Need Help- please.

Discussion in '40- & 55-Series Tech' started by TM40, Oct 25, 2005.

  1. TM40

    TM40

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    Well after posting earlier about my vacuum routing, which ended up being correct, I have an issue I can't locate :crybaby: . I have very low power under around 1100 RPMs (no tach). When I try to take off at any lower RPMs the engine dies. Though when I am running down the road I have tons of power and can even do 70 mph just fine. Of course, in 4whl low it drives great off idle.

    Specs:
    10 degrees advanced (on the bb)

    Carb fuel mixture adjusted to highest vacuum at gauge (16 in/mg with a 1in. fluctuation)



    Mods that may cause problem:
    Downey Torquer Camshaft
    Holley 350
    Port/Polished Head
    Tri-Y headers
    All Smog comp. removed
    Fully Rebuilt Engine, Trans, T/C w/ all new bearings, seals, clutch assy., wiring harness, blah, blah,blah.
    Crane Ignition Module
    PS conversion
    Crane Oil-Filled HO Coil
    38.5x15 Swamper Boggers

    Basically I have rebuilt everything on the cruiser. I am wondering whether the tires are too big for factory gearing (4.11:1) and power of the engine? even though I have all these power increasing mods?

    or-

    Any other comments.

    Thanks for your help everyone :cheers: .

    ps- I also thought it may be a locking up wheel (rear is fully locked, front aussie, 4whl disc brakes) causing a tough to move vehicle but I can push it just fine.

    Oh, and thanks again :) .
     
  2. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    Sounds like the tires are a bit too big for the motor..
     
  3. TM40

    TM40

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    Do you think so? I am unsure... or I guess, disapointed. I thought for sure that the motor wouldn't have trouble with them after the improvements. hmm...
     
  4. stinkyfj60

    stinkyfj60

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    I would still look at gears... that would move the power band to where you need it.
     
  5. toddslater

    toddslater

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    Ditto on the gears...improvements on a 2F....is still a 2F.
     
  6. ken_79-fj40

    ken_79-fj40

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    I have 3.70's and 33's on mine and I can't just let out the clutch and go unless it's in low range. It's just geared too high. Obviously if I give it a little gas and ride the clutch a bit it's fine. If you want a lower 1st gear without changing the ring and pinion gears you could use a sm420 or 465 tranny. I know mine would be useless for any kind of slow speed crawling the way it is, yours probably is too.
     
  7. TM40

    TM40

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    Thanks guys. I guess I'll find myself covered in gear oil in the following months while I'm replacing gears. Thanks again for the responses.

    TM
     
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