If you have an American car like a Mustang or something and want to get more power a cold air kit with a K&N is not a bad idea.


But these are not Fords, or Chevy's, or have anything in commen with the two. In regards to high end European cars K&N filters a totaly pointless and worthless.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Thanks---I think.

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xafman
1984 300TD 182,000 mi FOR SALE
1972 Chev Longhorn PU--restored
1994 Buick Roadmaster 7200 mi (actual)

There has been detailed study on a commercial diesel engine with K&N versus paper and felt filter, conclusion was K&N let in more dust and the CFM air intake factor was nothing significant over paper or felt.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT

http://home.stny.rr.com/jbplock/ISO5011/SPICER.htm

Filter Efficiency is a measure of the filters overall ability to capture dirt.


In the chart below it’s important to note the different test durations for each filter. The AC Delco filter test ran for 60 minutes before exceeding the restriction limit while the AMSOIL and K&N tests each ran for 20 and 24 minutes respectively before reaching max restriction. In 60 minutes the AC Filter accumulated 574gms of dirt and passed only 0.4gms. After only 24 minutes the K&N had accumulated 221gms of dirt but passed 7.0gms. Compared to the AC, the K&N “plugged up” nearly 3 times faster, passed 18 times more dirt and captured 37% less dirt.

ForcedInduction,

Many thanks, this is the exact test I was referring to, I have a PDF saved somewhere but have to dig it up, you saved me all the trouble.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT

i finally found the info i was looking for. this page shows that the stock paper filter for a volvo is one of the last places you should spend $ while trying to reduce airflow restriction. mercedes filters are similar with lots of folds.

http://www-unix.oit.umass.edu/~tcroy/articles/intakerestrictions.htm

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped

Ok, I'm convinced! Does anybody want to buy a good used K&N? Who wants a free one?

Chris

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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss

I'll take a free one! what these tests don't tell you is how the maintenace was applied to the K&N filter. I already said that I made an oil bath filter and put my K&N into that. If you think you can just spray on a bit of oil and go for 50,000 miles your mistaken! The Filter needs to be oiled FREQUENTLY! Most air filter housings have a dish about 1/2 inch or more and it's not hard to pour some Marvel oil in there, which is very particulaphyllic by the way, and clear it out periodically. The K&N filter is sitting in a pool of oil and the air passing through it is blowing bubbles in the filter oil. Ever seen a desert dust storm? My secondary wick sponge filter after the K&N has ZERO dirt in it after a dust storm with 30 MPH driving Speeds and visibility of 40 feet or less! Your test won't show that either! Get creative and modify! You can't just plug statistics into a test program and expect perfect results. the paper filter is a TOTALLY different animal than an oil wick or oil bath one and if you think these results matter after applying one coat of oil and testing it against the life of the paper filter to see who comes out on top is ridiculous because they are not designed to operate the same. EVEn K&N specifies and points out that 50,000 between filter maintenace is under the most IDEAL conditions. Don't get a K&N because you want more power at your right foot, get one because they can be modified to surpass any other filter at getting the dirt out!

How many times does this myth have to be killed?

K&N filters are useless on our diesels. If you don't understand why, you should not open the hood of your car, ever, and put it on EBAY stat.

Buy a ricer.

Have a wonderful day.

240Joe

I like the K&N provided it is used appropriately. I have one on the MB and one on the work truck. Oil analysis, three tests to baseline each before the K&N's were installed and three afterwards were performed. There was NO increase in silica, wear metals, etc. in any of the post tests nor have there been since. If crap is getting past the K&N's the analysis would show it. In my applications, low dust, on road in a fairly wet climate, they seem to work okay. I doubt they work well in dry, dusty environments like the Southwest. I also oil the bejeezus out of the filters.

IMHO, the K&N does have a great application on MB's. Replace that Rube Goldberg affair of a filter on the 617. RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

They do not work well in a dry desert with heavy dust just dropped into the filter housing and forget it! But I was literally changing paper filters after every dust storm because they would get clogged in one 100 mile trip. It's worth the effort to make an oil bath for this filter as I'm no longer changing them as often. A rivet gun or welder to put up the divider to form a sump for about 1/2 to 1 inch of oil to saturate the K&N and it works ideally here. K&N being an oil base filtering system is the only one durable enough to take a oil bath and last, but I can feel no difference at the throttle. But I'm glad you mentioned oil analysis because several years of engineering taught me that this is what you base your schedule for oil changes and service intervals and I would recommend everyone do an analysis at least once per year although twice would be better! I change my oil every 5000 miles and clean my oil bath K&N as often as once every 3 months showing how important it is to know the facts about what is going on under your hood. Most of you do not live in a climate where blowing dust can cut your visibility down to 15 to 25 feet and desert dust can turn into an industrial grade diamond in the combustion chamber of a diesel engine! Try a real test. Take a piece of foam rubber and bath it in Marvel Mystery Oil and place it inside of your stock filter assembly and look at it after 3 months of driving and post back what you see in real life conditions. Make sure you use Marvel Mystery oil as it will not break down foam rubber. Cut a piece of wire screen and place it in the inside of the foam rubber to keep it from coming loose. No need to drench it, just make sure it is fully penetrated. This will be a real indicator of how good your filter is. This will be well worth the effort.

how many times do you have to be banned?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

K&N filter topic links thread
http://www.peachparts.com/shopforum/diy-links-parts-category/173036-k-n-filter-topic-links-thread.html#post1354738

I believe it's 3 now. He won't be back until December this time.

I will take all of this as a maybe. Guess I will install one and see what happens. Thanks

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xafman
1984 300TD 182,000 mi FOR SALE
1972 Chev Longhorn PU--restored
1994 Buick Roadmaster 7200 mi (actual)