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Interesting... another reason why my gas mileage seems to wander somewhat. Keith > 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 > >