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Thread: gearing new .560"D. 38 deg S16D

  1. #1
    Join Date
    Nov 2004
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    Omaha, Nebraska
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    gearing new .560"D. 38 deg S16D

    I normally would gear a Pro Slot .513 dia. S16D (38 deg. timing) in a Rotor at about 4.2/1.
    What would a good gear ratio for a Pro Slot .560 dia. S16D with 38 deg. of timing in the same Rotor?

  2. #2
    Join Date
    Feb 2004
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    Southern California
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    Gary

    Since no one else is jumping in, I will give you a rough guess based on .560 diameter 16D vs regular small diameter. Try going up one tooth on the pinion, possibly as much as two teeth. I guess you are talking 9/38 to get 4.2,, so maybe a 10/38,, for 3.8-1,, and then maybe try 10/37 or even 10/36.

    Barry

  3. #3
    Join Date
    Jun 2002
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    Pine, AZ
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    Gary,

    We dont race S16D, out in California, But we do use the Viper 16D arms that are 560dia. I gear them 11-38 or 12-39 in the kelly set-ups with a 587 air gap. I would start there.

    Hope this helps.

    Steve Forsyth
    ParmaPSE
    3rd Eye Technology

  4. #4
    Join Date
    Feb 2004
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    Southern California
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    280
    Quote Originally Posted by Forsyth Racing
    Gary,

    We dont race S16D, out in California, But we do use the Viper 16D arms that are 560dia. I gear them 11-38 or 12-39 in the kelly set-ups with a 587 air gap. I would start there.

    Hope this helps.

    Steve Forsyth
    Steve,,,, wouldn't you gear a S16D about 1 tooth less on the pinion, closer to what I suggested? I think the lighter, shorter arm has less torque, more rpm?

  5. #5
    Grandi Racing Guest
    I would try it out with either 11-37 or 12-38. I've raced the big bruiser supers here in the northeast a fair bit, and those arms generally respond well to those 2 ratios. Keep in mind the tire sizes, too

  6. #6
    Join Date
    Jun 2004
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    Hornsby Slot Cars Sydney
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    152
    Timing totally depends on track power . High power start out with a 10 tooth pinion . Medium power 11 tooth then if you are happy try going up one tooth on pinion.
    Last edited by Ron; 11-25-2017 at 02:26 PM.

  7. #7
    Join Date
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    Wellington, New Zealand
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    This thread is 7 years old.

    Do you honestly think the OP is still interested?

    Why do you keep resurrecting old "dead" threads?

  8. #8
    Join Date
    Jun 2004
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    Hornsby Slot Cars Sydney
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    Zippity some people might be interested

  9. #9
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    They are raced now and again.
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