[Diy_efi] RE: Timing Advance Curve?

[Ken Young]

And why such an engine, which cannot take advantage of the higher
auto-ignition through use of a knock sensor and advanced timing maps, may
actually *LOSE* power with higher octane fuel than it was designed for.
Lower octane fuels burn quicker and can release more power than higher
octane fuels, but the limiting factor is the knock limit (auto-ignition
temp).

Ken Young

>Octane has everything to do with the speed of burn.  Higher octane actually
>controls ping by slowing down the burn.  This is why a very low HP/cubic
>inch engine doesn't necessarily gain power with higher octane.

>>Huh ?
>>
>>WHat has octane to do with the speed of the fuel burn ?
>>
>>Isnt octane a measure of the fuels ability to resist knocking ?
>>
>>Mike

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