![]() Oh, someday I'll have a local shop go through this motor for me. I've figured as long as the compression is low, I'll take advantage by using mid-grade gas - and it runs fine. In the case of my motor, which is a LONG story, the compression actually measures low. A higher-compression engine requires a higher-octane gas, as the octane is a retardant that reduces the tendency to pre-ignite. That's what sounds like marbles inside the motor. When the air/gas mixture is heavily compressed, it gets really hot, and it ignites before the spark plug fires. The tradeoff is the tendency to "pre-ignite". ![]() But one major way to increase power is to increase the motor's compression. Gas is gas, it's the motor that gives you good or weak performance. After all, we remember TV commercials that make you think that THEIR high-test gas gives you more horsepower, or better mileage, or something. The knock is a sign of burning too quickly, and octane needs to be raised to prevent it.Ī lot of people have trouble understanding what high grade gas actually is. On occasion I've accidentally put in regular, and it runs fine - but if I nail it I get a small amount of knock. Someday I plan to have it rebuilt properly, but for now I'm using mid-grade gas with no problems whatsoever. In my case, I've got a rebuilt motor with a blow-by problem and compression is low. They're old anyway, but the old-style rubber can break down slowly with the newer formulated gas-ethanol. You might also consider replacing any rubber hoses in the fuel line. Then, if the motor gets rebuilt, it will most likely get hardened valve seats - end of problem. ![]() Easy casual driving, such as to and from car shows, makes no difference. Basically if you plan on hard driving through mountains, or pull trailers frequently, you might want to find some lead to put in there. Remember, Amoco had, and heavily advertised, unleaded gasoline back in the 1960's and people used it without hesitation. The 91 octane would be fine.Īs for lead, I think that's a bit overrated. I think the book will tell you 100 octane, but that's by an old standard. ![]()
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