Quote:
Originally Posted by NJ RTX
Based on maintaining properly, you can keep the unwanted dirt out of your engine, just as with any other filter.
No one would go through the hoops to only document red line cfm. The more important question would be to read the cfm difference at idle, mid range and full rpm between the stock filter, and then the K&N.
While I will agree there is good reading there, you cannot compare a diesel to a gas engine and expect anywhere near the same results.
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Three issuse...
#1 Unwanted dirt. I guess you didn't read the test I suggested. That is the point... an oiled gauze filter does not filter well, new, dirty or otherwise. It's an ineffective filter that should not be used for normal automotive use.
#2 I mentioned redline since that's the most likely place an aftermarket filter would make any difference. A filter that caused a difference at idle would not allow you to reach red line. Not to get too far off the subject... this is a valid subject for the aftermarket intakes which suffer at low / mid RPM due to low air velocity, but that's a different subject. I don't remember the CFM off the top of my head... I think I posted it a year or two ago, but I think it was around 320CFM at redline. The filter tested out at like 770CFM pulling minimal restriction (6" H2O). It was well over anything one could possibly use.
#3 It wouldn't matter if the engine were gasoline, diesel, propane, or even just a big vacuum cleaner. The filter, nor the dirt know what's sucking on them.