Sprag assmebly replacement

Discussion in 'PSI Superchargers Tech Questions' started by 57Chev, Oct 22, 2018.

  1. 57Chev

    57Chev Member

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    What's a good indication that the Sprag or Inner and Outter race needs to be replaced? Or is it just a consumable item? I know its usually the Inner race is what wears first.



    This is for a Lenco Drive.
     
    #1
    57Chev, Oct 22, 2018
  2. Mike Canter

    Mike Canter Top Dragster
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    Yes, the inner race is consumable. If it is grooved or rough or blued then it needs to be replaced. They should look like new. Call Matt Moore at APT. phone 619.933.8636 They make excellent Lenco parts for less money.
     
    #2
    Mike Canter, Oct 22, 2018
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  3. TOL

    TOL Active Member

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    Does this APT company have a link?.......
     
    #3
    TOL, Oct 22, 2018
  4. Mike Canter

    Mike Canter Top Dragster
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    Let me find out tomorrow. We have been getting Lenco parts from Matt for awhile now and their quality is great. APT builds stronger parts for the Lenco reverser that stops that breakage problem.
     
    #4
    Mike Canter, Oct 22, 2018
  5. lucky devil

    lucky devil Member

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    interesting...
     
    #5
    lucky devil, Oct 23, 2018
  6. rb0804

    rb0804 Active Member

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    #6
    rb0804, Oct 23, 2018
  7. TOL

    TOL Active Member

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    Hey thanks Rob. If only they could come up with a sprag eliminator that did not need springs every 4-6 runs !.......
     
    #7
    TOL, Oct 23, 2018
  8. rb0804

    rb0804 Active Member

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    While we are on the topic, anyone have any info on the mechanical diode vs. the helo sprag vs. the sprag eliminator? Some years ago I seen a drag boat that had an air line to the rear portion of the case and they said it was an air assisted mechanical diode. Any info on this? Of all the problems with the Lenco, the sprag hasn’t been an issue for us.
     
    #8
    rb0804, Oct 23, 2018
  9. TOL

    TOL Active Member

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    You do realize of course now that you have made that public statement Mr. Murphy is going to send you a sprag failure? :). Take Care.
     
    #9
    TOL, Oct 23, 2018
  10. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    Never forget Smith's law - "Murphy was an optimist."
     
    #10
    Will Hanna, Oct 24, 2018
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  11. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    I'll add to what has been mentioned. On the element itself, you are looking primarily at the inner part and looking to see if the rounded part of the element is developing a flat spot. If enough elements lose this rounded edge, they lose the ability to lock and 'flip.' This flat spot is usually easy to see, it will be 'shiny' most of the time. If the shine is close to 50% or more across multiple elements, it's time to replace.

    I have heard of teams running an oversize inner race with a used element.

    If anyone wants some sprag eliminator assemblies, I have some for sale!
     
    #11
    Will Hanna, Oct 24, 2018

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