To K&N or not to K&N that is the question...

[ZJ2UZJ100]

Sticking with stock air box, Toyota filters.

I put K&N on the Jeep V8 after 25Kmiles, cleaning and re-oiling according to directions, at 50K. Ran it up to around 60K miles.

I started to get problems with throttle lag and cold idle at 60K. The MAF was fouled with oil, and the throttle plate was all gummy. Had to clean up both, and I switched back to a paper filter (Fram). Haven't had the problem since. Over 120K miles now.

I can't objectively comment on dirt bypass and any extra wear on cyclinders, but the Jeep now eats a quart of oil per 1.5K miles.

 

[Gene3x]

Why not a larger more efficiant intake with a regular paper filter?

 

[SHONUFF]

Here is an easy way to see how bad a K&N is. Next time you're at a parts store, take a K&N out of the box and hold it up to the store lights. Try to look through it at the light (I've done it and I seen specs of light shining through). If you can see light, then more then likely, one can assume that dirt and dust will also pass-through....

 

[spressomon]

Save your money!

 

[subspd]

So what filter???

 

[calamaridog]

Toyota OEM or Denso. Denso probably makes the Toyota filters anyways.

 

[Tinkerer]

K&N has not yet replied to an email I sent a couple of days ago asking for test results comparing their filters with OEM type filters.

I guarantee that have done such testing, and/or had it done by third-party labs. If it is favorable to K&N (or at least neutral), they should have no problem providing the results.

The 2 day delay is not a good sign for K&N's standing.

(Tinkerer becoming suspicious of K&N...calling local Toyota dealer to check stock of OEM filters...but see other post about the warped OEM filter frame > leaky OEM filter...)

 

[mot]

I talked to a Yamaha guy tonight who does air filters for their motorcycles and he told me that for filtration paper-type filter is better than K&N.

Also a guy who knows a little about their MotoGP work told me that they use a paper-type filter for their championship winning M1, although it is a specially designed/made one. He said that they tested that type with the sponge type and it performed better.