K&N intake air system

If you are getting sand through ANY filter, it isn't a filter. The fine dust that is the issue with the oiled filters is almost the same size and the particulate in diesels. Wipe your finger on the inside of the intake after the filter, and compare that to the inside of the exhaust tip (pre dpf trucks). The egr particulate is always there - as long as the truck is up to temp - the dust passed from the filter varies, usually there is none, as most pavement driving is in clear air.

christopherglenn wrote:
The egr dumps raw exhaust into the intake, in the case of diesels, it dumps particulate - far more then you ever see out the tailpipe - into the intake between the filter and the turbo. Most of the particulate is burned off in the cat, and what is left is out the tailpipe. All stock diesels in the last 10 years or so have a egr from the factory. Gas engines have had one sense the late 70's, but the exhaust is far lower in particulate then diesels.
My point is the extra dirt that the k%n and similar filters let in isn't alone, from the factory there is a lot already there.

Diesel particultes are a little different than heavy dust or sand. Run a K&N for a long time on a diesel then look @ the turbine wheel. You'll want to go back to a dry filter. Dust & sand injested into a boosted eng is far more devaststing than you think. Kinda like a sandblaster.

The egr dumps raw exhaust into the intake, in the case of diesels, it dumps particulate - far more then you ever see out the tailpipe - into the intake between the filter and the turbo. Most of the particulate is burned off in the cat, and what is left is out the tailpipe. All stock diesels in the last 10 years or so have a egr from the factory. Gas engines have had one sense the late 70's, but the exhaust is far lower in particulate then diesels.
My point is the extra dirt that the k%n and similar filters let in isn't alone, from the factory there is a lot already there.

I've posted this answer before and here goes again. My son is a NASCAR driver and he says they work great on race cars since they need all that air at high rpm's. plus they tear down their motors after every race, bar none. BUT, we RV'ers do not have the money to have our trucks engines torn down after every camping trip, so the answer is NO. don't use them for Rv towing. waste of money, use the money to buy gas and forget about it.

I think its less of a problem than others state. I have run one for a long time on my truck. Just have to make sure its cleaned, let dry then oiled correctly. I have only run into a problem once with the filter. I under oiled it and the truck went into reduced power.
It does give the truck better throttle response. Not certain if better economy is gained.

It may increase airflow, initially, but tends to restrict quicker when used in moderate conditions. I have a K&N on a 5.4 V8 and don't notice any significant mileage improvements. The K&N needs scheduled cleaning and reoiling to function correctly.

Since Ford chose to equip the 5.4 V8 in 2003 with an air filter that was prone to flange damage, I chose to use a K&N filter. Since 2005, the Ford filter flange has been redesigned with a reinforced flange material. When/if I replace my K&N filter, I will probably choose the newer Ford paper filter.

OMG...Duel POSTS...OMG! Someone inform the POST POLICE!...OMG

Here's a study of factory vs K&N vs. . .


K&N became restrictive faster, and passed more dirt than the ACDelco paper filter.

Another GINSZU KNIFE subject. Eliminate your fuel filter raise horsepower, time...

christopherglenn wrote:
........ As far as letting grit past the filter and into the engine, that is what the EGR is for.

What?:?