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Hi every one
I have some questions about my options for a modified ’73 Pontiac 455 with 11.5-1 compression I recently purchased. I’ve been using the 91 octane fuel from shell since it contains no ethanol as I’ve heard the rubber components in these older fuel systems will crack and deteriorate quicker with the use of ethanol fuels. Using this fuel I’m of course getting knock, ping, and dieseling (so I add a ton of octane boosters to a little bit of fuel…). I’ve been looking into the price of racing fuel up here in southern Ontario Canada… eh… and it looks like I’d be paying $75 for 5 gallons or $510 for 130 gallons for the basic 98 octane fuel and the prices increase with the octane from there. This is not ideal when this car sees a few thousand miles each summer driving to shows, friends, the strip and the beast gets roughly 9 miles per gallon…
But I’ve heard about mixing either jet fuel, or just variations of fuels used in planes with pump gas to satisfy high compression engines, and I was wondering if this was a good option, because I’ve also heard some of these fuels closely resemble diesel…? And if this is a reasonable option what type of these fuels is best?
Any advice would be greatly appreciated, maybe there is even another route I could go?
Thank you in advance, if any one can help me it will be EricTheCarGuy and his army of brilliant minds!
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With that compression, I would say alcohol!
Alcohol engines are designed to be high compression. That is where you get the bang for your buck in performance out of the lesser BTU’s. You also will have to change timing with it for the most performance. Gas has a problem with to quick of detonation therefore losing very valuable energy, and that is how ethanol or alcohol can stack up to it in a proper set engine.
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