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Originally Posted by Andy-Montreal
I couldn't help but notice how the aftermarket air filter seems to now draw warmer engine compartment air rather than cooler fresh air via the ram-air stock intake tube. I know that keeping the stock intake tube still brings air into the new enclosed K & N air chamber but there's now an indirect induction of air (transfer of air) taking place as compared to the factory setup where the induction is direct. Wouldn't this be considered power-robbing?
Back in the '70's during the mechanical fuel injection and carburetor days, Porsche used a pop-off valve on the intake tube between the air filter housing and the throttle body/carburetor. During an odd backfire, the pop-off valve would open preventing a large hole from blowing open in the air filter housing. My first guess was that this "p-trap looking" side-branch tube was some sort of "absorber" that would perform the same function.
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I agree with Andy. I am a mechanical engineer and I have always messed with these intakes on Import Tuner cars but not trucks. It seems as if the Ridgeline Stock intake is very well designed to allow for cold air intake.
Anyone have any comments on this issue?
I'll check with my cousin at Honda R&D Americas (he designed this intake; no, I'm not kidding) and see what he thinks about the K&N and AEM intakes).