Octane has nothing to do with causing a motor to run leaner or richerit became too rich (more octane) and sputtered.
Race fuel has many benifits other than octane.A motor ran with the correct fuel will run cleaner,have better response, be more conssistent, produce more power(through o2 compounds).You are correct and it is a fact that low compression engines do not *need* high-octane fuel
Originally posted by DKT735
From my perspective, if your trying to get the last 20% of performance out of your bike and yourself, race gas is worth it.
This is absolutely wrong. There is more to race gas than just octane. The improved response and consistant jetting far outweigh the small benefits of higher octane. Also, the octane has nothing to do with the "explosiveness" of the fuel. The fuel isn't supposed to "explode" in your engine, it is supposed to burn smoothly. When the fuel "explodes", it is called pre-ignition, pinging, or detonation, and is an engine-killer. And if you think running low-octane fuel won't hurt your engine, go ahead and put a fresh top-end in your bike, jet it really sharp, and go ride a few hard, fast laps. When you are pushing your bike back to the truck with a hole melted in the top of the piston from the detonation that resulted from the inadequate octane, you might just change your mind.Originally posted by jadair
Theres no advantage unless you have the timming or the compression to run it. If you dont have the compression or timming it might help you a little bit to run low test because it more explosive and it wont hurt anything in your motor.
Originally posted by reynome
A few of us run Phillips B35, which is 101 octane with 2.5% MTBE, .
My reply was in the context of this post being about the benefits of race gas for average riders, who usually ride bikes that don't need the higher octane of the race gas. In that context, the higher octane versus premium pump gas is of little importance, but the other benefits are real. However, running too low octane, like 87 in a dirt bike engine in which the majority need 92-93 at least, the lower octane is a real problem. 110 octane in an engine that only needs 93 is a waste and has no advantages.Originally posted by motopuffs
Uh, I'm confused Spanky..."small benefits of higher octane"? You proceeded to talk about holes in pistons...I'd say the higher octane is a big benefit.
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