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Discussion Starter #1
Ordered a K&N filter from my dealer the other day, brought it home and opened it up and the manufacture box and paper work inside list the filter as "race only", "not for road/highway use".
I didn't want or order a "Race" filter, just wanted a re-usable one that flowed well.
Will this 2 ply filter make that much of a difference to my fuel/air ratio? Bike is stock (performance wise) other than dual Hindle slip-ons.
 

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Stick with OEM or the BMC filter. K&N filters cause a loss of 1-2hp in these bikes.
 

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Stick with OEM or the BMC filter. K&N filters cause a loss of 1-2hp in these bikes.
I read that the BMC filters allow too much air/debris in for people just putting around town. Article said BMC was a good filter for track but for the average rider the K&N was the better choice.
 

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I disagree. I have run BMC race filters in every bike I have owned since 2001 or so, both street and track, with most of them having 50,000+ miles on them before I got rid of them. Never had a single issue.
 

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I disagree with the HP loss hype on a K&N filter.

I'm pretty sure my bike would have made the same net HP with a BMC, oem or K&N. It has a K&N in it because it needed a filter at the time and and no other brand was available at that moment. It has not been a problem.

Dynoed May 2014 at Livengood Motorsports. Stock motor and nothing but a M4 GP slip on pipe with all ecu nannies removed including SET. PCV tuned by Livengood on premium pump gas non ethanol.


That's 170 hp as I know the prints small. Made 155 hp stock.

Its a racebike only.
 

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I disagree with the HP loss hype on a K&N filter.

I'm pretty sure my bike would have made the same net HP with a BMC, oem or K&N. It has a K&N in it because it needed a filter at the time and and no other brand was available at that moment. It has not been a problem.

Dynoed May 2014 at Livengood Motorsports. Stock motor and nothing but a M4 GP slip on pipe with all ecu nannies removed including SET. PCV tuned by Livengood on premium pump gas non ethanol.


That's 170 hp as I know the prints small. Made 155 hp stock.

Its a racebike only.
Did you dyno with stock filter,immediately remove stock filter,install K&N and then immediately re-dyno to validate this statement? Otherwise there is no hard data to support your claim.
 

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Loves dem stickers&'70s porn star bushes
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Did you dyno with stock filter,immediately remove stock filter,install K&N and then immediately re-dyno to validate this statement? Otherwise there is no hard data to support your claim.
There is no hard data to support either statement.
 

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There is no hard data to support either statement.
Theres been plenty of claims thrown around in this thread,so which one specifically?

FWIW,the BMC Race I have in my head/cam 1000 made exactly 1rwhp less then running no filter whatsoever. Stock filter showed 4rwhp less than BMC Race as well.
 

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There is no hard data to support either statement.
The hard data on the K&N filters dropping power is all over this site, do some searching.
 

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You should listen to me. No, seriously, listen to
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Don't know about power loss but the bigger issue for street use is filter efficiency and engine wear, which was what Motionelco said above. See posts #6 & #7 here. Tim Radley's signature used to include a warning about using race filters on the street but he's stopped coming here.
 

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I have done back to back on several bikes yes there is hard data
2012 gsxr 1000
stock - 157
k&n and bmc std - 155/156 - light oil
bmc race - 159
carbon bmc race - 156- I still have it if any one wants it

I have never seen any reason to not run a bmc race on the street (if you are putting around town you are not sucking anything into the air filter anyway)

jason
 

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Thanks Jason^^
 

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Don't know about power loss but the bigger issue for street use is filter efficiency and engine wear, which was what Motionelco said above.
+1

I would not trade increased engine wear for a few top end hp.
 

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there is no difference from what I have seen tearing down engine after engine.
maybe if it was a dirt bike or atv but then you should be using a foam filter

jason
 
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