Date: Thu, 03 Feb 2005 00:23:31 +0000 From: Pooh Bear <rabbitsfriendsandrelationsnospamail.com> Subject: Re: Saab newbie
Valued Customer wrote: > Yes, a turbo charger is indeed a compressor... > > However, I still fail to see the logic in lower octane at altitude is > okay for naturally aspirated engines but not for turbo charged ones > (suggested by Zon and I guess now Graham). Actually I was referring only to the pressure boost that turbos provide. > Octane is a measurement of how high the ignition point of gasoline > is... nothing more. Altitude is not an "excuse" to use lower octane. > I'm not a refiner but I doubt octane is directly related to the cost > of refining the oil. Actually it is. When you refine oil you get so-called 'fractions' of various octane values. The higher octanes are partly limited by the kind of oil being processed ( light sweet vs heavy crude for example ) but typically attract a premium price due to market demand. Graham