Big block chevy leakdown or fuel system info.

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Outlaw Funnycar, Sep 9, 2018.

  1. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
    Staff Member

    Joined:
    May 6, 2003
    Messages:
    6,409
    Likes Received:
    66
    Back in my dad's mud racing days, they ran Mallory Super Mags and when the "mag pin" would shear, it would go from running normally to shooting flames out of the headers. I really haven't been around many Super Mags, nor did I ever get a deeper explanation of the problem (was a kid at the time). I would assume it has to do with the trigger and points.
     
    #21
  2. SoDak

    SoDak Active Member

    Joined:
    Dec 29, 2006
    Messages:
    1,513
    Likes Received:
    3
    The roll pin that connects the gear to the shaft is the common one to shear or partially shear and this causes the ignition timing to retard. Plenty common in the BBC world. I broach the gear and key the shaft so this is not a concern for our engines anymore.
     
    #22
  3. blownapex

    blownapex Member

    Joined:
    May 25, 2006
    Messages:
    483
    Likes Received:
    3
    has the blower been restripped
    i restripped a 14/71 and it ran real weird
    i put the rotors in swapped (left for right)
    fuel was coming out aerated nozzles
    when i called bill barrett he imidiatly knew what i did
    thats the last one i stripped
     
    #23

Share This Page