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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