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Which Intake Air Filter should I use?

Discussion in 'Fuel / Air' started by Mastiff Rider64, May 14, 2017.

  1. Mastiff Rider64

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    As some of you know I'm having a S&S 124 put on my BD Mastiff and I also am having the Baker Primary belt drive install. When I was running my S&S 117 which was running a 10.5:1 compression, and had lots of top end work done to it I was running the BDM Spike air cleaner. Which seem to do fine up to 80 mph. anything over that and it would cough thru the carb at steady throttle. Well I'm wondering since I also have the BDM Velocity Stack, which would perform better? Now this isn't the 90 degree velocity stack its the straight out one. When deciding which to go with a while back a well known mechanic in the area told me to go with the Spike, but now with the bigger motor and the fact I'll be running 10.8:1 compression, .640 cam, I'm wondering which would preform better and will either provide enough air? I'm also running the FSD Hotrod Sinful exhaust.
     
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  2. FrankBDPS

    FrankBDPS Well-Known Member

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    I would see what S&S recommends. What kind of numbers do you expect out of that engine?
     
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  3. pauly

    pauly Active Member
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    S&S Dual Runner tuned induction is my choice. Don't think you'll get more airflow with anything else.

    Paul.
     
  4. BWG56

    BWG56 Guru

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    Spot on :agree:
     
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  5. cdogg556

    cdogg556 Guru

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    It without a doubt has better air flow, but I gotta say for me they are butt ugly, sorry just not my style, :sorry: the stock Big Dog air filter is by far the best looking in my humble opinion. :oldsmile: :old2:
     
  6. Dakota

    Dakota Well-Known Member
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    I had the Arlen Ness 90 degree with filter on my Mastiff 117 with 640 cam and Thunder Jet and it would cough thru the carb every once in awhile. Switched to the velocity stack BDM was selling when they were still selling parts and it has never coughed since. My :2cents:

    [​IMG]

    [​IMG]
     
  7. Mastiff Rider64

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    128 HP 138ft-lbs torque
     
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  8. Mastiff Rider64

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    I swear I love the look of it, just worried about my leg hitting it while riding. But I hate to have to install a thnderjet in it also. But either way I'm going to have to have the ignition tuned, carb jetted which is the time to put thunderjet in, which ever air breather put on and go with the one with a better performance numbers of the two on the dyno.
     
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  9. Dakota

    Dakota Well-Known Member
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    Your leg is going to know the stack is there takes a little getting used to but now never give it a second thought.
     
  10. bdm7250

    bdm7250 Guru
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    :agree: :old2:
     
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  11. bdm7250

    bdm7250 Guru
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    And I thought you had taste...:skep:. :oldlaugh:
     
  12. dentdude36

    dentdude36 Guru

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    :cry:
     
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  13. bdm7250

    bdm7250 Guru
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    :skep:
     
  14. Big D Florida

    Big D Florida Well-Known Member
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    Man, that's nice Dave !!!
     
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  15. Hirter6Pack

    Hirter6Pack Not Quite A Guru

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    I like the look of the dual runner and would my choice if I was to change but to me the stock breather is a classic BigDog signature
     
  16. cdogg556

    cdogg556 Guru

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    Well that's a matter of opinion, :oldsmile: never claimed to like what others do, :nonod: I just like what I like, doesn't mean I have "taste" :oldlaugh:
     
  17. JR03CHOPPER

    JR03CHOPPER Well-Known Member

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    I am running a 124R in my K9 and it has the S&S dual runner. It occasionally coughs at steady speeds. Whenever I stay stready on the throttle for a long period if time.
     
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  18. pauly

    pauly Active Member
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    Wrong jetting/ adjustment, wrong air bleed or an air leak.

    Paul.
     
  19. BWG56

    BWG56 Guru

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    Mine did that also, annoying as hell. And then I read this PDF and bumped my intermediate up from 32 to 33, which I thought was too big but thought I would give it a try. Its gone now:old2:. I'm sure you have this but any who here it is again. Read #7
     

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  20. cdogg556

    cdogg556 Guru

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    You know for a guy that was accused of being annoying, you sure give a lot of advise and help out when you can, makes me wonder about the accusers, hmmmm? Good job ya hoser! :old2:
     

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