Rino Lacombe wrote:

Each exhaust ports scavenge the equivalent of 3 cylinders, at 5 000 rpm
the port must look like a torch with very little time between each
pulses.

Rino

This is the most plausible explanation I have seen so far. With a four
stroke piston engine the exhaust port is working only one fourth of the time.

Paul Lamar
 
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