Bearing clearance ?'s
03-01-2005, 10:16 AM
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Launching!
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Bearing clearance ?'s Specifically main bearings. We had the machine shop we use set them at .0021 to .0025 in this motor we are doing. Is this where they should be? I just had someone tell me earlier this am, at another shop, that with an LS1 they have to be no more than .0019, preferably .0012-.0018 to make proper oil pressure. Personaly, I think the dude was full of ****, or just too picky, what's your opinions?
03-01-2005, 10:29 AM
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You'll be alright with those clearances, but you'll have lower oil pressure.
I have .015-.020" on my mains, a a little bigger spread (up to .025+") on my rod bearings due to some liberal polishing.
Either way you'll be fine, just don't be surprised if the oil pressure is lower.
Ben
I have .015-.020" on my mains, a a little bigger spread (up to .025+") on my rod bearings due to some liberal polishing.
Either way you'll be fine, just don't be surprised if the oil pressure is lower.
Ben
Originally Posted by PHANTA-Z
Specifically main bearings. We had the machine shop we use set them at .0021 to .0025 in this motor we are doing. Is this where they should be? I just had someone tell me earlier this am, at another shop, that with an LS1 they have to be no more than .0019, preferably .0012-.0018 to make proper oil pressure. Personaly, I think the dude was full of ****, or just too picky, what's your opinions?
03-01-2005, 10:32 AM
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The clearance is always personal preference. On a aluminum block we currently shoot for .0011-.0016. On a iron block below 1000hp we shoot for .0021-.0025. On a drag engine above 1000hp we would start to loosen the clearance up as high as .003.
Kurt
Kurt
03-01-2005, 02:30 PM
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Thats cool, sounds like we'll be ok either way, but from now on I will specify to my machine shop no more than .002. Thank you for the info. As always 
LS1tech.
LS1tech. 
03-01-2005, 05:26 PM
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Originally Posted by 1FASTLS
I have .0025 on rods and main and cary 52 cold and 40 hot on oil pressure.
On a side note, where did you pick up those Motron 60# ?
03-01-2005, 07:04 PM
#7
The mains are run tighter ( in general) on aluminum blocks because the aluminum expands more than an iron block. I am putting together a 403 aluminum with about 1.6 clearance and the crank spins very easily.
