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From: rick@cadtec.UUCP (Rick Auricchio)
Newsgroups: net.auto,net.consumers
Subject: Re: No Leaded Gas -- Now What?
Message-ID: <36@cadtec.UUCP>
Date: Mon, 11-Mar-85 14:37:32 EST
Article-I.D.: cadtec.36
Posted: Mon Mar 11 14:37:32 1985
Date-Received: Tue, 19-Mar-85 04:33:53 EST
Reply-To: rick@cadtec.UUCP (Rick Auricchio)
Distribution: net
Organization: Cadtec Corp., San Jose CA
Lines: 36
Xref: watmath net.auto:6125 net.consumers:1994

gned for
80-octane leaded gas are now experiencing stuck exhaust valves, presumably
due to the limited availability of 80-avgas.  Most airports now have only
100/130 leaded or 100-Lowlead gas.  The 100/130 is slightly higher octane,
but has twice as much lead as 100-LL.

The old 80 had something like 0.5cc metallic lead/gallon, while 100LL has
2cc/gal, and 100/130 has 4cc/gal! (I think these are the figures; I'm 
more sure of the proportions rather than the actual number of cc's.)

Basically, the problem with older planes has been lead deposits on the
valves.  This is probably caused by the larger quantity of lead in the
newer gasolines, and by the lower combustion temp (or delayed burn) of
the air/fuel mixture.

My aircraft was designed to use either 100LL or 100/130; since the lead
is lower in 100LL (and that's all my home airport has), I use it.

When I fill up with 64 gallons of 100LL, I figure I'm carrying about
3.3 POUNDS of metallic lead! Some of that is bound to end up in my
already looney brain. I'll go for lower lead all the time, thanks.
=======================================================================
Opinions expressed above are my own; nobody else is foolish enough.
Rick Auricchio     Cadtec Corp.  2355 Old Oakland Rd, San Jose CA 95131
{decwrl!nsc,csi,onyx,teklds}!cadtec!rick	N1150G	 (408) 942-1535
	"This space available"