Harmonic balancer... what to get?
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Joined: Sep 2002
Posts: 55
Likes: 0
Re: Harmonic balancer... what to get? (Fevre)
I had an almost identical problem at 2500 rpm. Believe me, a 427 will shake the hell out of your car if you have a bad balancer. Replaced it with new GM balancer, vibration eliminated.
Burning Brakes
Joined: May 2001
Posts: 988
Likes: 1
From: Dyersburg TN
Re: Harmonic balancer... what to get? (A C)
I am on my third elastomer type balancer in three years. One 30 year old stock piece (came on my car), one brand new Proform, and one used 72 GM piece. Every one of them slipped the outer ring after I ran them. It didn't slip in or out, it slipped around the inner piece, throwing the timing mark off (WAY off with the original balancer). The first time, it took me a very long time to figure out why it ran like crap when I timed it off the balancer. There was no vibration, it just threw the timing mark off. I am going to go with a Fluiddamper Streetdamper next time, as there is no way to mess that one up.
AC
AC
Le Mans Master
Joined: Jul 1999
Posts: 9,206
Likes: 17
From: Sewell NJ
Re: Harmonic balancer... what to get? (Todbo)
I am on my third elastomer type balancer in three years. One 30 year old stock piece (came on my car), one brand new Proform, and one used 72 GM piece. Every one of them slipped the outer ring after I ran them. It didn't slip in or out, it slipped around the inner piece, throwing the timing mark off (WAY off with the original balancer). The first time, it took me a very long time to figure out why it ran like crap when I timed it off the balancer. There was no vibration, it just threw the timing mark off. I am going to go with a Fluiddamper Streetdamper next time, as there is no way to mess that one up.
AC
I've got the same problem as AC , I ve got my car tuned by ear at the moment :crazy:
AC
I've got the same problem as AC , I ve got my car tuned by ear at the moment :crazy:
Instructor
Joined: Jan 2003
Posts: 222
Likes: 0
From: Ventura CA
Re: Harmonic balancer... what to get? (coldwarrior2000)
I had an almost identical problem at 2500 rpm. Believe me, a 427 will shake the hell out of your car if you have a bad balancer. Replaced it with new GM balancer, vibration eliminated.
Thread Starter
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Re: Harmonic balancer... what to get? (BB73Chris)
Just pulled my old balancer off a few minutes ago. An inspection showed the elastomer had dried into a rock and it had several cracks (the rubber, not the steel). I matched it to the new balancer and found that the old one had slipped, although only 3 crank degrees.
Well, break's over and I'm heading down to install the new one. Even if the vibration wasn't caused by the balancer, I think it was time to replace it. :yesnod:
Well, break's over and I'm heading down to install the new one. Even if the vibration wasn't caused by the balancer, I think it was time to replace it. :yesnod:
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Thread Starter
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Re: Harmonic balancer... what to get? (cardo0)
It fixed the engine vibration. Still have a slight vibe in 4th gear only. Must be the tranny. I was hoping that it would also be the balancer, but I guess you can't win them all.
I checked timing and it confirmed the old balancer had slipped 3 crank degrees.
I checked timing and it confirmed the old balancer had slipped 3 crank degrees.
