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Thread: JE Piston Tech

  1. #1

    JE Piston Tech

    I am a tech at JE Pistons and can hepl with piston related issues.

  2. #2
    Member JUNIOR BUILDER
    Join Date
    Feb 2008
    Location
    Childers Australia
    Posts
    99

    piston pin end float

    Hi I am in what I see as an unenviable position.I purchased Probe BBChev pistons aws they were the only ones to make a piston of the specification I was seeking & have been trying to get this engine final assembled.When I put the piston pins & spirolocs in I noticed what I considered excessive end float.I contacted Probe & asked what this end float specification should be,& was given piston to bore specs.I again asked for end float specs & was told that "All our pistons are ready to run & the clearances are already setso that the customer does not have to worry about it"A very disturbing statement in itself.To which I said that Iwas not satisfied with that answer & requested the spec,twice more only to have me Emails read & ignored.I have .010" of end float & am wondering what,apart from not ever using Probe anything,to do.Thanks in advance for your time.Mark

  3. #3
    With our parts a .010 endfloat is accectalbe but at the end of the tollerence. It would be an expensive fix but if you can find a pin longer, it can be cit down to .005 longer then the ones you have.

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    I have to agree with ARUSSEL on this one, and i'm a JE user, but have supplied Probe pistons to a couple of customers. .010 is totally acceptable for end clearance on the pins. There has to be something pretty bad wrong to push a pins past a spiral lock, such as too much piston clearance, bore out of SQ. with main bores, etc. I would assemble it and not worry about it. I've run more side clearance on blown alcohol applications with alum or nylon buttons and no problems.


    JMO

    Zip.

  5. #5
    Member JUNIOR BUILDER
    Join Date
    Feb 2008
    Location
    Childers Australia
    Posts
    99
    Finally got a reply from probe,the endfloat is supposed to be between .005"& .020" according to the sales manager.That puts what I have in a good position.The clearance specification seems to me at least, to be very large compared to anything I've seen anywhere,which is what I find disturbing.Thanks for the replies I had considered longer pins,but Where to get them?& prehaps some type of shim,or would that cause other problems?On the other hand considering the replies just run them as is,after all they are at the top end of what seems to be considered ok tolerance & as always a little loose is always better than a little tight.


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