Quote:
Originally Posted by Bicycle Bob
The crankcase of a single can be regarded as an air spring for the piston. It is pretty efficient at any pressure, but with lower windage losses when run at low pressure. To recover throttle plate losses, replace it with a turbine and bypass arrangement, or a variable pitch turbine.
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There is an old but very good discussion on this link:
http://www.eurospares.com/sucker.htm