That the average gasoline-fuelled race engine is no more than about 28% efficient is a source of great angst to many power unit engineers. But while the best will claim 37-38% and the worst nearer 20%, the inescapable fact still remains that the vast majority of energy available from the fuel is lost in the form of heat. Split evenly between heat in the exhaust gas and that delivered up to the cooling water jacket, that means for a 450 kW race engine somewhere in the region of 500 kW of...