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Old 08-20-2007, 02:05 PM   #1
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Default engine building crew: how do I know what size main and rod bearings to get?

and thrust washers too. I can get standard, +10, and +20.


Doesn't the guy at the machine shop need to figure this out, rather than pre-ordering?
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Old 08-20-2007, 02:09 PM   #2
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If there is no machine work to be done standard is the **** if there is then measure after it is done i assume the shortblock you have has no damage right.
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Old 08-20-2007, 02:12 PM   #3
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Quote:
Originally Posted by magnamx-5 View Post
If there is no machine work to be done standard is the **** if there is then measure after it is done i assume the shortblock you have has no damage right.
I still don't have one. Since I'm going with a 99/00 motor, do I need to provision anything to take care of the dreded main problem?
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Old 08-20-2007, 02:15 PM   #4
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If you're having an engine builder do the work, then YES - it's his job to measure the crank and choose the bearings. That's what you're paying for.
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Old 08-20-2007, 02:40 PM   #5
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If you're paying for the work to be done, then you're paying for the builder to deal with it for you.

Search on miata.net for the 99-00 thrust bearing problem for the fix.
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Old 08-20-2007, 07:56 PM   #6
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like it has been said, if the crank is scuffed, scratched, or otherwise damaged a little it will need to be ground down a bit and need an oversized bearing. Bearing sets will include the thrust washer and I was under the impression that the main reason for any problems was that the factory supplied the motors with thrust washers that were too small and allowed too much tolerance.
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Old 08-20-2007, 08:25 PM   #7
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Markp or some of the NB guys would know, maybe pm them.
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Old 08-21-2007, 10:54 AM   #8
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I'm just letting the machine shop guy **** with it. Minus whale go in there like a baller.
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