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Hello- > > On the flip side, at equal temperatures, I suspect that our > > engines cool better in the greater humidity due to heat capacity issues > > from the water in the air. No? One thing for sure: carbureted or open-loop fuel injected (i.e. D-Jet) engines will run richer when it is really humid. This is because part of the air that is metered isn't air, but rather water vapor. You may at first think this effect is small and negligible, but if you go through and figure out the partial pressures of water vapor at various conditions, you realize that it isn't. In fact, it's even a factor used to determine dyno correction factors... Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.lnengineering.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org