How can you have some extra power with PCV valve

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PJL said:
To use really high rpm it really helps to have a vacuum to minimise drag. I remember when working in a lab that one day the vacuum pump on the centrifuge failed. The rotor, which was simply a smooth titanium block (once capped), would not spin above about 15000 rpm; it would normally go to 50000. It cooked my samples due to the heat.

Now imagine a non-aerodynamic crank - much resistance, much heat. Racing engines, especially F1 and Moto GP, now run up to 18000 rpm or so. 1960's Honda's used to go to 25000 rpm! Running in a partial vacuum would really help.

Best regards, Phil.
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GP bike's, F1 and 1960's Honda's are not vertical twins, on this multi cylinders, let say a four cylinder, the two pistons in the compression stroke create the vacum for the two others
Cheers yves
 
You are correct, and on a four cylinder a reed valve does no good. But a vacuum pump will remove some air and cut down on air drag. Tiny gain, but in racing every little bit is worth whatever it takes. Jim
 
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