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Old 09-27-2003, 02:28 AM
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Harmonic Balancer

Fixing to drop a rebuilt 400 into a 68 GTO. Will be getting the engine back from the machine shop in a week or so and I need to purchase a harmonic balancer. Does the whole engine then need to be balanced by the shop or can I put it on when I get the engine back to the house? Also what are the pros and cons of a liquid balancer and who makes a good balancer both liquid and non.

Thanks guys

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Old 09-27-2003, 02:35 AM
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To be absolutely correct it should be balanced as an assembly, if its just a rebuild for a street car an OEM balancer would be a correct bolt on, the problem with fluid dampers is they can't be balanced to your assembly, and the fluid only has a "life" of about three years, my balance man hates em, especially if they've been on somebodys bench for years.
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Old 09-27-2003, 07:43 AM
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DITTO with Bob.
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Old 09-27-2003, 11:22 AM
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I run a fluidamper and have nothing but good things to say about it.
Not a single problem and it really took the shake out of my car when running soild motor/trans mounts.
GM even sells a fluidamper now...

http://www.gmgoodwrench.com/gmgoodwr...5&sku=10051170

http://www.flatlanderracing.com/gmsbpulleys.html

http://www.fluidampr.com/


Never heard of them only lasting 3 years but a lifetime
http://www.fluidampr.com/asktech.html

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Old 09-27-2003, 11:30 AM
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Arrow

Fluidamper had quality problem's and went bankrup. Some of the car performance departments stopped selling them because of it.
Now the have new owners. FYI from site.
Springville, NY – Horschel Brothers Precision LLC Has announced that it has purchased the assets of the following Vibratech product lines: Fluidampr, Streetdampr, and Heavy Duty Viscous Dampers The new entity will be called VibratechTVD (torsional vibration dampers).
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Old 09-27-2003, 11:35 AM
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Glad to see they will be sticking around
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Old 09-30-2003, 02:30 PM
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A Harmonic Balancer is a torsional dampener (vibration absorber) for the most part. Some engines are externally balanced and use the balancer/and or flexplate assembly to help accomplish this.

When an engine is "professionally built" it's balanced before the engine is put together. The pistons are weighed and adjusted until each rod and piston assembly weigh the same. The crankshaft is then dynamically balanced with bob weights that simulate the weights of the pistons/rods.

Bolting on the correct harmonic balancer for your year and cubic inch engine should have no effect on "balance". Different qualities/types/applications of harmonic balancers or torsional dampeners which is what they really are will help absorb more vibration, their intended function.

That rubber ring that the cast iron wheel is bushed to the hub with is what absorbs the vibration. Different diameters and overall weight of the dampener will change it's application or rpm range it's intended to dampen vibrations.

Some dampeners are more effective for high rpm use while others are for low rpm use(oem type). Sharp engine builders will pick the balancer tuned for the rpm the engine will be run at.
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Old 09-30-2003, 04:03 PM
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Use an ATI, Every Super late I 've ever seen uses them. Gotta Be a reason.
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