[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
With my aircooled aircraft mechanics hat on I fully concur with Jim. Take the octane number on the pump as directly related to flashpoint. The lower the number, eg 87, the lower the temperature and/or pressure the fuel will spontaneously ignite. That's why we flyguys use 100/130 & occasionally 140 octane fuel. Actually it's usually not even the octane content that is referred to with the number. It used to be but it's more efficiently done by other chemicals now. Pumps by us here in no-VW-show-country (Indiana) declare the number on the pump to be an anti-knock rating rather than the popular octane nomenclature. Mike Geurink > > lower-octane fuel burns *hotter*. > > JimA=> Not true. > > OK, tell me where I get off track: > > Octane is added to fuel to slow down the burn. Right here. Higher octane gas does not burn any slower or faster than low octane gas. A high octane rating just means that the fuel is less likely to combust spontaneously under compression (dieseling.) This just allows the combustion to be controlled by the spark rather than by the somewhat random influences of knock. Jim ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org