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    What is a Pro Journal?

    One of the most common questions we get at LC engineering is “What is a pro journal? Is it better than a Toyota journal? What bearings do I need?” Well lets try to clear the issue up a bit. During the R&D process on our crankshafts LCE found that we could modify the rod journal and have the ability to use a Chevy style rod bearing, giving us better bearing quality, selection and availability. So anytime you see “Pro Journal,” it’s referring to this modification.

    One important thing to remember is that if you run a Pro Journal crankshaft, then you need Pro Journal rod bearings and connecting rods. It also goes the other way; when running Pro Journal rods you must run the Pro Journal crankshaft and rod bearings. So when you select your parts be sure to match up the journal types.


    This Table can help you understand the difference in sizes.

    ROD BEARING SIZE
    CRANKSHAFT PRO JOURNAL RANGE
    CRANKSHAFT TOYOTA JOURNAL RANGE

    Standard Bearing

    53.3146 mm - 53.34 mm

    2.099 inches - 2.100 inches

    52.988 mm - 53.000 mm

    2.0861 inches - 2.0866 inches

    .25mm (+.010")

    53.0606 mm - 53.086 mm

    2.089 inches - 2.090 inches

    52.701 mm - 52.711 mm

    2.0748 inches - 2.0752 inches

    .50mm (+.020")

    52.8066 mm - 52.832 mm

    2.079 inches - 2.080 inches

    52.414 mm - 52.422 mm

    2.0635 inches - 2.0638 inches

    .75mm (+.030")

    52.5526 mm - 52.578mm

    2.069 inches - 2.070 inches

    52.127 mm - 52.133 mm

    2.0522 inches - 2.0524 inches

    1.00mm (+.040")

     

    51.840mm – 51.844mm

    2.0409 inches – 2.041 inches

    How to differentiate Pro Journal H-Beam Rods & Toyota Journal H-Beam Rods:

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