probably. But CR is just one factor, you also have to look at engine temps and load conditions. Anyone have an owners manual handy? What is the octane rating system it has in it? Andrei ----- Original Message ----- From: "cruznmd" <racuti1@xxxxxxxxxxxx> To: <DMCForum@xxxxxxxxxxxxxxx> Sent: Tuesday, August 19, 2003 1:54 PM Subject: [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/ > > > > > > > > > > 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/ > > Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=244522.3707890.4968055.1261774/D=egroupweb/S=170512 6215:HM/A=1595054/R=0/SIG=124ukap9t/*http://ashnin.com/clk/muryutaitakenat togyo?YH=3707890&yhad=1595054> Click Here! <http://us.adserver.yahoo.com/l?M=244522.3707890.4968055.1261774/D=egroupm ail/S=:HM/A=1595054/rand=209657061> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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