24-05-2010, 10:25 PM
In multi-valve engines, each cylinder has more than two valvesMulti-valve engines started life in 1912, adopted by a Peugeot GP racing car. It was briefly used by the pre-war Bentley and Bugatti. Honda S600 was probably the earliest production road-going 4-valve car. Most poppet valve, four-stroke internal combustion engines have at least two valves per cylinder