All,
With a recent batch of middleweight parallel-twin motorcycle engines, has anyone tried to use one in an FSAE car?
Given that a 20mm restricted engine generally chokes around 10,500 RPM, and the peak power speed of most 600cc I-4 motorcycle engines is in the range of 12,500-14,000 RPM, the valve timing, valve size, and mean piston speed are not well matched to the restrictor.
Would an engine that was designed to operate below this choked flow RPM require less work to achieve the best balance of maximum power, minimum investment, minimum fuel consumption, and minimum weight?
While most of these engines are in the 650-700cc range, they are not far from the 610cc regulation. An engine could be modified by sleeving down the cylinder to reduce bore or welding the crankshaft to reduce the stroke.