
Originally Posted by
Flip
Unless your motor is designed to run on leaded racing fuel, don't use it. The lead will kill your cat, your exhaust will run hot and its a waste of money.
To get the benefit from high octane fuel you need a high compression motor. The motor makers spend a fortune to insure their motors run as efficiently as possible on standard pump gas. The std pump fuel in NZ is pretty good stuff actually. Just try that 98 unleaded fuel from BP, they seem to think it might be worth a few more bhp in Ferrari or some other high end performance car.
+1
A higher octane rating just means that the fuel is less vulnerable to pre-ignition (aka knocking, detonation, pinging, etc.) than lower octane ratings. Unless you have a turbo or supercharger and are playing around with upping the boost pressure there's really no benefit in using avgas. People are mentioning high compression engines, and while that is true you won't have a high-compression engine unless you've modified a stock engine extensively.
As was said, it contains tetra-ethyl lead which is some nasty shit indeed. ...and not just because it will fuck your catalytic converter! The long term effect of this shit might yet turn out to be much much worse than what has been predicted. However, unless you are running a catalytic converter I can not see how leaded fuel would have any detrimental effect upon your engine - the lead should not dissociate from the fuel until it has been combusted and cars ran for ages on leaded fuel with no problems. However, that is my quick and dirty analysis and it may be wrong.
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