Hemi rod bearing issue

Discussion in 'PSI Superchargers Tech Questions' started by Afuelperson, Feb 25, 2022.

  1. Afuelperson

    Afuelperson New Member

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    A fuel motor rod bearings wearing on the edges with plenty of Babbitt in the center
    It’s the upper bearing it’s a hemi we just found a clutch problem it wasn’t fully engaging
    And rpming pretty quick not to sure if this would cause the problem or not thanks for any help
     

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  2. jay70cuda

    jay70cuda Well-Known Member

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    Is it a new crank. I've seen where they didn't relief the crank radius wide enough or with the proper radius. Had a repair once do that after it came back
     
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  3. max706

    max706 New Member

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    I’m not sure about the crank I think it was used and probably cut I’ll have to check
     
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  4. max706

    max706 New Member

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    I forgot to mention it’s all 8 of the top rod bearings and the main guy and tuner has been in top alcohol since the 80s starting with blowers then moving into A fuel a
     
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  5. max706

    max706 New Member

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    The crank is new only a hand full of runs on it
     
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  6. Bob69

    Bob69 Member

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    What type of oil and pressure you are running
     
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  7. WIDEOPEN231

    WIDEOPEN231 Member

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    Which bearing are you running? I know with Clevitte we run V series.The M's we ram with blower are too soft.
     
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  8. Afuelperson

    Afuelperson New Member

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    They are running the m’s
     
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  9. Graham Brown

    Graham Brown Member

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    What bearing clearances and oil pressure/viscosity?
     
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  10. MaggiFinn

    MaggiFinn New Member

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    Lets wake this thread up, any updates OP?

    How is the main thrust?
    Can the clutch chatter when not engaging fully, violently shaking the crank back and forth?
    If the crank journals are straight and the fillet radius is not too big, could the wear be an indication of the pin end of the rods rocking front to back, pinching the bearings?
    Tire shake?

    Perhaps piston guiding the rods isn't as crazy idea as I thought.
     
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  11. td3829mk

    td3829mk Member

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    Put V’s in and check. I tried M’s once with similar result. Now only use an M on the thrust.
     
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  12. WIDEOPEN231

    WIDEOPEN231 Member

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    Running the M's is your problem I am pretty sure. I have cpl dozen sets of M's and we still had to buy the V's because M's will not live in A/fuel
     
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  13. secondwindracing

    secondwindracing top alcohol

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    Narrow your bearings
     
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