. Key hybrid functionalities include to recharge the during deceleration, idle start-stop to minimize fuel use at halts, and torque assist for improved low-speed drivability in city traffic. The pack, smaller than those in full hybrids, supports these operations without enabling electric-only driving, focusing instead on optimizing the petrol engine's efficiency for hybrid variants exclusively. This setup contributes to claimed fuel economy figures around 21 km/l in real-world urban cycles, prioritizing seamless integration over standalone electric performance. Production of the K15B-C continues from 2022 to the present, powering select models in the Indian market such as the Grand Vitara and Fronx crossover . These applications leverage the engine's compact all-aluminum block for lightweight construction and balanced performance in compact s, with transmission options including a 5-speed manual or 6-speed automatic. The SHVS technology builds on Suzuki's earlier 2016 implementations but is refined here for BS-VI phase 2, incorporating cooled EGR and advanced air-fuel mixing to further lower CO2 and emissions without compromising drivability.

K15C

The K15C is a 1.5-liter inline-four from Suzuki's K-series family, featuring a displacement of 1,462 cc achieved through a bore of 74 mm and a stroke of 85 mm. It employs a DOHC with 16 valves and dual (VVT) for optimized performance and efficiency across various operating conditions. The engine incorporates dual injectors—combining port and direct injection—along with cooled (EGR) to reduce emissions while maintaining smooth power delivery. Introduced in 2022 as an evolution of the K15B, the K15C emphasizes refined fuel economy and low-end torque, producing a maximum output of 103 PS (76 kW) at 6,000 rpm and 138 Nm of torque at 4,400 rpm in its standard configuration. A key feature is its integration with Suzuki's Smart Hybrid Vehicle by (SHVS) system, a 12-volt setup that includes an integrated starter generator (ISG) for and torque assist, boosting combined output to around 116 PS in select applications. This hybrid option enhances drivability in urban settings by providing instant torque fill during acceleration, contributing to improved overall efficiency without the complexity of full hybrid systems. Since its launch, the K15C has been produced from 2022 to the present, powering a range of compact and mid-size vehicles in global markets, including the Ertiga, Ciaz, Brezza, and Grand Vitara in , as well as the in regions like the and . It is available in variants tailored for performance-oriented segments, where it pairs with either five- or six-speed manual transmissions or automatic units to deliver balanced responsiveness in crossover SUVs and sedans. The engine's design prioritizes lightweight construction and NVH reduction, making it suitable for everyday driving in diverse markets from to .

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