do i have to get this balanced?
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,063
Likes: 1
From: Beverly Massachusetts
do i have to get this balanced?
i bought an Eagle Cast Steel Crankshaft and when i opened the box it has a tag that says NOTICE trial fit complete rotating assembly before balancing crankshaft! i thought taht they were balanced before they were shipped. TIA
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
I think they are only balanced if you buy the balancing option. Nontheless, you should always have the balance checked by your engine builder or machine shop. Mistakes can happen and it is your final responsability to verify correctness.
Pro
Joined: Aug 2005
Posts: 613
Likes: 2
From: West Central Florida
Call them and ask if it has been balanced to a bob weight of a specific gram, usually they are and the cast is usually to about 1850 grams or so. In which case you just need to balance the rest of the parts (rod/piston assy) to the bob weight.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
That's a stock stroke replacement-type crank for 350 ... if all you're doing is a rebuild ... then just put it together & don't worry about balancing ... it'll be darn close.
Originally Posted by LIQUIDDRAGON
i bought an Eagle Cast Steel Crankshaft and when i opened the box it has a tag that says NOTICE trial fit complete rotating assembly before balancing crankshaft! i thought taht they were balanced before they were shipped. TIA
Drifting
Joined: Oct 2004
Posts: 1,259
Likes: 7
From: Ontario
Originally Posted by dgruenke
I think I saw somewhere on their website that only the forged cranks and rotating assembly is internally balanced. I think the cast ones have to be balanced.
Do you have to get it balanced? Not likely for stock, but recomended. I think it only cost me $200 to have the full rototating assembly balanced.
Last edited by Retro78; Mar 25, 2006 at 06:58 PM.
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Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,063
Likes: 1
From: Beverly Massachusetts
well from the advice i got here i will find a place to bring it and get the crank rods and pistons balanced. im running this TCI balancer
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
Trial fitting means just that, making sure the rotating assembly physically fits inside the crankcase. I bought a stroker crankshaft with counter weights that interfered with the sidewalls of the crankcase, and not by a small amount that could be rectified by a little clearancing with a die grinder, the counter weights needed to be fly cut.
I bought a set of pistons that were supposed to be for a stroker application, and they were, just not for the rod length I was using. I took the rotating assembly along with the block to the machinist for boring and balancing. When I got everything back, upon assembly found the pistons protruded 1/8” above the deck, wrong pistons for the rod/stroke combination. Had to return the pistons for the correct ones and have the rotating assembly rebalanced a second time.
Point being is never assume anything when building an engine. Never assume the machinist machined your parts to the proper dimensions, never assume the bearings you bought are the correct ones for your application, never assume the piston clearance is correct for your engine, etc. There’s a lot of work in checking clearances when putting an engine together, but ultimately it will be up to you to do the verifications.
I bought a set of pistons that were supposed to be for a stroker application, and they were, just not for the rod length I was using. I took the rotating assembly along with the block to the machinist for boring and balancing. When I got everything back, upon assembly found the pistons protruded 1/8” above the deck, wrong pistons for the rod/stroke combination. Had to return the pistons for the correct ones and have the rotating assembly rebalanced a second time.
Point being is never assume anything when building an engine. Never assume the machinist machined your parts to the proper dimensions, never assume the bearings you bought are the correct ones for your application, never assume the piston clearance is correct for your engine, etc. There’s a lot of work in checking clearances when putting an engine together, but ultimately it will be up to you to do the verifications.
Last edited by shafrs3; Mar 25, 2006 at 11:21 PM.