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Username Post: bad balancer        (Topic#360219)
troyd1 
Poster
Posts: 80

Reg: 03-22-09
03-19-20 06:53 PM - Post#2789018    

just wanted some opinions. I ran this motor for probably a year until i found the problem. changed u joints, balanced tires,etc. it would vibrate only at a certain rpm. motor runs well, 80's 454. i will probably check everything because it's out right now. just wondering if others have had something similar and what they found. thanks



 


Rick_L 
Member #409
Posts: 27698
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
03-19-20 08:25 PM - Post#2789022    
    In response to troyd1

A 454 balancer has a counterweight cast in. A 396-427 balancer does not. Thing is, the wrong balancer won't just vibrate at one rpm - it will just vibrate more the higher the rpm.



 
65_Impala 
Very Senior Member
Posts: 4440

Reg: 12-29-02
03-20-20 09:37 AM - Post#2789051    
    In response to troyd1

So, what does bad mean - slipped, balance not matching engine or something else? There are a number of ways a balancer can go bad or be wrong for the engine.



 
troyd1 
Poster
Posts: 80

Reg: 03-22-09
03-20-20 10:36 PM - Post#2789093    
    In response to 65_Impala

definately slipped at least. timed it with a vacuum gauge as timing light was way off. not a real motor man. just thought that the vibration could have hurt the internals



 
IgnitionMan 
Valued Contributor
Posts: 3717

Reg: 04-15-05
03-21-20 01:59 PM - Post#2789149    
    In response to troyd1

Just curious, about the timing light, is it one of the "dial back" types?

If it is a dial back light, did you check timing with the dial back feature ON, or OFF, or....BOTH WAYS?



 
65_Impala 
Very Senior Member
Posts: 4440

Reg: 12-29-02
03-21-20 05:43 PM - Post#2789175    
    In response to troyd1

  • troyd1 Said:
definately slipped at least. timed it with a vacuum gauge as timing light was way off. not a real motor man. just thought that the vibration could have hurt the internals



The 454 balancer has the weight pad to externally balance the engine on the inner part so slipping wouldn't cause that weight to move. 400 small block was balanced on the outer part so one of those slipping did throw off the balance. But, the 454 balancer often had drilled balance holes in the outer part so slipping might have changed the balance enough to cause it to vibrate as you were experiencing. It could have also simply been because of the rubber material deteriorating and not being bonded to the ring.

The new balancer fixed up the vibration and the timing is OK now?




 


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