Re: Air Intake, Exhaust
I found this on another site, it cracked me up.
Simple engineering calculations!
Each 11F air temp drop increases density by 1%, so measure the air flow temperature before and after a change to se how much you gained.
Air flow restiction can be easily measured with a manometer attached just in front of MAF. The absolute aymospheric pressure is 407 inches of water column at sealevel [29.92" HG].
Normal oem intake and air filter have ~~ 6-7" H2O of restriction as measured in front of MAF. So measure before and after. So a 4" improvement at peak rpm [4/27.7 = 0.1444 x 0.68 = ~ 1% improvement].
3 HP maximum improvement +- any temperature change improvement.
Most after market system actually increase temperature [measured at highway speed] so measuring temp is a must.
Reminds me of the old days when we used to flip the air cleaner lid over on the carb, made it sound like you had all kinds of power but actually was pulling in hotter air!
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