[DMCForum] Re: Fuel requirements
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[DMCForum] Re: Fuel requirements



Then a lower octane like 87 or 89 is ok for DeLoreans because they 
only have a compression ratio of 8.8:1 in un-turbocharged format,

Right?

--- In DMCForum@xxxxxxxxxxxxxxx, "Andrei Cular" <acular@xxxx> wrote:
> 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@xxxx>
> 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:
> > > DMCForum-unsubscribe@xxxxxxxxxxxxxxx
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> > >
> >
> >
> >
> > -- 
> > Farrar Hudkins
> > Announcer/Producer
> > 89.9 WWNO FM New Orleans / 90.5 KTLN FM Thibodaux-Houma
> > Live audio stream @ www.wwno.org
> >
> >
> >
> > To unsubscribe from this group, send an email to:
> > DMCForum-unsubscribe@xxxxxxxxxxxxxxx
> >
> >
> >
> > Your use of Yahoo! Groups is subject to 
http://docs.yahoo.com/info/terms/
> >
> >



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