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I heard a horrible rumor that aviation fuel is not good for cars. The octane ratio is computed differently (noy and RON standard), so the computations don't cross apply. I remeber reading somewhere that 100 octane aviation fuel is actually equivalent to auto fuel of a low 80's octane. Be careful, I'd cry if we lost another one of our type 3 brethren to misinformation. Kenik Hassel 71 fastback On Tue, 23 Sep 1997 Sppinner@aol.com wrote: > > You can't make adjustments since the lead in the fuel was used to increase > > > the > > octane of the fuel and as a lubricant/cushion for the valves. > > I have been using leaded aviation fuel (100 octane) in my '63 notch and '56 > oval. Has anyone heard of a good reason NOT to do this ? It is called 100LL, > i.e. 100oct Low Lead. Being low lead doesn't mean it has less lead than > leaded auto fuel though. As a matter of fact, it has more lead than non-low > lead avgas, like 80oct. I usually mix it with 93oct auto gas like > 70%avgas/30% 93oct autogas. Am I going to cause any damage by this ? I > wouldn' t think so. I asked a guy who used to mix race fuel for us and he > joking said it'll fly (hehehe). The timing is set 10'BTDC, and it seems to > love it. > > kevin chapman > '63 jet-fueled notch >