Crank keys look like shearing

Discussion in 'PSI Superchargers Tech Questions' started by OwnBlock, Mar 21, 2010.

  1. OwnBlock

    OwnBlock Member

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    I have just taken the damper off and found the 2 keys are headed to shear mode.

    BBC snout on the crank

    Damper is steel centre with aluminium outer.

    16/71 32% over.

    P/G 10 pack, high clutch had popped the outer seal causing the piston to tilt and pressure the high pack on.

    2 shake down 2/3rd passes, 2nd one severe tyre shake on the shift from low to high.
     
    #1
    OwnBlock, Mar 21, 2010
  2. Mike Canter

    Mike Canter Top Dragster
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    What kind of damper bolt are you using and how much torque are you putting on it?
     
    #2
    Mike Canter, Mar 21, 2010
  3. Don Onimus

    Don Onimus New Member

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    shake

    Don't know about other stuff, except did you use a GOOD -8 or 9 bolt + washer torqued correctly? Try putting some fuel back into it @ the shift. will help calm it down a little, along with some other changes. Don
     
    #3
    Don Onimus, Mar 21, 2010
  4. aj481x

    aj481x Member

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    Heat treated keys?
     
    #4
    aj481x, Mar 21, 2010
  5. SoDak

    SoDak Active Member

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    Does the hub fit tight on the crank snout?
    Does the hub have a hairline crack in it?
     
    #5
    SoDak, Mar 21, 2010
  6. secondwindracing

    secondwindracing top alcohol

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    call Bob Auto and get his hub bolt and washer it is very cheap I think you torx it to #400..might be more i would have to look at my notes..Dave
     
    #6
    secondwindracing, Mar 21, 2010
  7. OwnBlock

    OwnBlock Member

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    Using a custom stud made from 4340, nut torqued to 160lb. (have a crank support with oil pump driven off the front of this)

    Damper fits nice and firm, no visible cracks.

    Never had this happen before.
     
    #7
    OwnBlock, Mar 21, 2010
  8. REEHL EQUIPMENT

    REEHL EQUIPMENT Authorized Merchant

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    Keys are too soft.
     
    #8
    REEHL EQUIPMENT, Mar 21, 2010
  9. promodracer

    promodracer Member

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    crank keys

    There was a thread on here some time back about special key material being hardened again to stop this. I think mine came from dmpe.
    I am sure someone knows where to get it.
     
    #9
    promodracer, Mar 27, 2010
  10. REEHL EQUIPMENT

    REEHL EQUIPMENT Authorized Merchant

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    Casale Engineering came up with hardened key stock for Austin Coil when they were running keyed cranks before splined cranks came out.

    I stock this keystock. $20.00 a 1 ft stick.

    Call 626 815-8815 9 to 5 M-F PST.
     
    #10
    REEHL EQUIPMENT, Mar 28, 2010
  11. Don Onimus

    Don Onimus New Member

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    crank bolt

    Bob changed it to 350# Don
     
    #11
    Don Onimus, Mar 28, 2010

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