Balancing Rotating Assembly With the Flywheel?????
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
Balancing Rotating Assembly With the Flywheel????? I am still a bit confused fellas, I am building my stroker (383) with a callies racemaster crank, Lunati forged I beam pro billet rods, and wiseco pistons. I have the block in the shop right now, and am still confused about the assembly.
My machinist is very well known and Highly reputable, not just in Denton but all around.
-He told me when I have the rotating assembly balanced since I am running a manual that I should have the assembly balanced with the Flywheel and pressure plate on it.
-Yet I have heard that All LS motors are internally balanced (not sure what that means) and that I Do not want the assembly balanced with the flywheel and pressure plate. I am very confused could someone please help clarify this matter.
Do I need it balanced with the Fly/PP or Not, and why would help to, I am always in need of more knowledge.
Thanks Fellas
My machinist is very well known and Highly reputable, not just in Denton but all around.
-He told me when I have the rotating assembly balanced since I am running a manual that I should have the assembly balanced with the Flywheel and pressure plate on it.
-Yet I have heard that All LS motors are internally balanced (not sure what that means) and that I Do not want the assembly balanced with the flywheel and pressure plate. I am very confused could someone please help clarify this matter.
Do I need it balanced with the Fly/PP or Not, and why would help to, I am always in need of more knowledge.
Thanks Fellas
I would suggest No. No need to balance the flywheel/PP to the rotating assembly, it would then become married to the rotating assembly. So in the event you tear up a flywheel, your replacement would have to be identical to the one you are replacing. If weight was removed from either end (flywheel/PP or balancer) it is not easy at all, sometime impossible, to replicate with the replacements depending upon how they are tore up. Then you are screwed.
I would internally balance the rotating assembly (without flywheels or balancers) and then '0' balance those components separately. They have arbors for mounting these components to, to do this correctly. That way if you ever had an issue with one or the other you could just '0' balance the replacement and move on without disturbing your engine's balance. Most of the time the 'good' wheels and balancers are spot on.
Most experienced builders would do it this way.
Did your builder explain his reasoning?
I would internally balance the rotating assembly (without flywheels or balancers) and then '0' balance those components separately. They have arbors for mounting these components to, to do this correctly. That way if you ever had an issue with one or the other you could just '0' balance the replacement and move on without disturbing your engine's balance. Most of the time the 'good' wheels and balancers are spot on.
Most experienced builders would do it this way.
Did your builder explain his reasoning?
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
During some research, I learned that most high quality new clutch/flywheels come balanced as a unit. If thats the case then you dont need them when doing an engine internal balance. You wont be bolting anything to the engine that would throw it out of balance you know 
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
No he didnt specify why he thought they should be balanced together, He just said that it was the best way to do it. But I am with you on the part of not doing it, If done that way then the units would be married and if anything changed then all of it would be out of balance again. I will talk with him again.
Launching!
Joined: Sep 2009
Posts: 260
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From: greensboro, nc
Your machinist will first balance your crank and then install the flywheel and pressure plate. He will then re-spin the assembly to make sure the flywheel assembly has been balanced correctly. Not a bad idea IMO.
Good point in that regards, same as using the arbor then, instead just using the crank as one. This would certainly work also. Same concept as balancing the wheel/PP separate.
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Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
I will ask him in much more detail on monday. I am going with one of the new monster twins when it comes out around the end of the month. I hope they are a balanced unit. If the crank and rods assemby is balanced and then the PP and flywheel are checked and are not balanced then they would modify the flywheel correct?
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Verdad Gallardo Yes, which is fine then. I commented 'no' originally thinking changes would be made to the rotating assembly based on the flywheel/pp influence. That is what I would not recommend. The latter is fine. Nothing wrong with checking and/or balancing the flywheel and PP after the rotator has been done. Makes good sense, as does using an arbor, if they have one. Good luck.
