[Christ]

Originally Posted by stonebreaker

Sure, it's called the ideal gas law: pV=nRT. If temp drops or volume increases, then pressure must drop. Thus you are refuted by the laws of thermodynamics.

Head ports have nothing to do with cylindrical pipe flow - their shape is too complex to be directly comparable. However, just for S&G's, I'll point out that the typical gen I smallblock had 170cc intake ports and 67cc exhaust ports. The LS1 had 200cc intakes and 70cc exhausts. Now the LS3 has 257cc intakes and 86cc exhausts, gets better mileage, makes more power, and produces less pollution (12% less hydrocarbons and 40% less NOx) than the LS1.

Oh, and if we take YOUR suggestion to the extreme, since we seem to be going to extremes, when the exhaust hits the essentially infinite diameter at the end of the tailpipe, it should just stop and stack up, since it will expand and cool waaaaay more than it will in a larger pipe.

Thanks for making my point.