Rod/Main Bearings Question.
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Rod/Main Bearings Question.
SO i will be installing New Bearing on my H22 motor. ITs a JDM motor that a bought about a year ago.. and Well...im rebuilding it, to get it run OEM. SO i used the service manual and figured out which bearings to buy. A friend of mine told me that i should buy a size smaller bearing then the one that was coded off from the block and crank, etc. He says this because it is a used morning(JDM H22) and because i plan on micropolishing the crank. HE says this rule of thumb worked for him when he built his b16. I know that most of you would say just measure it, but i dont have measuring instruments for this. I hope i explained my situation good. any help is appreciated.
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Re: Rod/Main Bearings Question. (bb4socal)
Well, I would say rent the equipment needed. Or have a machine shop gauge it. you never want to just take advice and go with it with any doubt. You'l end up getting the short end of the stick. Trust me! I would get that crank checked, and if all is well, buy an oem bearing set for the rods.
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Re: Rod/Main Bearings Question. (s10cky)
i definetly plan to buy OEM bearings for mains and rods. Well.. ive gotta figure out where to get these tools. Basically all i need is A micrometer and telescoping guages right?
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smaller bearing = more oil
larger bearing = less oil, longer lasting
At least that's what I've read. I'm no block expert, correct me if I'm wrong.
larger bearing = less oil, longer lasting
At least that's what I've read. I'm no block expert, correct me if I'm wrong.
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From what I've been learning, about .0015" on the mains and .0017" on the rods is pretty good. The extra clearance on the rods acts as a bit of a combustion cushion.
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when you say 15 and 17 thousanths....do you mean thats good for oil clearance?? Also...i plan on measuring the journals of the crank and bores of the rods. If i can remember i measure the journals then measure the bores and then Do a lil math right? Bores minus(-) journal right? then that will give me how much space the bearing must take up, minusing the oil clearance. Some one shoot me in the right direction a bit. I lknow your thinking ...take it to a shop....but i honestly can do this...just need a lil guidance. The manual doesnt tell me much about which bearings to buy when your doing it to a used motor. It says follow the code on the crank then by corasponding bearings to that, then plastgauge. Then if that bearing doesnt work get new ones. But i dont think bearings are returnable. so i want to avoild all that if i can. Let me know guys thanks!!
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I bought a set of green bearings to Plastigage with, then ordered what I needed.
Yeah, those are supposed to be good for oil clearances...per professional builders on this site. I have all of mine at .0015".
Rod bore ID - Journal OD + desired clearance = bearing thickness needed. There's a bearing thickness chart in the All-Motor section.
Yeah, those are supposed to be good for oil clearances...per professional builders on this site. I have all of mine at .0015".
Rod bore ID - Journal OD + desired clearance = bearing thickness needed. There's a bearing thickness chart in the All-Motor section.
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akura404
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07-31-2006 01:18 PM