By 1951 , their 1.5 L supercharged engines could produce 425 bhp ( 317 kW ) at 9,300 rpm .
By 1951 , their 1.5 L supercharged engines could rev as high as 10,500 rpm .
By 1951 , their 1.5 L supercharged engines could produce 425 bhp ( 317 kW ) at 9,300 rpm , and could rev as high as 10,500 rpm .