C6 Harmonic balancer question

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Apr 2, 2015 | 07:55 PM

SpeedUp

Thread Starter

Drifting

Joined: Apr 2005

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From: McKinney TX

C6 Harmonic balancer question

Was the problem that some C6s had with bad harmonic balancers limited to certain years? or is it still a problem with C7s ?

Did they have it figured out by 2012? My 2012 3LT base vert kinda wobbles, but I have read here that a little wobble is ok. I can watch the path of the belt through the pulleys and its straight, meaning the belt isnt moving around between the pulleys.

Is my HB a ticking time bomb ?

Apr 2, 2015 | 08:53 PM

simplegto

Drifting

Joined: Apr 2011

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From: Houston, Tx

St. Jude Donor '11-'12-'13-'14

Some say yes and some say no but nobody knows for sure. Some have replaced then on 2013s and some early years have had no problems. I have worried and watched it wobble for 4 years and 60,000 miles and was told by the local Corvette guru that when it goes I will know for sure. I think they all wobble some.

Apr 2, 2015 | 09:58 PM

SpeedUp

Thread Starter

Drifting

Joined: Apr 2005

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From: McKinney TX

I found this youtube video on a wobbly balancer. If this is what a bad one looks like, mine is good for now.

https://www.youtube.com/watch?v=XrYo...ature=youtu.be

Apr 2, 2015 | 11:04 PM

v26278

Melting Slicks

Joined: Sep 2011

Posts: 3,021

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From: Vancouver Island

Its a common concern. Mine has always wobbled, dealer says its within tolerance but can't say what the acceptable limit is for run out. My belts don't chirp and the wobble hasn't gotten any worse so I'm leaving it be. BTW its not a balancer, it doesn't balance anything. It dampens the twisting and recoiling that results from the crank flexing after each firing impulse so as to prevent the crank from self destructing when its natural harmonic frequency is reached (pardon my amateur knowledge of physics if that isn't 100% accurate) Apparently it can still function properly with a certain degree of wobble.

Last edited by v26278; Apr 2, 2015 at 11:23 PM.

Apr 3, 2015 | 08:00 AM

B-Vette

Melting Slicks

Joined: May 2006

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From: Edmonton Alberta

Quote:

Originally Posted by mode101

It was a problem on C5's and on C6's, I haven't heard anything about C7's.

Apr 3, 2015 | 08:34 AM

Mad*Max

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Joined: Apr 2007

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From: Toronto, Canada

C7 of the Year - Unmodified Finalist 2021

mine has a slight wobble for the last few years at least (even since I knew about checking it)

Apr 3, 2015 | 08:47 AM

Boomer111

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From: Bay Area Ca.

From what I hear a slight wobble is common with nothing necessarily being wrong other than a defective design from the get go.

Apr 3, 2015 | 08:48 AM

JD's06

Instructor

Joined: Nov 2012

Posts: 167

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From: Viera Fl.

That's what my 2012 looks like. I am going to replace it with ATI. Mine is also supercharged.

Quote:

Originally Posted by mode101

I found this youtube video on a wobbly balancer. If this is what a bad one looks like, mine is good for now.

https://www.youtube.com/watch?v=XrYo...ature=youtu.be

Last edited by JD's06; Apr 3, 2015 at 08:50 AM.