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Date: Thu, 26 Oct 2000 13:46:54 -0700
From: Robert Blumberg <>
Subject: Re: 16 Valve engine question

Matthew Crump wrote: > ... I've read somewhere that 16v engines should be revved harder than ... I don't know about "should be," perhaps "may be able to be" is a better phrase. One of the gains that you get from doubling the number of valves is that each is a bit smaller and so each valve has a lower mass resulting in a lower inertia. Given the same camshaft cut, and same spring rates, the lighter valves can follow the camshaft better at higher revs by having less float. However, on doubling the number of valves the engineers probably also modified the camshaft cut and the spring rates, etc., etc. I'd check with the manual for recommendations and try to neither lug the engine nor over-rev it -- unless you care to rebuild the engine sooner for the gain of a macho like destruction of your engine. It is fun however to wind it up on occasion -- I like fool myself into thinking that I'm cleaning the carbon out -- whatever. Rob't

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