boost #'s and drive ratio/% Q's
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boost #'s and drive ratio/% Q's

  1. #1
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    Default boost #'s and drive ratio/% Q's

    I just got back from Cali with my New 14-71 kit It has a 32 tooth upper pulley and a 35 tooth lower pulley.I did some research and this is what I got from Dyers website........

    How do I calculate the blower drive ratio?

    To calculate the drive ratio, take the difference between the 2 pulleys and divide that number by the lower pulley. For example, if you have a 41 top and a 34 crank, the difference is 7 teeth. 7/34=20.6%. Since the upper pulley is larger than the crank, it is 20.6% underdrive.

    here is my setup.....

    #1 (Scanario)
    32 top and 35 crank, the difference is 3 teeth. 3/35=11.6% Since the upper pulley is SMALLER than the crank, it is 11.6% over drive

    Question? What would the boost be?


    #2 (Scanario) ....
    35 top and 32 crank, difference is 3 teeth. 3/32=10.6% Since the upper pulley is LARGER than the crank, it is 10.6% under drive

    Question? What would the boost be?


    Does this look right?
    G H E T T O F O E L I F E
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    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
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  3. #2
    Resident Ford Nut Sleeper CP's Avatar
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    What would the boost be ?

    Mike I don't know jack about blowers but I do know that boost (psi) is just resistance to flow. Therefore your boost on an engine would not only be determined by the over/under drive but heads and cam.

    Smaller heads creating more resistance and building more boost, may not make as much power as larger free-flowing heads creating less boost. The larger heads will flow more air under less boost and will not create as much heat so they can and more than likey make more power ( If that makes any since)

    Good luck with the project

    Sleeper CP
    Last edited by Sleeper CP; 01-31-2009 at 05:11 PM.

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  4. #3
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    What would the boost be ?

    Mike I don't know jack about blowers but I do know that boost (psi) is just resistance to flow. Therefore your boost on an engine would not only be determined by the over/under drive but heads and cam.

    Smaller heads creating more resistance and building more boost, may not make as much power as larger free-flowing heads creating less boost. The larger heads will flow more air under less boost and will not create as much heat so they can and more than likey make more power ( If that makes any since)

    Good luck with the project

    Sleeper CP

    I found that out on my small blower motor.


    This motor will have my AFR 345's on her Im shooting for the 1000hp-1200hp range. It will be full of Straub's goodies(msd,afr's,valves,springs,cam,rollers,etc)
    G H E T T O F O E L I F E
    Quote Originally Posted by cave View Post
    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
    Quote Originally Posted by Kyle View Post
    Some peeps just build it 1 part, 1 week, 1 paycheck at a time

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    Half a bubble off jrork's Avatar
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    Quote Originally Posted by 396_Ways_To_Spit View Post
    I just got back from Cali with my New 14-71 kit

  7. #5
    B.A.M aka "Black Azz Mike 396_Ways_To_Spit's Avatar
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    Ok, Ill post some up in da morning
    G H E T T O F O E L I F E
    Quote Originally Posted by cave View Post
    They bout shit themselves when yelled in Messican, "No brakes no brakes."
    I showed them all the sticker on the side that reads "Driver Ricky Bobby" They just looked at me and nodded yes yes
    Quote Originally Posted by Kyle View Post
    Some peeps just build it 1 part, 1 week, 1 paycheck at a time

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    Boat Nut sleekcrafter's Avatar
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    Ring Ring Ring Ring or is it BUZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ tic toc....... we need pics!

  9. #7
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    is this 1/2" drive or 8mm drive????...also...just put a boost gage on it & ck the boost when running to see what u have & chng the pulleys accordingly to get what u want!

    FastRat

  10. #8
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    [quote=396_Ways_To_Spit;529576]I just got back from Cali with my New 14-71 kit It has a 32 tooth upper pulley and a 35 tooth lower pulley.I did some research and this is what I got from Dyers website........




    here is my setup.....

    #1 (Scanario)
    32 top and 35 crank, the difference is 3 teeth. 3/35=11.6% Since the upper pulley is SMALLER than the crank, it is 11.6% over drive

    check out the website for theblowershop.com and you'll find graphs for pulley/ratios/boost
    good luck

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