The company was started in 1903 as
Lee Stroyer, but two years later, following the departure of Stroyer, it was relocated to Paynes Lane,
Coventry, and renamed as
H. Pelham Lee,
 a former
Daimler employee, who saw a need for competition in the nascent
piston engine market.
An early user was
GWK, who produced over 1,000 light cars with Coventry-Simplex two-cylinder engines between 1911 and 1915. Just before
World War I 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 World War I to be used in generating sets for
searchlights. In 1917 the company was renamed Coventry Climax and moved to East Street, Coventry.
Throughout the 1920s and 1930s they supplied engines to many companies manufacturing light cars such as
Standard. 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. In the early 1930s the company also supplied engines for buses.
With the closure of Swift in 1931, the company was left with a stock of engines that were converted to drive electric generators, giving the company an entry into a new field. The economic problems of the 1930s hit the business hard and Leonard Pelham Lee, who had taken over from his father, diversified into the production of water-pumping equipment and the "Godiva" was born.
Going into the war, Coventry Climax used their marine diesel experience to further develop and build the
Armstrong Whitworth supercharged H30
multifuel engine for military use. This has been fitted as an
auxiliary engine in the British
Challenger battle tanks and
Rapier anti-aircraft missile systems.
Coventry Climax ET 199 (1949 model)
In the late 1940s, the company shifted away from automobile engines and into other markets, including marine diesels,
fire pumps, and forklift trucks. In 1946, the ET199 was announced, which the company claimed was the first British-produced forklift truck. The ET199 was designed to carry a 4,000 lb (1,800 kg) load with a 24-inch (610 mm) load centre, and with a 9 ft (2.7 m) lift height.
Harry Mundy (previously of
Walter Hassan (previously employed by
Jaguar) joined Coventry Climax, and a new lightweight all-aluminium
overhead camshaft engine was developed in response to the government's ambitious requisition outline asking for a portable fire pump that was capable of pumping double the amount of water specified in the previous outline, with half the weight.
This was designated the FW, for "Feather Weight". The engine was displayed at the Motor Show in London and attracted attention from the motor racing fraternity for its very high "
horsepower per pound of weight". With strong persuasions at the show including those by
Cyril Kieft (who had
Stirling Moss as a F3 driver) and a young
Colin Chapman, Lee concluded that success in competition could lead to more customers for the company and so the team designed the FWA, a Feather Weight engine for Automobiles.
The first Coventry Climax racing engine appeared at the
1954 24 Hours of Le Mans in the front of one of two
Kieft 1100 sports racers, but both cars (one with an
MG engine) failed to finish the race due to problems unrelated to the engines. The FWA became popular in sportscar racing and was followed by the Mark II and then by the FWB which had a capacity of nearly 1.5-litres. The new
Formula Two regulations suited the 1.5-litre engine and it quickly became the engine to have in F2 racing. The following year, the first Climax engines began to appear in
Formula One in the back of Cooper chassis.
Initially, these were FWBs but the FPF engine followed. Stirling Moss scored the company's first Formula One victory, in Argentina in 1958, using a 2-litre version of the engine. In general terms, however, the engines were not powerful enough to compete with the 2.5-litre machinery and it was not until the 2.5-litre version of the FPF arrived in 1959 that
Jack Brabham was able to win the world championship in a Cooper-Climax. At the same time, the company produced the FWE engine for
Lotus Elite and this enjoyed considerable success in
sports car racing, with a series of class wins at the Le Mans events in the early 1960s.
In 1961, there was a new 1.5-litre formula and the FPF engine was given a new lease on life, although the company began work on a V8 engine, designated the FWMV, and this began winning races in 1962 with
Jim Clark. There were a total of 22 Grand Prix victories before 1966 with crossplane, flatplane, two- and four-valve versions of the FWMV. When the new, 3-litre, formula was introduced, Coventry Climax decided not to build engines for the new formula and withdrew from racing after the unsuccessful FWMW project, with the exception of the new 2-Litre version of the FWMV.
Also in the early 1960s, Coventry Climax was approached by
Rootes to mass-produce FWMAs for use in a compact family car project called Apex with an all-aluminium alloy
over head cam engine combined with a full-
transaxle. This combination was considered very radical at the time, especially the syncromesh on all forward gears, which had been declared 'impossible' by
Alec Issigonis of BMC Mini fame. The adoption to mass-production was successful, and the project came out to the market as the 875cc
Hillman Imp totaling over 400,000 units made by 1976 including the later 998cc version.
Earls Court in 1962 Coventry Climax' chairman
Leonard Pelham Lee announced the withdrawal from building Formula 1 engines, stating that the company was losing money and not gaining enough publicity from their involvement.
 Nonetheless, Coventry Climax remained in Formula One until they were unable to come up with a new engine for the three-litre formula. The company was purchased by
Jaguar Cars in 1963, which itself merged with the
British Motor Corporation (BMC) in 1966 to form
British Motor Holdings (BMH).
In May, 1964, the
Royal Automobile Club presented the
Dewar Trophy, which is given at the recommendation of RAC's Technical and Engineering Committee for the most outstanding British achievement in the automotive field, to Leonard Pelham Lee. The citation reads: "Awarded to Coventry Climax Engines Ltd. for the design, development and production of engines which have brought British cars to the forefront in the field of Grand Prix racing."
The history of this trophy dates back to 1906. The last time the Dewar Trophy was awarded before 1964, the recipient was
Alec Issigonis for
British Motor Corporation (BMC) in 1959 on the design and production of the ADO15
Mini, who once was a junior engineer at Coventry Climax.
BMH merged with the
Leyland Motor Corporation in 1968 to form the
British Leyland Motor Corporation, which was then nationalised in 1975 as British Leyland (BL). Coventry Climax became part of the British Leyland Special Products Division, alongside
Aveling-Barford and others. At the end of 1978, BL brought together Coventry Climax Limited, Leyland Vehicles Limited (trucks, buses, and tractors), Alvis Limited (military vehicles) and
Self-Changing Gears Limited (heavy-duty transmissions), into a new group called BL Commercial Vehicles (BLCV) under managing director
In the early 1970s the fire pump business was sold back into private ownership, and the
Godiva Fire Pumps company was formed in
Warwick. In 1977 Coventry Climax acquired the Warrington forklift truck business of
Rubery Owen Conveyancer, renaming it Climax Conveyancer.
In 1982 BL sold off the Coventry Climax forklift truck business back into private ownership, to Coventry Climax Holdings Limited.
Sir Emmanuel Kaye, also chairman and a major shareholder of
Lansing Bagnall at the time, formed the company, independent of his other interests for the purpose of acquiring Coventry Climax.
In 1986 Coventry Climax went into receivership and was acquired by
Cronin Tubular. In 1990, a further change of ownership came with the engine business being sold to
Horstman Defence Systems of
Bath, Somerset, thus breaking the link with Coventry.
Kalmar Industries acquired the forklift truck interests of Coventry Climax in 1985. The company traded as "Kalmar Climax" for a few years, but is now trading as Kalmar Industries Ltd.