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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!wookie
From: wookie@alice.UUCP
Newsgroups: net.auto
Subject: Re: Leaded gas and old engines vs. new engines
Message-ID: <2911@alice.UUCP>
Date: Tue, 10-Jul-84 14:03:37 EDT
Article-I.D.: alice.2911
Posted: Tue Jul 10 14:03:37 1984
Date-Received: Wed, 11-Jul-84 01:16:35 EDT
References: <1573@sdccs6.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 17

The newer engines use harder valve seat material to prevent
wear which used to be prevented by the lead in the fuel.  One
way to fix the problem is to get heads from a newer engine of
the same type which will have the hard seats.  A side benefit
of this is often a reduction in compression ratio which will
lessen detonation in the old high compression engines..  You
could wait until the engine needs a valve job and either have
hard seats installed in the old heads or go to the junk yard,
pick up a newer set of heads and have them rebuilt instead.

It's interesting that back when they proposed putting lead in
the gas in the first place, one of the big controversies was
how it would affect valve life and leave big deposits on the
valves.  So here we are going the other way!

				Keith Bauer
				White Tiger Racing