Gonna be building the lbz and was wondering about the stock crank. Is it gonna hold up? What needs done to it to help go along with the build?
LBZ: Stock crank in build
- Thread starter aggar
- Start date
it will be fine. put a key in place of the dowel pin that aligns the ckp reluctor wheel and balancer and it will be fine.
super diesel
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Depending on how much power your going to lean on it with. I would make sure you have about .0028-.003 clearance in the main bearings too. I believe under the added stress, it's helping the crank flex a little, squishing out the oil jacket and then it makes contact with the bearing (caused my spun bearing I believe because I could see the contact marks 
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i know if you cryo the crank it def helps with the longevity and strength of it. Helps to align the molecules in the steel so it makes it stronger or something like that. I've seen a lot of people do it.
super diesel
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Unfortunately, cryo will allow it to move (warp) then a regrind will be in order. If this treatment is needed get it Metalaxed. Cryo does nothing for the strength and most certainly will not relieve the stress. Metalax will. Cryo is only helpful while the crank is being made and then it can be ground to tolerance.
x2. Cryo'ing stuff is sooooo overrated IMO. It sounds fancy and special and like it "should" help and make things stronger, but in reality, it doesnt really do anything in our applications where we are looking to "strengthen" stock pieces such as input shafts, cranks, rods, etc...
ben
Depending on how much power your going to lean on it with. I would make sure you have about .0028-.003 clearance in the main bearings too. I believe under the added stress, it's helping the crank flex a little, squishing out the oil jacket and then it makes contact with the bearing (caused my spun bearing I believe because I could see the contact marks
Bingo!
I really think Bearing clearences (lack of) and loose crank thrust are the two main causes of crank death.
A lot of busted cranks had main bearings wore out IIRC. Makes me wonder if that allows heat to build up and weakens the crank. Dunno. We haven't busted one yet, so I go by what I hear.
Has anyone broke an lbz or lmm crank yet? Just wondering because of miles and abuse before the build. Alot of the big hp trucks seem to have lb7 cranks and was wondering if your gonna do a build if you'd be better off getting a new crank because of fatigue? Just thinking out loud.
super diesel
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