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> 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? > Not sure - humid air just contains more water vapour - it's already done its evaporative cooling. It's also a lower density than dry air at the same temp - you certainly get better engine performance with cool dry air, for one reason or another; higher oxygen content for dry air, and more air/fuel mixture when air is more dense. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org