Stock Bike needs new air filter
- Thread starter Vegas Sam
- Start date
brownfoxx1
Active Member
on k&n web site all you need is your OEM AIR FILTER P/N.
gusotto
Junior Member
A friend had a K&N filter to replace the stock filter. This was using the stock hardware. All I had to do was remove old filter and replace with new K&N filter.
It just so happened the local H-D dealership was running a special on dyno runs so I decided to run the stock and then switch with the K&N and see what difference I might see in filters. No other changes, just run stock, then swap in the K&N.
On my '02 1200 XL.
HP I gained .5 with the K&N.
Torque I lost .8.
The small differences didn't justify the cost of the K&N.
He wanted $65.
Later I did do a complete Stage 1, using both the SE A/C and SE mufflers and also doing a change with the jets on the Sportster.
Then it was noticable and worth it.
It just so happened the local H-D dealership was running a special on dyno runs so I decided to run the stock and then switch with the K&N and see what difference I might see in filters. No other changes, just run stock, then swap in the K&N.
On my '02 1200 XL.
HP I gained .5 with the K&N.
Torque I lost .8.
The small differences didn't justify the cost of the K&N.
He wanted $65.
Later I did do a complete Stage 1, using both the SE A/C and SE mufflers and also doing a change with the jets on the Sportster.
Then it was noticable and worth it.
Hoople
Account Removed
K&N says their filters demonstrate a cumulative filtration efficiency of between 96% and 99%.
They don't compare their numbers to OEM stock filters so it's somewhat of a meaningless specification.
I still run a stock air filter out of fear of ingesting sand and dirt into my engine. The charts show a gain in power/torque but do they really filter as good as they say they do? I would like to let my engine breath better but not at the cost of loosing compression over time.
If those filter systems were that good, I would think some of the specialty cars would come DIRECTLY from the factory with them. An example would be the Shelby Mustang GT 500. Not one produces the claimed 500HP in FACTORY trim & could use all the extra help they can get to meet spec. But I think the factory won't use them because of the dirt they allow to pass.(?)
I know the factory system does trap the dirt well.
Just wondering what others think about possible engine wear verses the small gain in performance.
They don't compare their numbers to OEM stock filters so it's somewhat of a meaningless specification.
I still run a stock air filter out of fear of ingesting sand and dirt into my engine. The charts show a gain in power/torque but do they really filter as good as they say they do? I would like to let my engine breath better but not at the cost of loosing compression over time.
If those filter systems were that good, I would think some of the specialty cars would come DIRECTLY from the factory with them. An example would be the Shelby Mustang GT 500. Not one produces the claimed 500HP in FACTORY trim & could use all the extra help they can get to meet spec. But I think the factory won't use them because of the dirt they allow to pass.(?)
I know the factory system does trap the dirt well.
Just wondering what others think about possible engine wear verses the small gain in performance.
Hoop, I worried about the same thing and then noticed that the local dealership had a K & N shelf. With an unlimited mileage warranty, I figure neither the dealer nor the MOCO would sell something which generated warranty work. All it would take is one denial of warranty claim BECAUSE of an air filter the dealer sold and the bad publicity and complaining could be heard without benefit of the internet. For me it was a saving money thing, not looking for 0.5 hp gain.