All Motor / Naturally Aspirated No power adders

b18a1 bearing spec question

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Old Jan 28, 2007 | 11:59 AM
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89EF_Turbo's Avatar
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From: Carbondale, PA, USA
Default b18a1 bearing spec question

I just finished plastigauging my b18a1 crank assembly using King Alecular main bearings (pretty much a standard set) and came out with #'s 1, 2, and 4 with 0.025mm (or 0.001"), #5 came up at 0.028mm, and #3 at 0.028mm. Most of the time I just match the honda number/letter combos and order stock bearings, but this time I just couldn't afford the dealer's price tag. They're a bit tighter than I usually build my motors (I usually go towards the looser end on the spectrum to load the crank right away), and honestly I've never had one come up this tight before. Should I even bother to run with these clearances, or change them all out for a larger spec?
According to my Honda service manual, #'s 1,2,4, and 5 should be 0.024-0.042mm, and #3 0.030-0.048mm.
I don't want to risk spinning a bearing as soon as I start it up or starving the motor of oil...what would you do?

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Old Jan 28, 2007 | 12:49 PM
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91SiZ6's Avatar
 
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From: California, United States
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I swear someone posted this exact same question just a few weeks ago.
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