crank end play?

Discussion in 'PSI Superchargers Tech Questions' started by tfxhemi, Jan 8, 2008.

  1. tfxhemi

    tfxhemi New Member

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    Setting up new TFX with New Bryant crank. I have .011" crank end-play. This seems a bit excessive to me being a former Chevy guy. I know the TA hemi's seem to run alot more tolerances on everything. Does this sound like normal endplay for this combo? Any info would be appreciated. Thanks.
     
    #1
    tfxhemi, Jan 8, 2008
  2. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    high gear

    Did you check the end play with input shaft and trans installed and put it in high gear? That's when you need endplay. If your input shaft is too long, when it goes into high gear, it will eat up the thrust.

    As far as .011, I'll be honest, I've never checked it, but I would guess every motor I've worked on has at least that much. I always check it in high gear just to make sure it has some when installing a new crank, block or input shaft. Never went as far to put a dial on it, so I can't definitively tell you yes or no.
     
    #2
    Will Hanna, Jan 8, 2008
  3. Barry Paton

    Barry Paton Member

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    Crank end play

    Should be .010 - .012 I say your just right . Barry Paton
     
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    Barry Paton, Jan 8, 2008
  4. Ken Sitko

    Ken Sitko Super Comp

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    I don't like running under .008"; 11 thou sounds OK to me.
     
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    Ken Sitko, Jan 8, 2008
  5. Randy G.

    Randy G. Top Alcohol

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    I just put a new Bryant crank in one of my blocks last Saturday. End play in it was .0115". All of mine typically run .0100 to .0115. I put a Velasco crank in a BAE block and had to live with .014. The block measured fine but the crank was cut wide at the thrust. It survived.

    When installing you should remember to seat the crank and thrust bearing by tightening the center main to under 50# and banging the crank for and aft. Tighten the center main to spec and do it again. Because I am an anal person, I check the thrust when I set the crank in without a main cap, again after installing the cap and tightening the nuts hand tight. Again after banging it in at low torque (50#) and again after final torque and a couple more shots with the big hammer on both ends.

    Why do I do this? Because a hundred years ago when I used to run big block Chevy's we had occasional thrust main problems with cast iron blocks. Banging in the crank mysteriously solved the problem. While many may not agree with it, being very anal about setting in a crank will always be a part of my engine assembly program as well as being in the habit of checking ALL clearances, rod lengths, crank stroke (no matter who made it or what it says on the box), etc.
     
    #5
    Randy G., Jan 9, 2008
  6. AFC357

    AFC357 New Member

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    I don't know Randy, but I will definetely agree with him on "Never believe what the box says, check it, measure it, etc.." Been burned by this more than once! ;)
     
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    AFC357, Jan 9, 2008
  7. nitrohawk

    nitrohawk New Member

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    If you end up with not enough endplay I have put the thrust brg in a mill and machined the amount off to get the clerance right. There is plenty of brg. material. However if you have to do this you need to do more than one set so when you go to change at the races the brg. is already sized.
     
    #7
    nitrohawk, Jan 9, 2008

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