The DFV with 410 horsepower did not produce as much power as some of its rival 12-cylinder engines . It was lighter , resulting in a better power to weight ratio . Although the DFV ( bore : 3.373 i , stroke : 2.555 i , displacement : 2992.98 c ) with 410 b at 9,000 rpm did not produce as much power as some of its rival 12-cylinder engines , it was lighter , resulting in a better power to weight ratio .