engine building crew: how do I know what size main and rod bearings to get?

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08-20-2007, 01:05 PM

hustler

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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?

08-20-2007, 01:09 PM

magnamx-5

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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.

08-20-2007, 01:12 PM

hustler

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Quote:

Originally Posted by magnamx-5

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?

08-20-2007, 01:15 PM

m2cupcar

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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.

08-20-2007, 01:40 PM

Ben

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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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08-20-2007, 06:56 PM

akaryrye

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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.