Debunking the High-Flow Air Filter - BMW Luxury Touring Community
 
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post #1 of 8 Old May 12th, 2009, 7:51 am Thread Starter
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Question Debunking the High-Flow Air Filter

I'm not one to believe everything I read, but here's an article that presents a very strong argument against the high-flow air filter market. I'd like to hear the opinions of this forum on the value, or lack thereof, of products like K&N and other "performance" filters.

http://forums.nicoclub.com/zerothrea...postid=1864002


>K-daug


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post #2 of 8 Old May 12th, 2009, 8:55 am
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Re: Debunking the High-Flow Air Filter

I don't see the rocket science in that report.

More restrictive filters pass less air and filter better. That's to be expected.

Agreed, better air flow without appropriate downstream modifications will net nothing but a dirtier engine. None of this is new.

If you build a better engine, tune the intake and exhaust, you better improve airflow for the greatest HP gain. That means K&N or similar.

Throwing an air filter and pipe at a motor for more ponies won't get you there. Just more noise.

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post #3 of 8 Old May 12th, 2009, 12:58 pm
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Re: Debunking the High-Flow Air Filter

Quote:
Originally Posted by bowlesj
Throwing an air filter and pipe at a motor for more ponies won't get you there. Just more noise.
And more dirt, and oil onto the air mass sensor. None of it is good. Save your money.

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post #4 of 8 Old May 12th, 2009, 1:12 pm
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Re: Debunking the High-Flow Air Filter

I replaced my K&N air filter after 12K miles with OEM. I did not see any significant power increase and also my gas mileage dropped with K&N air filter.

Quote:
Originally Posted by K-daug
I'm not one to believe everything I read, but here's an article that presents a very strong argument against the high-flow air filter market. I'd like to hear the opinions of this forum on the value, or lack thereof, of products like K&N and other "performance" filters.

http://forums.nicoclub.com/zerothrea...postid=1864002

Matt Kas

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Laguna Niguel, Southern California (South Orange County)
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post #5 of 8 Old May 12th, 2009, 2:32 pm
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Re: Debunking the High-Flow Air Filter

The stock filters keep out the dust. K&N and the like keep out the rocks.

I helped a friend do a 12K service on his K1200RS, and he pulled the K&N, washed it with water and detergent, waited for it to dry, oiled it, and put it back in. A hell of a lot of messy work, for basically nothing or worse. If one values their time, it costs more to service a K&N than the purchase price of a BMW stock filter.

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post #6 of 8 Old May 12th, 2009, 2:36 pm
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Re: Debunking the High-Flow Air Filter

I agree, no aftermarket. I've worked air filter issues on turbine engines, although I do not consider myself an expert in these areas. But I am dangerous

Assuming street use only of course.

More air flow means either bigger holes for the air (and dirt) to get thru, or bigger filters, all else being equal. Air flow/volume is key to determining the performance of an air filter.

visual inspections are almost a joke, for instance, our filters keep anything bigger than 10 microns out of the engine. I personally can't see anything past 12 microns with my bare eyes

Its not all bad, just depends on your application/use. And ya, its fun farkling so...

But functionally, its a trade off I do believe, there are no free-bee's. I just don't think the performance gain is worth the extra dirt in my very expensive engine.

Knowing what I know today, I'd have never upgraded my air filters in the past (on my cages that is, never did an upgrade on a bike), minus the cool factor of course
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post #7 of 8 Old May 12th, 2009, 3:42 pm
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Re: Debunking the High-Flow Air Filter

I used a K&N on my supercharged (roots type) Mustang for a while and it did make a difference. But I only used it for a while.

The stock air filter was the choke point so I make a new air intake that used 2 of the stock air filters. After that I could not tell or measure the difference, dyno tested. The K&N did give me an issue with the MAF once while in service.

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post #8 of 8 Old May 18th, 2009, 1:38 am
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Re: Debunking the High-Flow Air Filter

Quote:
Originally Posted by dshealey
The stock filters keep out the dust. K&N and the like keep out the rocks.

I helped a friend do a 12K service on his K1200RS, and he pulled the K&N, washed it with water and detergent, waited for it to dry, oiled it, and put it back in. A hell of a lot of messy work, for basically nothing or worse. If one values their time, it costs more to service a K&N than the purchase price of a BMW stock filter.
Yeah, Dave, I fell for the "look at all the money you'll save," BS, years ago. After you add up cleaning, drying, and tacking times (plus the cost of the oil), you just spent DOUBLE what that $20 filter would have cost you!

"Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety." (Some really OLD friggin' White dude who couldn't have possibly known what he was talking about!) WARNING: Official HATE speech!
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