I had a fine layer of dust upstream of the filter after running a K&N on my 2002 turbo diesel truck. I became suspicious of the filtering ability of the K&N, so I removed and cleaned the tube upstream of the filter, re-installed everything, ran it a while, and checked again. Found more fine dust. That was the last K&N I will ever use on my engines.
I also discovered there was a small layer of "gunk" (presumably dust and oil) built up on the leading edge of the turbo blades on the intake side. At the RPM that turbo spins (100,000+) I didn't want to have anything throw it off balance and cause damage. I run a stock paper type filter now.
2010 Cougar 322QBS 5er
2007 Dodge 3500 SRW Megacab, 4x4, 5.9L Cummins, 3.73, 48RE auto HYPERTECH MAX ENERGY or DIABLO PREDATOR tuning MBRP 4" Turbo back Scangauge2 for Boost, Coolant temp, Rail press & Trans Temp
Torklift Stable Loads
Does this matter if the throttle body gets cleaned periodically? Just asking b/c my mechanic cleans my throttle body and MAF about twice per year.
The dirt in the throttle body is just the visible part. That dirt is also on your valves, piston & rings. The purpose of an air filter is to stop anything except air from entering the engine.
ChopperBill wrote: I have a part time ATV service/repair business. When ever one comes in with a K&N I pull it off and show them the fine dust in the intake tube between the filter and the carb/throttle body. 100% of the time they say to take it off and install the OEM filter.
Does this matter if the throttle body gets cleaned periodically? Just asking b/c my mechanic cleans my throttle body and MAF about twice per year.
I'm at that point where it's easier to keep it an try to get some cost back out of it, but if having one is going to potentially cause issues, I'll go back to the OEM in a heartbeat. I'll probably run this by my service team to be sure.
Dirt's getting past the TB and into the motor. If you are riding in dirt run, dont walk to your dealer and get the OEM pleated paper filter. You shouldn't have to clean the TB twice a year. Matter of fact I have never cleaned any of ours at all except a RZR I bought used that had dirt in it from, you guessed it from having on an after market filter.
..as you can see in the last three post, it's obvious that the K&N filter let's more particulant into the throttle body, onto the MAF and into the engine than the OEM filter, (fact, not fiction...do the research)...But, some don't want to believe it even though there is valid research out there and also on the Dodge and Chevy forums showing factual data that the OEM filter works better than the K&N...BUT, as someone so aptly put it in and earlier post, you get to spend several hundreds of dollars and get a really cool sticker to put on the rear window.
Jim & Kathy
2013 Dodge 3500DRW Longhorn 4X4/CC/LB/Aisin tranny/4:10/Cummins: 385HP/850TQ
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And yet...oil analysis showed it was working fine on several vehicles. There was ZERO dust behind the filter on my F350.
John and Elizabeth (Liz), with 3 nutty cats
My beloved St. Bernard, Marm, lost him 1/2/12
Current rig:
1992 International Genesis school bus conversion
Jarlaxle wrote: And yet...oil analysis showed it was working fine on several vehicles. There was ZERO dust behind the filter on my F350.
....thats one.....do the research...it's there for the searching....more lab reports prove it's not a good idea to use a K&N air filter, ESPECIALLY on a diesel....but don't want to confuse the issue with facts....if it works for you , good, me personally, as well as quite a few others, would never use one with their diesel engine....and it did cause my MAF sensor to act up on the 8.1 I had, went back to OEM and never had the problem again.....hey, it's your truck and it works....good....
Also....just to clarify, you guys are talking about use of the drop-in filter AND/OR the actual intake system, correct? Meaning neither of them are as efficient as the paper?
And is it really necessary to buy the actual OEM filter? Why not aftermarket, e.g. STP, FRAM, Bosch, etc.
BigSur2
2012 Keystone Bullet 286QBS
2006 Ford F150 5.4 V8
Jarlaxle wrote: And yet...oil analysis showed it was working fine on several vehicles. There was ZERO dust behind the filter on my F350.
....thats one.....do the research...it's there for the searching....more lab reports prove it's not a good idea to use a K&N air filter, ESPECIALLY on a diesel....but don't want to confuse the issue with facts....if it works for you , good, me personally, as well as quite a few others, would never use one with their diesel engine....and it did cause my MAF sensor to act up on the 8.1 I had, went back to OEM and never had the problem again.....hey, it's your truck and it works....good....
Oil analysis has shown a K&N filters fine on...
1992 F-350, 7.3 turbo
1979 F-350, 5.9 Cummins
1979 Coupe de Ville, 542 stroker (over 100K with a K&N)
1979 Chevy K-20, ZZZ 350 crate motor (over 140K with a K&N)
1974 Ford Pinto, 1987 Turbo Coupe 2.3
1988 Dodge Dakota, TBI V6 (over 250K with a K&N)
Bonus: it was worth a 100 degree EGT drop on both my F-350's.
Jarlaxle wrote: And yet...oil analysis showed it was working fine on several vehicles. There was ZERO dust behind the filter on my F350.
....thats one.....do the research...it's there for the searching....more lab reports prove it's not a good idea to use a K&N air filter, ESPECIALLY on a diesel....but don't want to confuse the issue with facts....if it works for you , good, me personally, as well as quite a few others, would never use one with their diesel engine....and it did cause my MAF sensor to act up on the 8.1 I had, went back to OEM and never had the problem again.....hey, it's your truck and it works....good....
Oil analysis has shown a K&N filters fine on...
1992 F-350, 7.3 turbo
1979 F-350, 5.9 Cummins
1979 Coupe de Ville, 542 stroker (over 100K with a K&N)
1979 Chevy K-20, ZZZ 350 crate motor (over 140K with a K&N)
1974 Ford Pinto, 1987 Turbo Coupe 2.3
1988 Dodge Dakota, TBI V6 (over 250K with a K&N)
Bonus: it was worth a 100 degree EGT drop on both my F-350's.
Hey, guess I'd use them on the "old stuff" , maybe, but since 01' models, K& N isn't recommended....
I doubt your analysis....look up how much more particulant is stopped going into the intake and how much the K& N allows the engine to "breathe" as opposed to OEM air filter...but....don't want to confuse you with the facts....
Thought we were talking newer engines/vehicles, not vehicles that are, by your examples, 20 yrs old and older....
Op was talking about a 2010 gasser...hey, go for it...your engine....not mine......have at it.
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