For those that use K&N air filters, I thought you might find this interesting...if not, oh well...

http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm

 

That's some good info. Sort of blows the lid off the claim that K&N can flow more while maintaining good filtering characteristics. Looks like the high-flow claim is valid, but the good filtering characteristics claim appears to be false in looking at that case study.

I might just pop my K&N filter out for the winter and use the stocker.

 

I've used K&N drop-in filters for about 5 years now with absolutely no problems.

 

not too much worry for dusts... they all get burned inside the engine

 

You probably wouldn't notice any ill effects, but dust and dirt getting through your filter is defeating the purpose of the filter. The effects would be too gradual to be noticed, but it definitely would accelerate engine and turbo wear.

 

This thread is interesting. I remember that the surface areas of the filter medium and the largest particle size that medium can pass will substantially affect flow rate at a given pressure. My concern after looking at the test results on the KN centers over how quickly the filter loads up to its maximum restriction limit. This is especially revealing when you consider th KN is accumulating less particlate matter per cu. ft. of air filtered.

On a race car I wouldn't have a problem but on a daily driver I have to wonder if this filter is a wise choice. I ran an oil bath filter for 30 years on my 50 Plymouth with no problems but it didn't have a tubocharger with a high velocicy fan for dust to bombard.

 

Well crap!! What a disappointment. OE filters probably cost you around $15-20 every onter oil change and the aftermarket will cost anywhere from $80-500 depending on the set-up.

This whole time I've used one K&N and a weaponR foam filter on my GSX and was going to go with a simular set-up on the EVO...the study has really got me thinking twice.

They used to do this back in the 1800's and such with a liquid that would not only cure every illness but take out stains in your clothing. What a disappointment and load of BS the aftermarket filter manufactures put out to get rich off of our trust. -"K&N filter will give you 14hp, dyno tested" load of crap...It's time to see some real tests by them!

Joey

 

This looks like a comparison test ... at what point does dust become "too much" for a motor?

jcnel.

 

It is a comparison test, and the point is K&N does in fact flow more, but it doesn't even meet, let alone exceed, the filtration levels of OE filters. This goes against their claims.

I don't think there is a point at which there is "too much dust" under most driving situations, there is just accelerated wear wich I'm sure correlates to the amount of particulate bypassing the filter and entering the engine.

 

Where can we get Evo specific AC filters for our cars

 

I'm confused. Do you guys run your cars in dust storms often?

 

good article. I saw something like this on a supra website a while back, except on a much cheaper scale. basiclly they took a supra to a dyno and checked hp and then used something similar to a coffee filter(can't remember exactly what it was), under various aftermarket filters and ran the engine. The one that came out the best all around was the apexi filter it had best hp and cleanest air quality. I wish I could remeber the site and what all filters they tested. anyway the k&n looks alright along as you clean it very often.

 

They do make that "sock" that is supposed to slip over the filter now. How much is works is still a mystery to me. I've always believed that nothing filters better than a quality paper filter, but you sacrifice flow. Using a K&N, or any cotton gauze, would be the other way around; more flow but less filtration. Believe it or not, but using a K&N also shortens any extended oil drain intervals significantly as well because of the amount of silicone build up in the oil. If you look at a freshly oiled K&N, all the spots of light you see is where the dirt passes through...

 

I don't believe that. Two oil changes after 5000 miles each with oil analysis after, neither showed anything that would prove your statement. Matter of fact Blackstone labs said I could increase my interval to 6000 miles if I wanted. Just a FYI.

 

Good info!

How many miles less my engine would last with a performance air filter? obs: changing the engine oil every 3000 miles.

They did a test with AMS and I think that it is a foam filter. Is Ralliart air filter made of foam? I mean, Is Ralliart better than K&N?