Crank Question
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Teching In
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Crank Question I have an LQ4 I had bored 030 over. I was going to use stock crank. My question is should I buy a used stock crank and when I get my pistons and rods bring it all to the machine shop and have it balanced or would it be worth it buying a remanufactured crank like this one...
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Thoughts?
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Thoughts?
Last edited by KCS; Jun 24, 2017 at 03:28 PM.
Use your stock crank. buying off ebay is a crap shoot for things like that. Your stock crank is good enough. quite a few times youd not need to rebalance for oversize due to the actual weight diff being negligible. not sure about .030 best way is to weigh the diff and find out. Your stock crank should already be balanced close to what you're looking at doing.
There is really no need to balance it, but if you are going for a performance build, it wouldn't hurt to balance the rotating assembly. Just make sure they don't balance it with the harmonic dampener installed.
The pistons are for a .030" over bore so they probably weigh enough to need to balance the crank. I would balance it at least.
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Thread Starter
Teching In
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Thanks for the replies guys and sorry for the late response. I don't have a crank on hand yet that's why I was asking if I should buy used and have it machined or buy an already remanufactured crank. Taking your advice into account (I'll end up getting it balanced - my rotating assembly) should I try and find a used crank in good shape that hasn't been machined yet and get it all done when I have it balanced and just stay away from a remanufactured crank?
Last edited by cnqrthedirt; Jun 24, 2017 at 04:25 PM. Reason: Spelling error.
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Verdad Gallardo Like i said we have some cranks that are already machined and rough balanced close. for a .030 id recommend a balance but youll save money on polish and mic and chamfer holes as ours already has that done.
Thread Starter
Teching In
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Sounds good I'll go that route, whenever you get a price shoot me an e-mail.
BW for a LS engine Hi 07, MOST here provide BAD TECH.
The BW allows for a LIGHTER balance for a GOOD REPORT, MY method IS 2% OVER.
Your could BUY some STRONGER, "lighter" pins !
SURE .003" should be correct, thought is is DEPENDENT one PISTON WEIGHT.
THUS SAVE $250.00 AND FIT a STRONGER PIN.
Lance
The BW allows for a LIGHTER balance for a GOOD REPORT, MY method IS 2% OVER.
Your could BUY some STRONGER, "lighter" pins !
SURE .003" should be correct, thought is is DEPENDENT one PISTON WEIGHT.
THUS SAVE $250.00 AND FIT a STRONGER PIN.
Lance
Piston Weight .003" OR .030" OVERBORE Hi CN, sure your block is now a .030" OVERBORE.
WHAT I stated is you could have JUST HONED +.003 to +.007, SAVING that Bore Job COST.
THAT cost saving could have allowed you to purchase a "custom" LIGHTER FORGED PISTON.
THE BAD "tech" here is for you to BUY a "shelf" item, NOT ALWAYS the best choice for QUALITY at LOW COST.
YES use the crankshaft you have, the original item if in good condition.
Weigh a Rod/Piston from your old engine.
This is a Balance Shop task unless you have a "beam" scale with the rod bracket.
The BW (Bob Weight) would then be known.
The new piston, .030" overbore, could be less weight when the rings, pins, piston itself are added, thus a known value.
The piston manufacturer WILL provide this information if asked before a purchase in made.
This value ONLY needs to be less (2-3 %) or equal to the OEM weight.
They too will agree with the "tech"
THIS is a quality engineering practice.
Lance
WHAT I stated is you could have JUST HONED +.003 to +.007, SAVING that Bore Job COST.
THAT cost saving could have allowed you to purchase a "custom" LIGHTER FORGED PISTON.
THE BAD "tech" here is for you to BUY a "shelf" item, NOT ALWAYS the best choice for QUALITY at LOW COST.
YES use the crankshaft you have, the original item if in good condition.
Weigh a Rod/Piston from your old engine.
This is a Balance Shop task unless you have a "beam" scale with the rod bracket.
The BW (Bob Weight) would then be known.
The new piston, .030" overbore, could be less weight when the rings, pins, piston itself are added, thus a known value.
The piston manufacturer WILL provide this information if asked before a purchase in made.
This value ONLY needs to be less (2-3 %) or equal to the OEM weight.
They too will agree with the "tech"
THIS is a quality engineering practice.
Lance
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someone had to say it! 2 - 3% is quite a bit of a swing even when you are talking over 1200 grams.
Thats why some pistons arent an issue like using 4.8 flat tops instead of 5.3 dish etc if you're talking that much.
Using a light weight pin wont help with anything either, esp of you wanna spend extra money on it and a custom piston set vs balancing.
Thats why some pistons arent an issue like using 4.8 flat tops instead of 5.3 dish etc if you're talking that much.
Using a light weight pin wont help with anything either, esp of you wanna spend extra money on it and a custom piston set vs balancing.