Forum Discussion
toprudder
Jul 19, 2006Explorer
I'm not sure the anti-detonation qualities are the reason why higher octane fuels don't work well in small engines.
Although I've flown model airplane for many years, I just recently started running a gasoline-ignition engine. As a result, I've investigated the use of different fuels and oils.
The instructions for the engine I have recommends 95 octane. I can't find 95 octane at the pumps. I ended up buying 100 LL at the local airport. It smells less than auto gas, and someone told me it has less vapor pressure, which makes sense for aviation fuel. (Might also make it harder to start) Others swear by using Coleman lantern fluid, which is supposed to be very low octane. From what I have been able to find out, the smaller the engines, the less picky they are about octane ratings. Detonation apparently is more of a problem in larger bore engines.
One engine manufacturer told me NOT to use aviation fuel. I asked why, and all he said was that it has lead. I don't know, but leaded fuel seemed to run fine in everything 30 years ago.
Then what oil to use. Amsoil, Belray, Mobil 1, Yamalube, Penzoil. Holy cow, I don't want to get started on THAT topic here!!! :)
Although I've flown model airplane for many years, I just recently started running a gasoline-ignition engine. As a result, I've investigated the use of different fuels and oils.
The instructions for the engine I have recommends 95 octane. I can't find 95 octane at the pumps. I ended up buying 100 LL at the local airport. It smells less than auto gas, and someone told me it has less vapor pressure, which makes sense for aviation fuel. (Might also make it harder to start) Others swear by using Coleman lantern fluid, which is supposed to be very low octane. From what I have been able to find out, the smaller the engines, the less picky they are about octane ratings. Detonation apparently is more of a problem in larger bore engines.
One engine manufacturer told me NOT to use aviation fuel. I asked why, and all he said was that it has lead. I don't know, but leaded fuel seemed to run fine in everything 30 years ago.
Then what oil to use. Amsoil, Belray, Mobil 1, Yamalube, Penzoil. Holy cow, I don't want to get started on THAT topic here!!! :)
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