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Old 01-20-2014, 10:00 AM   #1
tcpip4lyfe
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Default Crank ground 10-10 - Bearing question

New to this. My machine shop left me a voicemail that said, "Your crank is going to be 10-10"

Based on some googleing, that means that the crank and rod grind was .010 which = .2540 mm. Going to get oversized King crank/rod bearings.

For the crank, I would need to get the .25mm oversized ones right? Because .2540mm - .2500mm = .004 mm which should be close enough?

For the rods, the same thing? .25mm oversized?
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Old 01-21-2014, 12:51 AM   #2
subyswamper
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Yes, your assumptions are correct. .010" = .25mm . This just means that you need to get the bearings for rods and mains in that size rather than standard. You may also have to have your machinists cut the thrust surface of the crankshaft to give correct thrust tolerance. Most oversized bearings have a built up thrust surface. I have built many n/a engines with no issues with running a crank that has been turned 10/10.
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Old 01-21-2014, 06:29 AM   #3
tcpip4lyfe
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Perfect. Thanks.
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Old 01-21-2014, 07:21 AM   #4
Barney145
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As stated, if your .25 undersize main set has an oversized thrust you need to make sure your machine shop is aware of this before they grind it. They may want to have the bearing in hand so they can measure it or they may just go off the catalog spec. If they do a lot of Subaru's they probably know this already but just in case.
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Old 01-21-2014, 10:17 AM   #5
Turn in Concepts
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Gotta ask - is this a stock subaru crank or something special?

We run into this here. The stock crank is so cheap just replace it. Once you do the math on grinding, balancing and polishing the old one a brand new one isn't much.
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