Flywheel Balance Confused????
Thread Starter
Racer
Joined: Mar 2002
Posts: 444
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From: Niceville FL
Flywheel Balance Confused????
I have read several times that if the flywheel is removed it must be reinstalled in the same relative position becaused it was balanced this way. If that is true what happens when you instal a new flywheel ???
:confused: :confused: :confused:
I will soon be doing a new ZO6 clutch etc. and would like to know.
:flag :flag :flag :flag
:confused: :confused: :confused:
I will soon be doing a new ZO6 clutch etc. and would like to know.
:flag :flag :flag :flag
Racer
Joined: Mar 2003
Posts: 292
Likes: 0
From: Southbury CT
Re: Flywheel Balance Confused???? (speedyc5)
You raise a good question. The book says if you're reinstalling an existing flywheel (on the same engine), do so in the same position as it came off (mark it before removing). But if you're installing a new flywheel, the orientation doesn't matter. This assumes you're using the existing clutch/pressure plate with the existing flywheel, and a new one with the new flywheel. The flywheels on new cars sometimes come with balance weights. So the new installation proceedure seems at odds with this, unless the entire factory flywheel, clutch and pressure plate assembly are partially balanced using flywheel weights, and replacement/aftermarket assemblies are also balanced bolted together. Makes sense.
It becomes a little more confusing (not for what you're doing) when you bolt a used assembly on to a different engine. Then you're supposed to remove any flywheel weights, implying that the weights are balancing something other than the flywheel/clutch assembly.
In any case, use new bolts with some form of liquid threadlock. Torque them in a criss-cross pattern in three steps-15, 37, and finally 74 lb. ft.
It becomes a little more confusing (not for what you're doing) when you bolt a used assembly on to a different engine. Then you're supposed to remove any flywheel weights, implying that the weights are balancing something other than the flywheel/clutch assembly.
In any case, use new bolts with some form of liquid threadlock. Torque them in a criss-cross pattern in three steps-15, 37, and finally 74 lb. ft.
Le Mans Master
Joined: Oct 2001
Posts: 5,577
Likes: 3
From: Southern Maryland Maryland
Re: Flywheel Balance Confused???? (Tree)
The LS1 is internally balanced as I have verified it myself. The clutch *SHOULD* be 0 balanced. I have spent 6 months working on this before I tore a motor apart and checked the balance.
Phillip
Phillip
Race Director
Joined: Sep 1999
Posts: 12,439
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From: CONCORD NC
Re: Flywheel Balance Confused???? (Phil97SVT)
In a perfect world, you buy a new cluch and flywheel together, and they are marked with the balanced position. However, in our world, everything should be neutrally balanced on its' own.
Dave
Dave
Safety Car
Joined: May 2000
Posts: 4,827
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From: Albuquerque NM
Re: Flywheel Balance Confused???? (davidfarmer)
I have read that the LS1, while internally balanced, gets it's FINAL balance with the flywheel and clutch attached. That's when they put the weight on the flywheel. But does that weight compensate for imbalances in the flywheel/clutch or the engine? We put on a zero balanced Spec clutch/flywheel on my Vette, the stock flywheel had a one gram weight inserted from the factory. After talking to the tech guy at Spec, we didn't drill and install it on the new one. Yes it was only one gram, so I was lucky, it runs fine, no vibrations without it.
[Modified by 6Speeder, 12:19 PM 11/25/2003]
[Modified by 6Speeder, 12:19 PM 11/25/2003]
Racer
Joined: Mar 2003
Posts: 292
Likes: 0
From: Southbury CT
Re: Flywheel Balance Confused???? (6Speeder)
Responses, including mine, to your original question are getting way too complicated and unspecific. Bottom line is buy a flywheel/clutch/pressure plate assembly and install it. If you have any doubt that it's properly balanced, have it balanced before you install it. I bought a stock Z06 assembly (as you're contemplating) from a Forum supporter and installed it just as it came. It works great without any vibration.
Thread Starter
Racer
Joined: Mar 2002
Posts: 444
Likes: 0
From: Niceville FL
Re: Flywheel Balance Confused???? (speedyc5)
Thanks for your replys. Being this job is very labor intensive I'll get the clutch, flywheel ,pressure plate all balanced before the install. I would not even want to think about going in there twice!!
:cheers: :cheers: :cheers: :cheers:
I would have to think GM or YUGO, for that matter, would never balance the flywheel etc. to compensate for any inbalance in the engine.
:steering: :steering: :steering:
:cheers: :cheers: :cheers: :cheers:
I would have to think GM or YUGO, for that matter, would never balance the flywheel etc. to compensate for any inbalance in the engine.
:steering: :steering: :steering:
