Technical > Spud Miller's Cave

Enderle barrel valve adjustment question

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dreracecar:
If the idle rpm does not rise when you close off the shut off you need to turn it some more. I have to go about 1/2 way to get rise in rpm.  Alc is a heat and compression sensitive fuel, when the engine is cold the fuel will ignite closer to TDC because the magneto has a long spark duration to cover that range and being closer to TDC gives you more compression. When heat is introduced that ignition point gets further away for TDC and starts to make power at the beginning of the magneto spark. Leaning on the shutoff trims away the excess fuel that is now being used to cool a cold engine. You have up to 240* of temp before you have problems.

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