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FJR Motorcycle Forums
FJR Specific Discussion
85 Octane in The FJR
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<blockquote data-quote="BackintheSaddle" data-source="post: 1067944" data-attributes="member: 19864"><p>There was a magazine article (possibly Hot Rod?) a number of years ago where they ran track laps in the same car with regular and "high octane" fuel. The car was not equipped with engine managment systems that could adjust timing on teh fly. They left all the timing, fuel, etc the same and the car was slower around the track on the high-test. The conclusion was the slower flame propagation due to the "anti-knock" charateristics cost the engine a few horsepower. You need more advance to get the combustion started earlier in teh stroke in order to get it completed (near completed) before the bottom of the stroke and the exhaust valve opening.</p><p></p><p>The modern cars with dual ratings (SHO is another) take advantage of the fuel charateristics by letting the ECM to push all the parameters to the maximum unless the knock sensor says "whoa."</p></blockquote><p></p>
[QUOTE="BackintheSaddle, post: 1067944, member: 19864"] There was a magazine article (possibly Hot Rod?) a number of years ago where they ran track laps in the same car with regular and "high octane" fuel. The car was not equipped with engine managment systems that could adjust timing on teh fly. They left all the timing, fuel, etc the same and the car was slower around the track on the high-test. The conclusion was the slower flame propagation due to the "anti-knock" charateristics cost the engine a few horsepower. You need more advance to get the combustion started earlier in teh stroke in order to get it completed (near completed) before the bottom of the stroke and the exhaust valve opening. The modern cars with dual ratings (SHO is another) take advantage of the fuel charateristics by letting the ECM to push all the parameters to the maximum unless the knock sensor says "whoa." [/QUOTE]
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FJR Motorcycle Forums
FJR Specific Discussion
85 Octane in The FJR
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