bearing clearance problems

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bearing clearance problems

Post  cooter on March 29th 2012, 12:01 am

im putting a small block chev together using a dart splayed cap block and scat 9000 crank, The problem is i am using King bearings and the front main has 3 thou clearance but the center 3 have 4 thou clearance and the thrust bearing has 3 thou clearance. The crank measures good so it must be the block but i havent measured it yet, I just want to confirm that if i use an undersized bearing on any main, i have to do the same on all other mains.

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Re: bearing clearance problems

Post  Frank Merkl on March 29th 2012, 12:58 am

time for a line hone
Frank
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Re: bearing clearance problems

Post  cooter on March 29th 2012, 8:01 am

thats what i thought. Gotta love spending money on a brand new block! Quality at its finest,

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Re: bearing clearance problems

Post  bbf-falcon on March 29th 2012, 9:06 am

Frank Merkl wrote:time for a line hone
Frank



Yep,I agree

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Re: bearing clearance problems

Post  LivermoreDave on March 30th 2012, 7:21 am

As others have mentioned, the main bearing housing bores may need some attention. On another note, it doesn't seem to matter how you achieve your desired bearing clearance (as you mentioned) as long as you arrive there!

What's up Rick ......... Go Cardinals?
Go Cats!!!! Laughing
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Re: bearing clearance problems

Post  bbf-falcon on March 31st 2012, 7:05 am



What's up Rick ......... Go Cardinals?
Go Cats!!!! Laughing
Dave[/quote]

sup brother Very Happy

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Re: bearing clearance problems

Post  cooter on April 6th 2012, 9:41 pm

400 bucks later the block is line honed and my clearance with a 1 under bearing is 3 thou. Thanx for the replies

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Re: bearing clearance problems

Post  dfree383 on April 9th 2012, 12:26 am

cooter wrote:400 bucks later the block is line honed and my clearance with a 1 under bearing is 3 thou. Thanx for the replies

Its very common on a new block to have to do this, they are deliberatly undersized to allow you to get the desired fit.
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Re: bearing clearance problems

Post  cooter on April 9th 2012, 8:06 am

i dont mind if the journals are undersized but it would be nice if the journals were all the same size. The same bearings in 2 different journals gave me 1 thou different clearances.

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Re: bearing clearance problems

Post  bbf-falcon on April 10th 2012, 9:28 pm

Just a big IMPORTANT part of engine building. Just do it right and get it done.Smile

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Re: bearing clearance problems

Post  cooter on April 10th 2012, 10:15 pm

nothing but time and money! Thanx for the replies

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