Coventry Climax

Coventry Climax was a British manufacturer of forklift trucks, fire pumps, racing engines, and other speciality engines.

The company was started in 1903 as Lee Stroyer, a joint venture by Jens Stroyer and Horace Pelham Lee, a former Daimler employee, who saw an opportunity in the nascent internal combustion engine market. In 1905, following the departure of Stroyer, it was relocated to Paynes Lane, Coventry, and renamed as Coventry Simplex by Lee.

An early user was GWK, who produced over 1,000 light cars with Coventry-Simplex two-cylinder engines between 1911 and 1915. Just before the First World War, a Coventry-Simplex engine was used by Lionel Martin to power the first Aston Martin car. Ernest Shackleton selected Coventry-Simplex to power the tractors that were to be used in his Imperial Trans-Antarctic Expedition of 1914.

Hundreds of Coventry-Simplex engines were manufactured during the First World War to be used in generator sets for searchlights.

In 1919, Pelham Lee acquired an existing company, Johnson & Smith Ltd, and changed its name to Coventry Climax Engines Ltd with premises at East Street, Coventry. (Coventry Simplex continued under separate management).

Throughout the 1920s and 1930s, the company supplied engines to many companies manufacturing light cars such as Abbey, AJS, Albatross, Ashton-Evans, Bayliss-Thomas, Clyno, Crossley, Crouch, GWK, Marendaz, Morgan, Triumph, Swift, Standard, and Waverley Cars of London. In the early 1930s, the company also supplied engines for buses, and in 1935 supplied the 'L' engine to David Brown tractors for the 550 Model A, being a collaborative venture with Ferguson. In the 1920s, the company moved to Friars Road, Coventry, and in the late 1930s, they also acquired the former Riley premises on Widdrington Road, Coventry.

With the closure of Swift in 1931, the company was left with a stock of engines that were converted to drive electric generators, a field in which they had experience from building WW1 searchlight generators. They also started to make engine driven pumps, and mounted on a trailer as a mobile fire fighting appliance this was to be a great success. The economic problems of the 1930s hit the business hard, and Leonard Pelham Lee, who had taken over from his father, created a separate division of the company for the fire pumps. While the motor car engine business suffered during the recession, the mobile fire pump division of Coventry Climax became a great success, particularly during the late 1930s and this continued during the war.

Another diversification was into commercial vehicle engines. This started in 1929 with the launch of a large (5.8 litre) six-cylinder side-valve petrol engine intended for buses and trucks, and was followed in 1931 by a six-cylindered 6.8 litre petrol engine of inlet over exhaust (IOE) design, and a 4-cylinder engine in 1932. In 1934 Commercial Motor referred to the 'popular Coventry Climax engines' as the six-cylindered L6 and the four-cylindered B4 – the latter being of 'especially modern design with wet liners'. Examples of vehicles using the engines include the 1932 Karrier Bantam refuse truck, and the 1935 Gilford Motors CF176 coach.