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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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<blockquote data-quote="ClassicBiker" data-source="post: 94777" data-attributes="member: 1632"><p>A quick look through the internet taught me a few of things.</p><p>1) The cost of downloading a true scientific paper on this subject is $50 an article.</p><p>2) Octane rating has squat to do with flame speed.</p><p>3) Flame speed is dependent on the mixture of the fuel.</p><p>4) Pump gas (80-90 octane) has flame speed of .34 ms @ stoichiometric combustion</p><p>5) Ethanol (102 octane) .39 ms @ stoichiometric and Methanol (103 octane) .43 @ stoichiometric.</p><p></p><p>So it would appear that the big brain chemists in attempting to make fuel burn cleaner and more efficiently have slowed the combustion process. So if max pressure is to be achieved at or just after TDC, so that the piston is driven down and not fighting to get to TDC, the process must begin later.</p><p>The fly in the ointment is finding out what the flame speed was of the mixture or the actual mixture itself of 1950 pump gasoline.</p><p>Steven</p><p></p><p><a href="http://www.whitfieldoil.com/171.284/vp-racing-fuel-" target="_blank">http://www.whitfieldoil.com/171.284/vp-racing-fuel-</a></p><p><a href="http://iqlearningsystems.com/ethanol/downloads/Racing%20Fuel%20Characteristics.pdf" target="_blank">http://iqlearningsystems.com/ethanol/downloads/Racing Fuel Characteristics.pdf</a></p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 94777, member: 1632"] A quick look through the internet taught me a few of things. 1) The cost of downloading a true scientific paper on this subject is $50 an article. 2) Octane rating has squat to do with flame speed. 3) Flame speed is dependent on the mixture of the fuel. 4) Pump gas (80-90 octane) has flame speed of .34 ms @ stoichiometric combustion 5) Ethanol (102 octane) .39 ms @ stoichiometric and Methanol (103 octane) .43 @ stoichiometric. So it would appear that the big brain chemists in attempting to make fuel burn cleaner and more efficiently have slowed the combustion process. So if max pressure is to be achieved at or just after TDC, so that the piston is driven down and not fighting to get to TDC, the process must begin later. The fly in the ointment is finding out what the flame speed was of the mixture or the actual mixture itself of 1950 pump gasoline. Steven [URL]http://www.whitfieldoil.com/171.284/vp-racing-fuel-[/URL] [URL]http://iqlearningsystems.com/ethanol/downloads/Racing%20Fuel%20Characteristics.pdf[/URL] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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