volumetric efficiency

[atsakiri at ford.com]

> How can vol. eff. be greater than 1?

A non-boosted engine can still have a volumetric efficiency
greater than one.  A highly tuned induction system can produce
manifold pressure pulsations (at some engine speeds) which
are higher than ambient pressure and which occur when 
the intake valve is open.  Since volumetric efficiency is usually 
calculated using ambient pressure as the reference, the result 
ends up being greater than one.

It's possible, but I don't think common.


Anthony Tsakiris

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The opinions expressed are my own and not necessarily those of my employer.