Engine won't run without transmission behind it.

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

Page 1 of 2
  1. Money Shot

    Money Shot Member

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Feb 10, 2004
    Messages:
    2,894
    Likes Received:
    7
    when your trans broke did the rpm's go high? dave
     
    #2
    secondwindracing, Sep 16, 2012
  3. Money Shot

    Money Shot Member

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    Not too bad

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

    Mark Leigh Member

    Joined:
    Mar 9, 2010
    Messages:
    446
    Likes Received:
    2
    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

    Joined:
    Sep 3, 2007
    Messages:
    854
    Likes Received:
    15
    Trans broke under load..... even at only 9400 rpms, she is hurt.
     
    #5
    jody stroud, Sep 16, 2012
  6. Money Shot

    Money Shot Member

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Sep 10, 2004
    Messages:
    443
    Likes Received:
    14
    Please tell the attending your starting procedure, step by step.
     
    #7
    Dave Koehler, Sep 16, 2012
  8. Money Shot

    Money Shot Member

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Feb 10, 2004
    Messages:
    2,894
    Likes Received:
    7
    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

    Joined:
    Oct 5, 2011
    Messages:
    2
    Likes Received:
    0
    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

    Joined:
    Aug 20, 2003
    Messages:
    306
    Likes Received:
    8
    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

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Aug 5, 2010
    Messages:
    169
    Likes Received:
    4
    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

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,706
    Likes Received:
    132
    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

    Joined:
    May 29, 2003
    Messages:
    1,348
    Likes Received:
    5
    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

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    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

    Joined:
    Apr 14, 2008
    Messages:
    283
    Likes Received:
    11
    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

    Joined:
    Apr 13, 2009
    Messages:
    244
    Likes Received:
    2
    snout

    Pulled belt off and turned blower by hand. Turns fine. Thought the same thing myself.
     
    #20
    Money Shot, Sep 17, 2012
Page 1 of 2

Share This Page





XenPorta 2 PRO © Jason Axelrod from 8WAYRUN.COM