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Thread: cam and crank bearing choice.

  1. #1
    Join Date
    Jan 2011
    Posts
    12
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    Question cam and crank bearing choice.

    hi everyone.

    stripped my 430 down and am about to start rebuilding. ive taken measurements of the bottom end as follows (with a mic and a cmm btw so im confident in the accuracy)

    crankpin bearing journal

    #1= 2.2421
    #2= 2.2413
    #3= 2.2390
    #4= 2.2390
    #4= 2.2425
    #5= 2.2394
    #6= 2.2394
    #7= 2.2394
    #8= 2.2402

    if i go for the next sixe up +.01 this would push these out of tolerance .. am i better sticking with std ?

    main bearing

    #1= 3.2409
    #2= 3.2417
    #3= 3.2411
    #4= 3.2402
    =5= 3.2402

    again a +.01 will push these out of tollerance

    and finally the piston bores

    #1= 4.1913
    #2= 4.1920
    #3= 4.1921
    #3= 4.1914
    #4= 4.1917
    #5= 4.1917
    #6= 4.1913
    #7= 4.1915
    #8= 4.1894

    which i believe will be good with std rings.

    engine will be going in a show vehicle which will do <5,000 miles a year ...

    can someone help me in deciding if im better moving to a +.01 or.... as the engine will not be pushed hard or do many miles just rebuild with stock bearings ?

    any and all help and wisdom apreciated...


    Oli Bigfinger


    .

  2. #2

    Not Unusual

    There's nothing in the rule book that says all sizes must be exact. Look for odd marking characters on the caps. Some cranks are all over the place.

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