Mazda RX500
Powered by an upgraded two-rotor 10A engine located centrally for perfect weight distribution, the tiny 982cc rotary produced 250ps and revved to 15,000rpm – higher than the grand prix cars of the period. With a fibreglass-reinforced plastic body on a tube frame, the RX500 weighs just 850kg resulting in a power-to-weight ratio of 3.4kg per horsepower.