Engine won't run without transmission behind it.

Discussion in 'PSI Superchargers Tech Questions' started by Money Shot, Sep 16, 2012.

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  1. Money Shot

    Money Shot Member

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    Broke tranny last weekend. Tried to start engine just to make sure it was ok. Engine kicks back like timing is too high. Timing is at 25 degrees. Anybody ever had this issue?
     
    #1
    Money Shot, Sep 16, 2012
  2. secondwindracing

    secondwindracing top alcohol

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    when your trans broke did the rpm's go high? dave
     
    #2
    secondwindracing, Sep 16, 2012
  3. Money Shot

    Money Shot Member

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    Not too bad

    9400. Not too bad
     
    #3
    Money Shot, Sep 16, 2012
  4. Mark Leigh

    Mark Leigh Member

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    Have you tried turning it over with a wrench ? Pull the plugs out .
     
    #4
    Mark Leigh, Sep 16, 2012
  5. jody stroud

    jody stroud ZOMBIE Top Dragster

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    Trans broke under load..... even at only 9400 rpms, she is hurt.
     
    #5
    jody stroud, Sep 16, 2012
  6. Money Shot

    Money Shot Member

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    Motor

    I don't think motor is hurt. Pulled plugs and everything looks good. Ran valves and everything is good. Motor turns over fine by hand. I've never tried to start a blower motor without a transmission behind it. Motor will start then die and kickback on the blower starter. Friend of mine said they need a load (trans) behind them.
     
    #6
    Money Shot, Sep 16, 2012
  7. Dave Koehler

    Dave Koehler Member

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    Please tell the attending your starting procedure, step by step.
     
    #7
    Dave Koehler, Sep 16, 2012
  8. Money Shot

    Money Shot Member

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    Starting Procedure

    Squirt alky into hat. Engage Blower starter. Let spin for a
    Second or two then pull kill switch back and it usually starts right up. Now with no transmission behind it, it starts then dies and kicks back on the blower starter.
     
    #8
    Money Shot, Sep 16, 2012
  9. secondwindracing

    secondwindracing top alcohol

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    anytime a trans breaks that motor unloads hard if it was mine I would not even think of trying to start it untill I tore it down and check everthing..Dave
     
    #9
    secondwindracing, Sep 16, 2012
  10. TD1770

    TD1770 New Member

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    Would just seam to me that with out the rotational mass on the rear of the crank it cant carry its self pass the compression cycle. The blower on the other end of the crank is working like a compression brake
     
    #10
    TD1770, Sep 16, 2012
  11. Fuel Cars

    Fuel Cars AA/AM

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    I've started my blown SBC plenty of times without the tranny, just play it easy on when throttling the motor, it'll rev up much faster.

    Not sure what type of tranny you're running but if it's uses a clutch, the motor doesn't see the tranny when clutch is engaged.

    Sounds to me like you hurt the motor.
     
    #11
    Fuel Cars, Sep 17, 2012
  12. Money Shot

    Money Shot Member

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    Motor

    Gonna put transmission back in it Thursday. Will let y'all know what happens. Thanks for the input.

    Randy
     
    #12
    Money Shot, Sep 17, 2012
  13. Critical Mass

    Critical Mass Member

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    Money Shot,
    Have you checked your timing? I'm sure you did, but I want to cover all the bases. When a motor unloads or stops fast like that it can effect your timing especially if you are using a mag. Joe
     
    #13
    Critical Mass, Sep 17, 2012
  14. Money Shot

    Money Shot Member

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    Timing

    Yep, double checked timing. I suppose I should clarify this is a 500ci KB Veney Hemi making 42lbs of boost @28od with a Mag44 ignition.

    Randy
     
    #14
    Money Shot, Sep 17, 2012
  15. Will Hanna

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

    make sure it didn't shear the pump drive shaft. maybe it's dying when it runs out of prime. i have never heard of a blower motor needing a transmission to run.

    if you have a 8973 or grid hooked to it, have you tried to start it straight off the mag just to make sure it's not some sort of wiring deal?
     
    #15
    Will Hanna, Sep 17, 2012
  16. john348

    john348 Top Alcohol

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    Did you check the keyway on the bottom of the mag
    sometimes they shear
     
    #16
    john348, Sep 17, 2012
  17. Money Shot

    Money Shot Member

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    8973

    Yep, tried to fire it straight off the mag and checked pump rod as well. Weird deal.
     
    #17
    Money Shot, Sep 17, 2012
  18. Money Shot

    Money Shot Member

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    Keyway

    Have not checked keyway. If keyway was stripped though wouldn't the timing be off?

    Randy
     
    #18
    Money Shot, Sep 17, 2012
  19. lucky devil

    lucky devil Member

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    Check the snout on the blower. I have seen a couple break , in this situation. Just a thought
     
    #19
    lucky devil, Sep 17, 2012
  20. Money Shot

    Money Shot Member

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    snout

    Pulled belt off and turned blower by hand. Turns fine. Thought the same thing myself.
     
    #20
    Money Shot, Sep 17, 2012
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