Thanks for the info, I ran 115/145 octane purple avgas in my 62 Plymouth 318
L, 3 deuces for carburation without problem.
Jim Knox, 91 Dak 318 LA
----- Original Message -----
From: "Pindell, Timothy" <TPindell@OTTERBEIN.EDU>
To: <dml@dakota-truck.net>
Sent: Friday, February 20, 2004 8:24 AM
Subject: Re: DML: more power an better mileage???
>
> Points well taken Jon.
> Check out these links on avgas vs. mogas:
> http://www.osbornauto.com/racing/race2avgas.htm
> http://www.airbp.com/airbp/public/fuels/premium.html
>
> on 2/19/04 8:06 AM, Pindell, Timothy at TPindell@OTTERBEIN.EDU wrote:
>
> > When I was a private pilot student at THE Ohio State University, there
> would
> > regularly several people per day coming in for avgas for racing during
the
> > summer. It's cheaper than the 76 or Sunoco at the track. Keep in mind
> that
> > it's leaded, 100/130 octane (depending on the test they use), and it's
> > tinted blue. You don't want to use the pink stuff. It's 80 octane and
> > rarely used in modern engines.
>
> >You don't want to use avgas in an automobile engine. Especially one
driven
> >on the street. One, the vapor point is different. It is designed for an
> >engine that is run at low rpm, and at a constant rpm at that. Auto
engines
> >need easy starting at all temps, high vapor point to prevent vapor lock,
> and
> >an auto engine varies rpm over a much wider range and runs at higher rpm.
> >It needs to burn quickly enough at high rpm, yet have high anti-knock
> >capabilities. Aircraft engines turn a steady 2400 rpm, rev slowly and
have
> >maybe 8.5:1 compression. Avgas is designed to run clean in these
> conditions.
> >It can't operate properly in auto engines with compression ratios
exceeding
> >11:1 and running 3x the rpm. Plus, in aviation engines the a/f mixture is
> >adjustable. Avgas has a different specific gravity and will not meter the
> >same in auto fuel systems.
> >Plus 100/130 avgas is LEADED.
> >Want high perf auto fuel? Buy it.
> >And I deal with 800 hp racing engines. You will make more power, more
> >reliably in an auto engine with mogas.
> >Now, the 80 octane IS mogas, but it is also leaded, and your aircraft
must
> >be certificated to be run on such.
> >Plainly stated, avgas is not designed to be run in auto engines.
> >
> >A few cents saved on fuel can cost many dollars in engine repair later.
> >
> >
> >Jon
> >STL MO
>
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