Engine Block-Main Bearing HOUSING Bore Spec-STD.-for 55MM | FerrariChat

Engine Block-Main Bearing HOUSING Bore Spec-STD.-for 55MM

Discussion in 'Technical Q&A' started by 335s, Oct 17, 2018.

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  1. 335s

    335s Formula Junior

    Jan 17, 2007
    870
    SF Bay Area
    Full Name:
    T. Monma
    #1 335s, Oct 17, 2018
    Been 25, or almost 30 years, since I did this size last time, I can't find the build book for last one I had to line bore....
    Just getting old I guess....

    What I require is: the crankshaft's main bearing galley bore spec for an EARLY 250(type 112, I THNK???),
    as opposed to the 128/168 series 250 engines which use a 60MM Main bearing crankshaft PIN, and a housing bore of 2.5062"-2.5067"(5 "tenths" variance only)-63.657-63.670MM for the metrics out there...

    These EARLY cars used 55MM main bearing crankshaft pins. Therefore, the HOUSING BORES are NOT the same-they will be/ought to be/should be, smaller....

    I need THIS spec: the HOUSING bore ID(from 12 to 6) for a "55MM crank block" in standard size-no under- sizes or over-sizes needed here....

    Thanks in advance fellas....
     

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