roadkill2

"WhatchootalkinaboutWillis?"

Heh, heh . . .

On Marks post. Altitude has some effects on hot n' cold . . We don't have a lot of air up here . . Where we race we're about 1500 feet lower than Mark but racing in 8500-9500 foot air is common in both places. We'll be up there weekend after next for the Super Chevy deal and we can count on just about two tenths off our dial at our home track, but the engine temperatures are generally the same. Of course, at those altitudes the boiling point of water is harder to achieve and it takes a little bit longer to gain temperature in an engine . . (A three minute egg is about a five minute egg at Bandimere's), but because of the thin air, it's also a little harder to cool off if you're just using air for your convection medium . . (High School Physics)

A cold intake provides for a denser mixture, which is very important when you don't have much air, and cold Fuel makes a difference (to a point) as long as it still vaporizes . .

The place where heat is needed is the cylinders and rings . . We all know cold leak down is greater than when an engine has heat in it . . and there's the rest of the engine that has to come to operating tolerances designed for running at 175-185°. Valve lash will affect your cam duration and lift, and there's other little things that don't fit quite as well cold as when hot . .

Just more grist for the mill . . . .