Coolant modifications
As I read this thread several things spring to mind. Vizard said the unheated intake was the one with the worst gas mileage while it appears it had the best HP gains. I wonder if in fact this might be due to the gas itself being cooler in the bowls. In the north the gas companies compensate for contraction under 10 or 15 Celsius. This was done in large part to them pumping more gas and getting paid for less because the atoms in the gas were packed tighter due to temperature. Now could there be a direct variation in the added power in the gas and the lower volume because of this. Ed
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