Posted by JDEM on October 15, 2017 at 06:41:54 from (70.194.5.185):
In Reply to: KN air filters posted by Mtractor on October 14, 2017 at 18:12:47:
I've heard many claims for years like "I think it has more power, or "much better mileage." All nonsense as far as I can tell. Try to find even one verifiable example of a controlled test on a stock engine - with OEM intake and then aftermarket intake. I bet you will not find results anywhere of a K&N gaining anything, except making your wallet lighter.
Auto engineers do a lot of research and are not going to install an air intake or exhaust that results in worse efficiency.
I did CFM and volumetic efficiency calculations on many of my rigs. 1985 Ford F250 with a 6.9 diesel, 1983 Chevy with a 6.2 diesel. 1978 Toyota truck with a 2.2 gas engine, 1994 Ford F250 with a turbo 7.3 diesel, and 1988 Toyota truck with a 2.4 gas engine. ALL have more CFM allowance in the intake and exhaust then the engine can use - stock from the factory. Most exceed need by 10-15% when engine is at max power.
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