Re: [DMCForum] Fuel requirements

["Andrei Cular" <acular@xxxxxxxxxxxxxxx>]

That would be wrong information.  I have to run 91 in my 944 and it is
only
a 4 cylinder, but has a 10.9 to 1 compression ratio.  Octane has to do
with
how easy the gas would auto-ignite (think diesel), and this is what causes
knock or ping (pre ignition).  And it will destroy an engine very quickly.
Remember just cause you don't hear the ping doesn't mean it isn't
hammering
away at the internals of your engine.

If you want a general rule to go by, the higher the compression ratio the
higher the octane.  Or if you have a low compression ratio turbo charged
engine, the more boost the higher the octane.


Andrei




----- Original Message ----- 
From: "Farrar Hudkins" <fhudkins@xxxxxxx>
To: <DMCForum@xxxxxxxxxxxxxxx>
Sent: Tuesday, August 19, 2003 1:31 PM
Subject: Re: [DMCForum] Fuel requirements


> I was told a rule of thumb by my old mechanic that 87 octane is good
> enough for four cylinders, 89 for six, and 93 for eight cylinders.
> That's probably wrong, though, so I'd like some clarification. However,
> I've used 89 Octane fuel in all my six-cylinder engines after trying
> both ends of the spectrum and believe that it's a good match for fuel
> economy and efficient burning.
>
> Off-topic note: Happy birthday to Gene Roddenberry, author of the most
> famous split infinitive of all time. ;)
>
> Farrar
>
> cruznmd wrote:
> > Do you guys all really put 93 octane in your cars, or have you found
> > that it doesn't really matter?
> >
> > The manual says "91 octane only" but all the pumps in my area only
> > sell 87, 89, & 93 octane. I would think that 89 would be close enough
> > but.....
> >
> > Anyone notice any adverse performance or mileage from the lower
> > octane fuels?
> >
> > Rich
> >
> >
> >
> > To unsubscribe from this group, send an email to:
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> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
>
>
>
> -- 
> Farrar Hudkins
> Announcer/Producer
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>
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