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Thread: rod/main bearing size issue

  1. #1
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    rod/main bearing size issue

    so ive been having an engine built for awhile now, ran into a issue, was told i need .10/.10 rod and main bearings but cant find those, do they exist? seems to be a non standard size the least im seeing is .25, im guessing that was since there was some debris that damaged thecrank and that was the min resize possible but is there anywhere can order the bearings?

  2. #2
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: rod/main bearing size issue

    Engine bearings are sized in metric and not inches anymore at least for our application.

    If you mean .010 that would equal .25mm Big difference between .1 and .01
    .020 is .5mm
    .030 is .75mm
    .040 is 1mm

    Nobody makes them anymore, used to be able to get .026mm which is .001 and was great for a situation where the crankshaft was just out of spec but not needing a full .010 ground off to make it round again. Those have been unavailable for several years now though.

    Northern auto parts is far from the cheapest place to find them but they do have everything in stock.

    https://www.northernautoparts.com/EC...ubmit=Continue
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    Re: rod/main bearing size issue

    "If you mean .010 that would equal .25mm Big difference between .1 and .01 "
    maybe thats it he said it was cut 10/10 but im just not familiar with the engine building lingo im sure thats probably the case

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    Re: rod/main bearing size issue

    looking at that link above , and the bearing sets listed,

    I might wanna use it as a list of part numbers to research better
    - as there is no mention of any bearings being for or not for early vs late engines with the filleted cranks..
    AND they list the 2.2 dohc mazi motor as one the rod bearings ALSO fit..and that's a known ,wrong

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    Re: rod/main bearing size issue

    i ordered some from fwd so should be all good now, i just didn't know the .010 = .25 thing since i dont normally build engines

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    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: rod/main bearing size issue

    Quote Originally Posted by Dr. Johny Dodge View Post
    looking at that link above , and the bearing sets listed,

    I might wanna use it as a list of part numbers to research better
    - as there is no mention of any bearings being for or not for early vs late engines with the filleted cranks..
    AND they list the 2.2 dohc mazi motor as one the rod bearings ALSO fit..and that's a known ,wrong
    That is a new one for me ??

    Quote Originally Posted by Fox View Post
    i ordered some from fwd so should be all good now, i just didn't know the .010 = .25 thing since i dont normally build engines
    Its all good. I work in a machine shop so numbers/decimals and conversion between inches/imperial and metric are a daily thing for me. .1 or .01 or .001 can have catastrophic results if you fudge a key stroke entry.

    If it was not for the aerospace industry the US would have gone to the metric system decades ago.
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  7. #7
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    Re: rod/main bearing size issue

    the cryco / mazzi dohc 2.2's used unique double weighted cranks and unique connecting rods that used a bearing that is something like .020 narrower than a regular 2.2 rod bearing
    I believe the first pic is the 2.2 crank we know
    second pic is not a mazzi crank .. but is similar in the design & placement of the weights

    double weighted distributes stress' evenly to each side of the main caps unlike our standard "single weight" 2.2 cranks
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Dr. Johny Dodge; 07-01-2022 at 12:27 PM.

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    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: rod/main bearing size issue

    The masi engine uses a different rod bearing for the "casar" connecting rods I know about.

    This tidbit here
    as there is no mention of any bearings being for or not for early vs late engines with the filleted cranks..
    if you were referring to the standard 8v chrysler crankshaft as there being a difference between early and late ?
    1994 Shadow Sedan. 2.2 N/A, A568 400,000 miles. "the science experiment"
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  9. #9
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    Re: rod/main bearing size issue

    later 2.2 cranks have a filleted journal the early cranks lack
    thus the bearing must allow for it at the edges

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