The Bentley Speed Six was a car model introduced in 1928 as a more sporting version of the Bentley 6½ Litre. It had a high-performance engine, two SU carburetors, and a single-port block for power.
Construction of the cars that won the 24 Hours of Le Mans in 1929 and 1930 used the Speed Six chassis.
An engine with a displacement of 6.6 liters straight six fueled the Bentley Speed Six. At 3500 rpm, the engine generated 180 horsepower (130 kW). The Speed Six had a 5.3:1 compression ratio and a high-performance camshaft.
In 1928, the Bentley Speed Six made its debut as a sportier variation of the Bentley 612 Litre.
The most successful racing Bentley of all time was the Speed Six factory racing specification. The race version's top speed was 125 mph (201 km/h), and it was adjusted to produce 200 horsepower at 3,500 rpm, which was a tremendous power output for the time.
With two straight victories in 1929 and 1930, Bentley established dominance over the first ten years of the 24 Hours of Le Mans with the race version of the Speed 6. A fantastic illustration of the design of the vehicle is the Speed Six tourer with its original body by coachbuilder Hooper.