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ChadS
07-31-2003 13:53:23
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Re: Re: what fuel to use on 12:1 compression on su in reply to t-rex, 07-31-2003 11:06:42
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I would be afraid to see an 88 with a very large engine on alcohol. That would be one powerful ride! My opinon on fuel is finding the right fuel for your engine. Some engines run good on racing fuel, some don't. C-14 is a good starting base fuel for pulling engines. It makes more power as the rpms increase. One of the biggest problems on high compression engines is detonation, and preignition. Detonation occurs when the air fuel mixture continues to burn after the cyl fires, instead of one complete burn cycle. This usually happens when you have a low grade fuel. Preignition is a harder condition to detect. It will sound like its pinging. This is due to improper ingition timing, valve lash, or too hot of fuel. Too hot of fuel means that it is too explosive for the compression, it ignites in the cyl before the timed spark from the plugs. You can play with the timing alot, but it just sometimes never completly goes away. I look for a slower burning fuel in a lower rpm engine. (under 3000) Alcohol is the best slow burning fuel there is. The next best fuel I have found is a mixture. Of a 94 octane premium gas and ethanol. 50-50 mix. It has a high octane rating (around 108) and it is a slow burning fuel as well. I have dynoed several fuels in pulling engines, like C12,16,18VP, Turbo Blue, just to name a few, I have not found anything better than the gas/ethanol mix, for controlling preignition, detonation, and making great HP. Just my opinion, hope this helps ChadS
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