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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: 94789" data-attributes="member: 1632"><p>I think it's a balancing act between several variables. Flame speed is slower but resistance to detonation is increased. Out of curiosity I tried to extrapolate the flame speed of E-30 pdf file I listed from the pure ethanol and pure gas flame speeds. (.3x.39)+(.7x.34) and got .355 to the .36 listed. So the flame speed has been slowed down.</p><p>Now if we look at the octane rating pure gas is 80-90, ethanol is 102, and E-30 87-94. Ethanol is less likely to detonate from compression than pure gas. The middle ground of E-30 is just a hair above the best of pure gas.</p><p>The higher the actual pressure before ignition the more the power released and more efficient the burn. So while the burn is slower the resistance to detonation is increased allowing the process to begin later and therefore release more power in a more efficient manner.</p><p>But if the process is initiated too early the rise in pressure due to early ignition may cause the pressure to rise to fast and cause detonation.</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 94789, member: 1632"] I think it's a balancing act between several variables. Flame speed is slower but resistance to detonation is increased. Out of curiosity I tried to extrapolate the flame speed of E-30 pdf file I listed from the pure ethanol and pure gas flame speeds. (.3x.39)+(.7x.34) and got .355 to the .36 listed. So the flame speed has been slowed down. Now if we look at the octane rating pure gas is 80-90, ethanol is 102, and E-30 87-94. Ethanol is less likely to detonate from compression than pure gas. The middle ground of E-30 is just a hair above the best of pure gas. The higher the actual pressure before ignition the more the power released and more efficient the burn. So while the burn is slower the resistance to detonation is increased allowing the process to begin later and therefore release more power in a more efficient manner. But if the process is initiated too early the rise in pressure due to early ignition may cause the pressure to rise to fast and cause detonation. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern Fuel & Ignition Advance
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