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Putting pistons in backwards

Discussion in 'LS1, LS2, LS6, LT1, SBC Turbo and other GM Specfic Turbo Tech' started by H.P.Ranch, Dec 31, 2013.

  1. H.P.Ranch

    Joined:
    Sep 2, 2011
    Any LS guys tried this yet for more HP.
     
    H.P.Ranch, Dec 31, 2013
    #1

  2. Krandmar

    Joined:
    Dec 16, 2013
    Is this about rist pin offset?
     
    Krandmar, Dec 31, 2013
    #2

  3. H.P.Ranch

    Joined:
    Sep 2, 2011
    YES it is.
     
    H.P.Ranch, Dec 31, 2013
    #3

  4. Krandmar

    Joined:
    Dec 16, 2013
    I don't know about the specifics of an LS but in the 70's that was a trick we sometimes did on SBCs. The reverse offset wrist pins set up did seem to make a little noise. I don't know it was a good change or not. Lots of aftermarket pistons skip the offset so the pistons are not dedicated to one side of the engine.
     
    Krandmar, Dec 31, 2013
    #4

  5. 55Chevy

    Joined:
    Nov 9, 2013
    Wouldn't there be an increase in the side loading of the cylinder if you reversed the pistons? I guess my question would be "Why" the engineers offset piston pins in the first place? There must have been a mechanical advantage for the offset. JD
     
    55Chevy, Dec 31, 2013
    #5

  6. Krandmar

    Joined:
    Dec 16, 2013
    From memory, the offset is only to reduce noise. The factory offset give slightly less mechanical advantage for transmitting the piston’s force to the crank. Eliminating or reversing the wrist pin offset was claimed to give a slight mechanical advantage. IIRC there was something like 1% gains claimed on a high performance SBC.
     
    Krandmar, Dec 31, 2013
    #6

  7. H.P.Ranch

    Joined:
    Sep 2, 2011
    Also less thrust less resistance more HP. At the Ranch. Welcome Race Fans!!! :joyous:
     
    Last edited: Dec 31, 2013
    H.P.Ranch, Dec 31, 2013
    #7
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