9.5 us gear vs 9.5 toms vs 10 inch

Discussion in 'PSI Superchargers Tech Questions' started by fasttimesracing, Mar 7, 2015.

  1. fasttimesracing

    fasttimesracing Member

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    Can anyone tell me if a ten inch toms gear will fit in a moser aluminum bolt thru housing? I have a 9.5 us gear but wanting more life than what I'm getting.any help would be appreciated .thank you
     
    #1
    fasttimesracing, Mar 7, 2015
  2. Mike Canter

    Mike Canter Top Dragster
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    Have you called Tom and asked him? Tom's 9.5 gears are cut on the same machine as the 10" gears so the teeth on both the ring and pinion are wider than most.
     
    #2
    Mike Canter, Mar 7, 2015
  3. fasttimesracing

    fasttimesracing Member

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    No I just pulled it apart an saw it today.so I was hoping someone had been thru this before.will call him monday
     
    #3
    fasttimesracing, Mar 7, 2015
  4. rickey

    rickey Member

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    Mark Williams is doing a 10" gear now
     
    #4
    rickey, Mar 9, 2015
  5. jay70cuda

    jay70cuda Well-Known Member

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    Is it really that much better? Like my us9.5 4.56 gear last around 1-1.5 seasons. That's usually 50 runs for me. For much further does toms go
     
    #5
    jay70cuda, Mar 9, 2015
  6. Bob Meyer

    Bob Meyer Comp Eliminator

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    generated from....

    The 9.5" and 10" are generated from that size tooling. Both measure 9.400" O.D. If a case has been run with a 9.5", the generated 10" will clear the case, but you will need a longer front pinion support body. (there is a spacer available, but misses the o-ring seat properly, good luck !)
    The housing face may be an issue with the notches. Easy fix is to buy a new model Fel-Pro #2302 gasket, use it to mark housing face and machine notches larger, if necessary.



    Bob Meyer
    Meyer Race Cars / San Diego
    2015 Our 50th Anniversary
     
    #6
    Bob Meyer, Mar 9, 2015
  7. fasttimesracing

    fasttimesracing Member

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    So what your saying bob is if iv been running the 9.5 us gear then I should be able to fit his ten inch? I just had to touch my housing in two spots to clear the 9.5.how much do you have to move the pinion forward ? I tried calling today after I got off work but he wasn't their.wonder if he makes a spacer for the moser?
     
    #7
    fasttimesracing, Mar 9, 2015
  8. Bob Meyer

    Bob Meyer Comp Eliminator

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    Yes, the teeth are slightly larger and the housing MAY have to be altered. I'm not sure of the exact dimension of the longer pinion, but it's about .250 longer where the bearing rides. If Moser uses a standard 5 bolt pattern, my guess is any of the new deeper pinion supports will fit, they may even have one by now. I just wasn't personally thrilled with a spacer.

    There are now 4 manufacturers of the generated 10" gear set, "your results may vary" :cool:



    Bob Meyer
    Meyer Race Cars / San Diego
    2015 Our 50th Anniversary
     
    #8
    Bob Meyer, Mar 10, 2015
  9. turbo69camaro

    turbo69camaro Member

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    How does the christman 10'' gear compare to the rest ??
     
    #9
    turbo69camaro, Mar 10, 2015
  10. KZ5 Blown SBC

    KZ5 Blown SBC Member

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    What do you guys look for when inspecting gears knowing when too put a fresh set in.
     
    #10
    KZ5 Blown SBC, Mar 10, 2015
  11. jay70cuda

    jay70cuda Well-Known Member

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    When it starts making a weird harmonic rattling towing it thru the pits. I never hear it besides towing it.
     
    #11
    jay70cuda, Mar 11, 2015
  12. blown1969camaro

    blown1969camaro Member

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    chrisman

    we had chrisman send strange a new gear(its from motive gear ) . strange set it up in a brand new ultra case

    we got 2 runs before it started making noise . and after 6 runs we did not want to tow it back from other end

    we got a toms 10 inch . and 30 runs later its quiet

    I would not run a motivegear/chrisman ever again
     
    #12
    blown1969camaro, Mar 11, 2015
  13. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    check

    I have always found rolling the tires backwards with the driveshaft disconnected is a good way to start feeling tight spots.
     
    #13
    Will Hanna, Mar 11, 2015
  14. turbo69camaro

    turbo69camaro Member

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    X 2 it will start with several tight spots then will have about 5 runs before it breaks
     
    #14
    turbo69camaro, Mar 12, 2015
  15. drn1013rd

    drn1013rd Member

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    Tight spots

    So how noticeable are the tight spots, would be hard to feel or very easy to tell?
    never checked this way just wondering?
    Thanks Don
     
    #15
    drn1013rd, Mar 20, 2015
  16. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    tight spots

    It will start where you can barely feel it rolling the tire and progress to the point it damn near sticks it. When you can feel it pretty good you only have a few runs left.

    Normally if it's just starting to get tight and I'm midway through a race, I will finish the race and fix it between races. If it's got a pretty good tight spot and you have most of the race to run, best to change it before it causes other damage from zinging the motor.
     
    #16
    Will Hanna, Mar 23, 2015

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