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These motors were originally designed to run on Avgas. Is it possible that they can run on 98 octane and if so, what modifications may be required.
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If designed to run on Avgas, run it on Avgas. Your local airport fuel farm will be happy to tank you up with Avgas 100 ll. Don't know New Zealand pricing, but my airport sells Avgas for about $7 US per gallon.carpetbagger -
I want to run this motor in Formula 2 which only allows 98 octane. The 2 litre is no longer that competitive in Formula 1 as they now run 2.5 litre engines.Comment
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Someone correct me if I'm wrong, but if one were to run 98 octane in an engine designed for Avgas (100 ll), could this difference in detonation be made up for with spark plug selection? Also, is a -2 octane difference going to mean that the engine will not perform the way it was designed to?28-RComment
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Contact Mercury? Unless customer service has totally tanked, Mercury should have a tech-mech available to address the problem and offer solutions.
As HydroKyle mentioned, a 2 point ding on octane probably won't affect it that much. Might require a tiny timing adjustment.carpetbaggerComment
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If the octane difference was on 2 points you might be able to just back off on the timing and get away with it, but that's not the case. Auto gas is an average of the research and motor methods of measuring octane. Avgas is rated on the motor method. The reality is that auto gas isn't even close to 100LL in octane. It's a bit better than 80 octane avgas, but the difference in octane is more than can be accomodated by just cranking back the timing. Auto gas is closer to 85 octane on the motor method... bottom line is that you probably need to lower the compression ratio to keep the engine from detonating...Originally posted by HydroKyle93R View Post
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