LS block...now bearing spec question...
#1
LS block...now bearing spec question...
Got the block hot tanked, getting ready to drop in the crank and check my bearing clearances. I'm not too happy with the condition of the block's matching main caps, they're a little rusty and pitted from sitting in the previous owners basement too long. So I'm going to swap the main caps from my old b18a1 over...in theory it should work fine. The bearing codes on the old block were BBBBB all across the board, and the new block lists CBBBC. So if I only retain the outside 2 caps (#'s 1 and 5) everything should still match up, correct?
#3
Re: Quick question before I start assembling my LS block...
Originally Posted by JDMFantasy2K
i wouldn't see why not but you gotta remember that all this stuff is used, so it's subjected to not being perfect anymore, so plastigaging is the way to go i'd say.
#4
Re: LS block...now bearing spec question...
Ok...here's the outcome...almost all 5 journals spec out to 0.001in. or 0.025mm. Number 3 journal was a tad looser, but not by much (it's supposed to be looser than #'s 1,2,4,&5).I've never had a motor spec out this tight before...should I just say ---- it and order new bearings, or assemble it tight? What would be the downside to running tight...other than spinning a bearing? :P
#5
Re: LS block...now bearing spec question...
im not 100% sure but i think if you switch main caps from a different motor they wont be 100% round anymore and have to get the mains honed . i would call a machine shop to check on this. if im wrong, you only waste a phone call and 5 minutes of your time.
#7
Re: LS block...now bearing spec question...
Originally Posted by y7turbo
im not 100% sure but i think if you switch main caps from a different motor they wont be 100% round anymore and have to get the mains honed . i would call a machine shop to check on this. if im wrong, you only waste a phone call and 5 minutes of your time.
Originally Posted by Ogubudiah
clearance specs are what they are to ensure proper lubrication.
#9
Re: LS block...now bearing spec question...
Originally Posted by Dweezil
That's why you don't move mains unless your having the block line honed after replaceing them.
#10
Re: LS block...now bearing spec question...
And the results are in...originals ftw! The originals were almost 1 thous. larger diameter than the other one's I tried. New plastiguage results were 0.0015" all across the board, except for the bastard #3 main bearing...still sitting at 0.001. Time to go to Honda and order up a smaller size bearing. :P
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ifly87
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08-30-2007 10:57 PM