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From: wwb@ihuxn.UUCP (Walt Barnes)
Newsgroups: net.auto
Subject: Re: help with camshafts and vacuum assist
Message-ID: <777@ihuxn.UUCP>
Date: Wed, 25-Jul-84 15:37:59 EDT
Article-I.D.: ihuxn.777
Posted: Wed Jul 25 15:37:59 1984
Date-Received: Fri, 27-Jul-84 05:00:27 EDT
References: <2739@decwrl.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 11

The key to your loss of vacuum is the overlap between exhaust valve
and intake value openings.  In addition to increased duration and
lift, wilder cams have more overlap.  Thus the incoming fuel mixture
helps push all the exhaust gas out.  Another advantage is the
increased turbulence in the combustion chamber further aids in
fuel/air mixture.  Oh yes, another point, if you add the intake
duration and exhaust duration you may get additional insight into
why the overlap increases for wild cams.

						Walt Barnes
						...!ihuxn!wwb