Bearing clearances
#1
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Bearing clearances
What kind of bearing (rod and main) clearances are you guys running in the high hp setups (400whp+)?
I've read to shoot for 15-20 thousandths to be on the looser side aka safer
I've read to shoot for 15-20 thousandths to be on the looser side aka safer
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Re: Bearing clearances
Between. 0018 and. 0020. Id also recommend a ptw tolerance of at least. 0045. That's where im at with 475hp and so far so good. I had some ptw issues on the dyno with. 0035. I also had a rod bearing at about. 0015 that was on its way out fast with only 2500 miles. Good thing I found it b4 it spun
#4
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Re: Bearing clearances
Im just rebuilding a block that ate a bearing a few months ago. It had a good 15-20k miles on it then I think it over boosted.
Same pistons just fresh hone, rings, bearings, and crank.
Same pistons just fresh hone, rings, bearings, and crank.
#6
Re: Bearing clearances
Just so you know 15-20 thousandths is .015-.02. What you meant was one and a half to two thousandths .0015-.002. I would stay on the looser side of that tolerance though .0018-.002 especially since your running high boost. I'm assuming this is your sleeved motor i saw in the ls-t thread?
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#11
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Re: Bearing clearances
Your saying a good micrometer measuring the top of the cylinder isnt good enough? Its at the machine shop now so I'll know if its out of round
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Re: Bearing clearances
I like to run stock bearing clearences with or without oem bearings. If your not going to change oil weight then why run anything looser than stock specs ?
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Re: Bearing clearances
No its not. You should measure the entire bore from top to bottom and then again 90 degrees from the first with the dial bore gauge.
#14
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Re: Bearing clearances
more then stock rpms require more then stock clearance for more then stock cooling. don't overload the oil/bearings for a 200.000miles longevity your not going to use.
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Re: Bearing clearances
Yeah same here. 0.0020" to 0.0025" clearance on the mains and rods with 10W-30. Lasted 2+ years until it cracked a ring land during a cold night at the track. The motor did a 11.2 @ 130mph that night.
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