Re: Avgas

Posted by Red4Life on July 07, 2005 at 16:40:26 from (65.87.147.109):

In Reply to: Avgas posted by On2Wheels on July 06, 2005 at 20:13:56:

Octane ratingings tell you at what compression the fuel will fire without a spark. The lower the rating the lower the compression, the higher the rating the higher the compression it takes to force the fuel into combustion with no spark. Octane has NO effect on engine horsepower. The only reason to switch to a higher octane fuel is when the carbon buildup on the head and/or piston causes the the compression of the cylinder to increase to the point that it causes the fuel to combust before the spark. This pre-mature combustion can and does occure before the cam closes the valves fully and will cause what is comonly called "SPARK KNOCK". Only when you hear spark knocking should you upgrade your octane ratting, and should consider cleaning the head. Again octane rattings do NOT represent potential Hp only money wasted in the stack.

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• Re: Avgas randy hall 17:36:10 07/07/05 (0)

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