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Old Oct 27, 2012, 11:01 AM
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I HATE GLOW PLUGS!
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United States, NY, St Lawrence
Joined Feb 2012
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Could the engine be making more power when below operating temperture be due to a rich mixture being more suited to the cooler operating temperture?

Not saying that you should neccessarily lean out the mixture for more power @ normal (higher) operating temperatures, rather that you not be overly concerned.

Power loss can also be attributed to a higher intake charge temperture (less dense intake charge) as the engine compartment temperture heats up the induction components. (carburetor, manifold, port runner, etc)

While drag racing @ high temeprtures in Ohio, I once experinecd a .45 second ET reduction just by icing down the intake manifold & getting ECT @ staging down to 156*F from 179*F on the previous pass..

The point is, that a hot induction system can significantly reduce power output.
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