Stock Air Filter restriction

Discussion in 'Engine, Fuel and Exhaust' started by wilks3, Jun 3, 2011.

  1. wilks3

    wilks3 Junior Member

    623
    0
    1
    Hi All, I wanted to see how much restriction the stock air filter was. I took the forward breather tube off and stuck in vac hose into air filter, then routed to vac gauge tie-wrapped to handlebars.
    Riding like I do up to 60 MPH NO vacuum observed. Now bike in 3rd gear went to WOT, a steady 1" vac.
    4th gear WOT, 1" vacuum.
    5th gear WOT, 1" vacuum.
    6th gear WOT, 1" vacuum.
    So, to me, if your not gonna ride it like you stole it, the stock air filter ain't that bad. This is with 4500 miles on filter, New one might be better.
    So, If I add a S&S teardrop air cleaner assembly, riding like I do, all should be good in air/fuel mixture land.
    Thought this might be of interest to some of you guys/gals!!!
    Ride Safe
    wilks3 :D
    :USA
     
    Last edited: Jun 3, 2011
  2. Jack Klarich

    Jack Klarich Expert Member

    18,544
    153
    399
    Interesting test, thanks for the info:s
     
  3. 67wizard

    67wizard Junior Member

    495
    28
    1
    Wonder how that compares to K&N filter?
     
  4. wilks3

    wilks3 Junior Member

    623
    0
    1
    wizard, If you had a K&N you can test as I did. Simple to do. Would like to know!
    wilks3
    :USA
     
  5. glgarrett

    glgarrett Active Member

    203
    0
    0
    Wow. There is so much to learn on this site. Thanks!:small3d028:
     
  6. 67wizard

    67wizard Junior Member

    495
    28
    1
    I don't have a vac gauge and its fifty miles to town.
     
  7. wilks3

    wilks3 Junior Member

    623
    0
    1
    wizard, Sounds like excuse to go to town.:D
    wilks3
     
  8. 67wizard

    67wizard Junior Member

    495
    28
    1
    Just might do that today. Been very windy around here lately, maybe today it will let up.
     
  9. Hoople

    Hoople Account Removed

    7,198
    0
    34
    At least on my stock air cleaner, it has a front scoop that kinda "rams" the air into the cleaner when moving forward. I would bet that offsets a 1" vacuum that the filter may have (?)

    The scoop has to have some effect on air pressure.
     
  10. wilks3

    wilks3 Junior Member

    623
    0
    1
    I don't know if that much is rammed in with stock air cleaner cover. I did have the cover on when doing my test to get a true apples to apples reading.
    wilks3