Proof that K&N sucks at filtering air
#29
Rotary Freak
iTrader: (5)
To quote that " .Does it flow better? At very high airflow volumes, probably. BUT, our engines CAN'T flow that much air unless super-modified, so what is the point? " .. remember boosted engines are dependant on that flow for power . on an NA engine maybe this statement is true . to a point. I just took my engine apart .. and it was not dirty .. I've taken my intercooler piping out countless times and its been quite clean .
I have an apexi intake .
I have an apexi intake .
#31
Recovering Miataholic
Originally Posted by wstrohm
... It's worse than that...
... It's worse than that...
That bulletin came out in 1995. There was very little development in the aftermarket place for the FD at the time. However, their "claim" was the hot air, not dirty air was killing the airpumps.
#34
needs more track time...
iTrader: (13)
And to your second point, flow rate depends on both the porosity of the filter and the area of the filter. A large area filter with low porosity can flow as much as a smaller area filter with high porosity. So it is possible with different filter designs to have high flow without extra particulate.
I have never heard of an FD engine failure (or damage) due to using a K&N filter.
There have been many anecdotal statements from users on this forum that intakes using K&Ns are found to be "dusty" or "gritty". And several times, in different threads, I've read the suggestion to put a dab of grease on the inside of the intake, and test it after a couple of weeks. If you ran this experiment, and the grease was gritty, would you think your engine was going to last as long as it would otherwise?
#35
OEM airbox with OEM paper filter and a modified cold air intake hole in the plastic garnish snorkel panel above the airbox (with the intercooler duct blocked off to be its own intake) is how I run mine.
Basically copies how the 99-2002 cars left the factory. Eliminates hot intercooler air feeding into the airbox, and both the airbox and intercooler get their own source of cold air separately from the front of the car, using all stock plastics, looks 100% stock.
Basically copies how the 99-2002 cars left the factory. Eliminates hot intercooler air feeding into the airbox, and both the airbox and intercooler get their own source of cold air separately from the front of the car, using all stock plastics, looks 100% stock.
#36
Mr. Links
iTrader: (1)
These engine fail far sooner for various other reasons than what some extra dust particles are ever going to do.. Unless you turn your car into a Baja contender, it's not an issue. It's just a marketing ploy for different companies to get you to spend money on their products. If it were really proven to kill motors, (rotary or not), there wouldn't be a single aftermarket air filter available as no one would be buying them.
#43
Rotary Enthusiast
iTrader: (5)
Ya there was a engine failure from detonation but we were discussing whether all the wear/grooves in the rotor housings and loss of compression was from a water injector issue I had and not enough premix, or from ALS seals, and I've been wondering if it might also be from the air filter.
#44
needs more track time...
iTrader: (13)
a) We all seem to agree that K&Ns let in more particulate.
b) So far at least, there is no viable option for aftermarket intakes that improves upon K&N and still fits into the same form factor.
c) Some are not concerned about extra particulate, and believe it is self-evident that extra particulate doesn't produce extra wear (quite a surprise to me, but hey, I'm an engineer, not an insurance salesman. The wonderful thing about this forum is that all opinions are equal.)
d) Some are concerned, and are seeking steps to get extra filtering. I've posted what I plan to do - buying the prefilters K&N sells for this purpose.
#45
Urban Combat Vet
iTrader: (16)
So, summarizing:
a) We all seem to agree that K&Ns let in more particulate.
b) So far at least, there is no viable option for aftermarket intakes that improves upon K&N and still fits into the same form factor.
c) Some are not concerned about extra particulate, and believe it is self-evident that extra particulate doesn't produce extra wear (quite a surprise to me, but hey, I'm an engineer, not an insurance salesman. The wonderful thing about this forum is that all opinions are equal.)
d) Some are concerned, and are seeking steps to get extra filtering. I've posted what I plan to do - buying the prefilters K&N sells for this purpose.
a) We all seem to agree that K&Ns let in more particulate.
b) So far at least, there is no viable option for aftermarket intakes that improves upon K&N and still fits into the same form factor.
c) Some are not concerned about extra particulate, and believe it is self-evident that extra particulate doesn't produce extra wear (quite a surprise to me, but hey, I'm an engineer, not an insurance salesman. The wonderful thing about this forum is that all opinions are equal.)
d) Some are concerned, and are seeking steps to get extra filtering. I've posted what I plan to do - buying the prefilters K&N sells for this purpose.
b) There is no viable option (for me) on my particular car and it's current intake system.
c) Some are overly concerned about the suspected amount of extra particulate involved. And I believe it's self-evident that the engines fail and are rebuilt due to many factors. None of which have been directly attributed...or even likely attributed to the suspected differential amount of particulate allowed in by K & N's as opposed to any other filter.
d) I'll certainly consider a pre-filter, but not until I pull out my K & N again for routine cleaning and re-charging.
e) I'm not an engineer...hey, I've never even tried to drive a train. And as a goverment worker I'm even lower than insurance salemen. But I think my opinion is definitely equal with your's, and best for my car.
#48
needs more track time...
iTrader: (13)
It may not help stop finer particulate any better than the main K&N. So adding the pre-filter may only extend the time between cleanings as opposed to improving filtration. But, best I can think of for these cylinder style filters.
#49
Full Member
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Join Date: Apr 2012
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A recent experience of mine may shed some light on why the K&N replacement filters suck at filtering. I couldn't for the life of me get my air box to seal right. Had I not been looking for a problem, I wouldn't have found one. I did notice that there was a slight gap on the eyelet side of the box. I tried greasing it and all kinds of things to get it because it was so close. I never was able to get it right so I sent the filter back to K&N for a refund. It makes me wonder how many other people have that same gap and don't even know it.