Honda RA300E/RA302E engine

The Honda RA300E and RA302E are 1 litre, four-cylinder, four-stroke, naturally aspirated racing engines that Honda designed, developed and built for Formula Two in 1965. Honda sought to build on its motorcycle racing success by entering four-wheeled motorsport in 1963; journalist Jabby Crombac passed the idea to Jack Brabham, who agreed a deal with Honda's Yoshio Nakamura to run Honda engines in Formula Two. The first engines produced 135 bhp at 10,000 rpm and were unsuccessful in a Brabham BT16, but the revised 150 bhp, 11,000 rpm engines in the Brabham BT18 let Brabham and Denny Hulme win twelve of thirteen events in 1966. Honda's Formula Two involvement ended when the 1967 rules raised the engine limit to 1600 cc.