Performance prize in 1957, three engines were made for this purpose, and they won the prize. Lotus also campaigned the FWC at Le Mans in 1958. The FWE powered Lotus Elites won their class six times and the Index of Thermal Efficiency once during the 24 Hours of Le Mans. The FW series engines in modified forms also powered Lotus Eleven cars which took three class wins at Le Mans and one Index of Performance win. In 1966–67, Fisher-Pierce of America imported an 85 hp version of the FWB with twin-carburetors to be mounted vertically in their outboard marine unit. This boat engine came out to the market as Bearcat 85. FPE (the 'Godiva') Commission Sportive Internationale announced in 1952 that 2.5L naturally aspirated engines would be a part of Formula One regulation starting 1954. Walter Hassan and especially Harry Mundy having their roots deeply in the racing field, started discussions and preliminary designs of a 2.5L 8 Cylinder GP engine in 1952 without a formal directive from the father and son Pelham Lees. Because this project was a pure racing engine from the beginning, which was in stark contrast to the corporate product history up to FWA, the engine was named FPE for Fire Pump Engine (Eight according to another lore) by the playful minds of Hassan and Mundy. After the corporate blessing was given to the project with the name 'Godiva', this DOHC, 90-degree, steel crossplane crank V8 engine was built in 1954 for an F1 Kieft with the intention to use the fuel injection system made by Skinners Union (SU). However, this fuel injection system, is designed for aeroplane engines, was found not to have the means to enrich the mixture for acceleration, which is not suitable for automobile use. FPE initially showed 240 bhp using Weber carburettors, but the press at the time reported the rumoured fuel-injected Mercedes 2.5L GP engine is quoted as producing more than 300 bhp, and a corporate decision was made not to release FPE to Kieft in light of the lack of proper fuel injection, leaving the Kieft F1 project, as well as other prospective users, HWM and Connaught, high and dry. There were reports to the effect that the engine was not run because of fears about the rumoured power of other 2.5L GP engines, but shortly after, John Cooper brought a race-winning, works Maserati F1 engine he had on