philbytx Posted December 13, 2013 Share Posted December 13, 2013 HERE is a good test of stock/OEM filters vs K&N. Link to comment
Guest Kakugo Posted December 13, 2013 Share Posted December 13, 2013 This is something the sportsbike community learned many years back but still refuses to accept. I'll give one example: Ten Kate run for many years factory Honda's in both Super Sport and Super Bike. They run OE filters. The only concession to something more exotic was removing the mesh around RR series filters on very fast tracks such as Monza. The OE air filter installed on the 1000RR is more than enough to flow all the air even a highly tuned engine with a large volume airbox needs. Remarkable. On the other side I've seen more than one "performance" air filter getting a bit too thin at low mileage, which is bad news for durability because what good is an air filter with a gaping hole in it? Link to comment
CoarsegoldKid Posted December 14, 2013 Share Posted December 14, 2013 I think I'll remove the K&N off my 690. Link to comment
David13 Posted December 14, 2013 Share Posted December 14, 2013 I learned it and accepted it long ago. dc Link to comment
RPG Posted December 18, 2013 Share Posted December 18, 2013 years ago when I was considering I contacted K&N and asked for dyno reports. The person I talked to spent 15 minutes telling me that not all dyno's are the same, this and that. I finally concluded it was a scam, and today even more so. Stock filters work just fine. Link to comment
sardineone Posted December 18, 2013 Share Posted December 18, 2013 Thanks for the empirical data Phil! That data substantiates what I've come to believe from my own experience over the years that K&N = good a bug screen! Link to comment
smiller Posted December 18, 2013 Share Posted December 18, 2013 Empirical, scmiricle... my seat-of-the-pants testing indicates at least a 10% increase in horsepower and on the last fillup I saw a 5 mpg improvement. The only bigger gain I've ever seen was when I put the Amsoil in. Why the auto manufacturers can't figure out how easy it is I'll never know. Link to comment
racer7 Posted December 23, 2013 Share Posted December 23, 2013 None of this is surprising When I used to run a filter test lab. AC sold the standard dirts everyone used for filter testing (called CAD and FAD from the Arizona proving ground) Its no surprise the make a great filter to anyone who has tested filters. I wouldn't get excited about that minimal initial flow difference and would expect no impact in normal use. Of far more importance is the linear plugging rate rather than the more common J curve- if you change infrequently and operate in dirty conditions that matters. No fan of K&Ns, little reusable stainless screns and other silly devices for any normal street use. Link to comment
Huzband Posted December 23, 2013 Share Posted December 23, 2013 So can I still use K&N filter cleaner & oil on my foam dirt bike filters, or are they doomed as every other engine I've used them on? Link to comment
Joe Frickin' Friday Posted December 23, 2013 Share Posted December 23, 2013 So can I still use K&N filter cleaner & oil on my foam dirt bike filters, or are they doomed as every other engine I've used them on? If they're 2-strokes, then I suppose you won't ever have a problem with oil consumption. OTOH, whether 2- or 4-stroke, I wouldn't expect them to go 100,000 miles without a rebuild. But then, I don't think anyone ever exepcts that with dirt bikes. Link to comment
eddd Posted December 23, 2013 Share Posted December 23, 2013 Dirt bikes use foam filters because of the greater likelihood of water getting to the filter. A wet paper filter will not filter correctly and is prone to collapsing. Link to comment
outpost22 Posted December 29, 2013 Share Posted December 29, 2013 Dirt bikes use foam filters because of the greater likelihood of water getting to the filter. A wet paper filter will not filter correctly and is prone to collapsing. Geez Ed. Anyone who has turned their dirt bike into a submarine knows that! Link to comment
Huzband Posted December 30, 2013 Share Posted December 30, 2013 Okay, I'll admit it. I put a K&N filter in my truck a few months ago. It has 156,000 odd miles on it & already uses oil between 5K changes, so I figured it couldn't hurt. I tend to stick my foot in the ole Five Three, so my reward is I like the added intake honk. Mileage? With my foot I'm just happy to hammer past the all to common Prius that's holding up the left lane. They can think they're saving the planet while I'm making time. Link to comment
lkchris Posted December 31, 2013 Share Posted December 31, 2013 The IBMWR site used to have a tech article regarding installation of K&N filters on a K-bike. The testing showed zero difference in airflow between No filter installed Stock filter installed Stock filter installed and half blocked off K&N Link to comment
Martyn Posted January 2, 2014 Share Posted January 2, 2014 The IBMWR site used to have a tech article regarding installation of K&N filters on a K-bike. The testing showed zero difference in airflow between No filter installed Stock filter installed Stock filter installed and half blocked off K&N Anybody have a link to this interesting sounding comparison test ? Link to comment
philbytx Posted January 2, 2014 Author Share Posted January 2, 2014 Well, There was THIS article and THIS one ! Link to comment
Bud Posted January 3, 2014 Share Posted January 3, 2014 Empirical, scmiricle... my seat-of-the-pants testing indicates at least a 10% increase in horsepower and on the last fillup I saw a 5 mpg improvement. The only bigger gain I've ever seen was when I put the Amsoil in. Why the auto manufacturers can't figure out how easy it is I'll never know. But did you use Marvel Mystery Oil or the Lucas Oil Treatment? W/O those I'm sure your engine will blow up next week due to that increase in HP. Link to comment
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