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Author
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Topic: Harmonic Balancer question
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Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
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posted 10-10-2002 09:27 PM
   
Picked up a Ford OEM balancer for my 68 302. It was listed for 65-68 289. Dimensionally it is the same size and everything matches except:
1. The primary hub is thivker on my original.
2. The weight is thicker on the new one.
But the odd thing is that my old balancer weighs more. Both are 28oz balancers though. Should I be concerned about the weight difference (not sure how much but it is noticeable)???
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Dave Gibson
Moderator Posts: 7157
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 10-10-2002 10:55 PM
Have you put both balancers on a scale yet to compare weights? That would be the first thing I would do.Dave & Terri ------------------
Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
'02 Explorer XLT, Black, 3.73:1 limited slip, class III tow package!
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Pierre
Gearhead Posts: 357
From: France
Registered: Apr 2002
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posted 10-11-2002 07:25 AM
quote:
Originally posted by Calcat:
Picked up a Ford OEM balancer for my 68 302. It was listed for 65-68 289. Dimensionally it is the same size and everything matches except:
1. The primary hub is thivker on my original.
2. The weight is thicker on the new one.
But the odd thing is that my old balancer weighs more. Both are 28oz balancers though. Should I be concerned about the weight difference (not sure how much but it is noticeable)???
The 2 most important things are that
1 - they are both 28oz: the amount of extra material composing the off-balance 28oz weight should be roughly the same size on both dampers
2 - that the timing marks are at the same location I wouldn't worry about weight differences as long as that weight difference is evenly spread around the damper.
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Fastback68
Gearhead Posts: 1564
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 10-11-2002 08:30 AM
I'm confused Pierre. It's important that they are both 28 oz dampers, but it doesn't matter if they have different weights?
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mustangzrule
Journeyman Posts: 87
From: Orion, MI
Registered: Sep 2002
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posted 10-11-2002 09:36 AM
I would worry about the balance (distribution of weight around center) and not the total damper weight. In the case of overall weight, less is always better as long as there's engouh dampening mass to handle the engine's spikes.
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Pierre
Gearhead Posts: 357
From: France
Registered: Apr 2002
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posted 10-11-2002 11:05 AM
quote:
Originally posted by Fastback68:
I'm confused Pierre. It's important that they are both 28 oz dampers, but it doesn't matter if they have different weights?
Think of it as a wheel, a wheel should be balanced meaning that the weight of the overall wheel is evenly spread around its center. So when it spins it will be smooth. A SB damper is natively unbalanced, meaning that it has an extra weight of 28oz on one side (if spun it would vibrate) to make up for the unbalanced situation of the crank & flywheel. The SB specs states that your damper must be 28oz or your engine will shake badly. This is why 28oz is important but overall weight doesn't matter that much (lighter will be better though) Dampers are my life 
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Fastback68
Gearhead Posts: 1564
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 10-11-2002 11:13 AM
I live and learn  For some reason I'd got it into my thick head that the whole thing only weighed 28 oz, which of course is ridiculous!
P.S.: How can you say "Dampers are my life"? Are you not interested in girls, money, drugs, etc.???
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Pierre
Gearhead Posts: 357
From: France
Registered: Apr 2002
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posted 10-11-2002 11:32 AM
quote:
Originally posted by Fastback68:
I live and learn For some reason I'd got it into my thick head that the whole thing only weighed 28 oz, which of course is ridiculous!
P.S.: How can you say "Dampers are my life"? Are you not interested in girls, money, drugs, etc.???
Cause I unwillingly spent countless hours and money  on this darn thing thinking it was the cause to my vibs problems
As for girls, my wife only authorized one girlfriend , and that girlfriend is heavy set and eats a good chunk of the money I earn !
She has come to admit that a regular girlfriend may have been a better deal
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Calcat
Journeyman Posts: 75
From: Los Angeles, CA
Registered: Feb 2002
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posted 10-12-2002 02:17 AM
Thanks for the replies. Pierre - I also learned something, that the 28oz-in designation refers to 28oz for every radial inch off center. Live and learn.
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Lennie
Journeyman Posts: 40
From: Denton, TX, USA
Registered: Dec 2001
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posted 10-13-2002 10:30 PM
OK, let me throw my 2cents worth in and hopefully not confuse everyone. I've got a 289 and what I did was to purchase a Vibratek 28.2 in. oz. damper and am installing a T-5 tranny. What I did was to take the entire rotating assembly along with the 50 in. oz. flywheel from a 5.0 liter engine to the machine shop and had them balance the flywheel to the rest of the rotating assembly. Doing it this way, I'm able to use a newer high torque starter, different tooth count than the older starters, and still have everything in balance. It only cost me $60 to have the flywheel balanced out to 28.2 in. oz.
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