[Diy_efi] Venturi effect crankcase breather

[Matt Porritt]

My GOD!
Its Harley Davidson.. If its not a load of bollox then they spend WAY too
much time on R&D and never put it to production! :)

On 9/7/03 3:53 PM Adam Wade wrote

> I spoke recently with a drivetrain engineer at Harley
> Davidson on this subject.  He said the primary
> advantages from such a setup were a decrease in
> aeration (foaming) of the oil, due to lower crankcase
> pressure, and a decrease in air pumping losses
> incurred by moving a mass of air from place to place
> by the motion of the pistons.  Lowering the density
> lowers the pumping losses INSIDE the engine.  Ring
> seal is a tricky one, because according to the tests
> done by Harley, the optimal crankcase pressure for
> ring sealing is in a fairly narrow band not too far
> from atmospheric; in other words, it is easy to overdo
> it and cause issues with the ring seal, and ring life.


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