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  1. #1
    Member gochenour799's Avatar
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    Default gear ratio help please

    I need help calculating a reducing gear ratio. Example.. I have a gasoline motor I want to run @ 2000 rpms and a pump that needs to be run a 1250 rpms so I need to reduce the out put by putting a small gear on the motor and a larger gear on the pump , with chain in-between them . I can't figure out how to figure the size of the gears . Say 10 teeth and 20 would that be 50% reduction ?

  2. #2
    Gold Member
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    Nov 2006
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    Barossa Valley, South Australia
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    Duetz DX3.70, Fendt 305LSA,260S & 205P,Kubota B6100E & 3 x B5100E & RTV900, Caterpillar 428C

    Default Re: gear ratio help please

    Quote Originally Posted by gochenour799 View Post
    I need help calculating a reducing gear ratio. Example.. I have a gasoline motor I want to run @ 2000 rpms and a pump that needs to be run a 1250 rpms so I need to reduce the out put by putting a small gear on the motor and a larger gear on the pump , with chain in-between them . I can't figure out how to figure the size of the gears . Say 10 teeth and 20 would that be 50% reduction ?
    2000 divide by 16 times by 10 = 1250.

    So you'd need sprockets of 10 and 16 teeth for the motor and pump respectively.

  3. #3
    Member gochenour799's Avatar
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    Default Re: gear ratio help please

    Quote Originally Posted by allenr View Post
    2000 divide by 16 times by 10 = 1250.

    So you'd need sprockets of 10 and 16 teeth for the motor and pump respectively.
    Wow that was fast ..... THANK YOU so much for the reply..

  4. #4
    Gold Member
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    Mar 2010
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    Canada
    Tractor
    RTV1100 2009

    Default Re: gear ratio help please

    1250 divide by 2000 = .625

    10 divide by .625 = 16

  5. #5
    Elite Member Baby Grand's Avatar
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    Nov 2007
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    4,492
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    Windsor, CT.
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    Kubotas: L3240GST B2320HST B5100D & G5200H

    Default Re: gear ratio help please

    A 10 tooth pinion is kinda racy. Try a 20 tooth pinion & 32 tooth gear.
    That's the problem with trouble.
    It always starts out as such fun."
    - Randall Brown

  6. #6
    Super Star Member LD1's Avatar
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    Central Ohio
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    Kubota l3400

    Default Re: gear ratio help please

    or a 15 and 24
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


    Ford 5500 Backhoe
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  7. #7
    Bronze Member
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    Feb 2007
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    Location
    N. California
    Tractor
    Kubota BX1500, BX2230

    Default Re: gear ratio help please

    Don't know if you've shopped for sprockets yet, but here are two places I've used that have good prices:

    www.thebigbearingstore.com, click on "roller chain" to get to the sprockets link. They also have lots of inexpensive bearings.

    BMI Karts and Supplies - Home, basically go-kart stuff but they have lots of big sprockets.

  8. #8
    Member gochenour799's Avatar
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    Default Re: gear ratio help please

    Ok thanks everybody... I think I will idle the motor down to 1950 rpms and run a 25 / 16 that will give me 1248 rpms on the pump .

    .1950/25x16=1248 ... the reason is I already have these sprockets...and if I need more I can just bump the idle up on the motor .

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