Harmonic Balancer Difference
#426900
08/02/09 09:27 PM
08/02/09 09:27 PM
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Joined: Feb 2003
Posts: 607
NY
old340dog
OP
mopar
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OP
mopar
Joined: Feb 2003
Posts: 607
NY
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What is the difference between a internal and a external harmonic balancer? I need to order one for my car. The motor is a 1973 340 with a mild rebuild. Also recomendation for brand name and place to order.
old340dog
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Re: Harmonic Balancer Difference
[Re: 440beep]
#426904
08/02/09 11:52 PM
08/02/09 11:52 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
Quote:
External Balance will have an offset weight to compensate for (balance) the rotating assembly... If the engine has a forged crank typically there is enough weight in the counter weights to internally balance the engine.. On a cast crank the material is less dense so it doesn't weigh enough to compensate for the pistons & rods... The cgoices become lighter pistons & rods ($$$$) Mallory (very heavy) metal slugs in the crank ($$$) or a damper and flywheel/flexplate with offset weights... A 73 should have a cast crank... BTW this picture shows a externally balanced 440 damper... (Thanks Brandon!)
that is not 440 one is a 1972 Shown above is damper #3614374, used on 400's with external balance cast cranks one this a 70-71 440 hp Even though these dampers have an elliptical weight, they were never used with any cast cranks. These dampers were used with steel cranks and "six pack" (2951908 casting #) rods.one 
He NEVER said that was a 6 pk balancer , it was used as a REFERENCE photo ...
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Re: Harmonic Balancer Difference
[Re: 440beep]
#426906
08/03/09 12:46 AM
08/03/09 12:46 AM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
 i did he say is a 440 one 
Your right I did... Shoot me..
I've edited the post to show a 440 damper..
What it's off has no bearing on the fact I used the photo to show what a balancer with an offset balance weight looks like... I take the time to explain throughtly in an in-depth technical way the answer to a question & rather than add something useful you feel the need to be a pinhead... 
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Re: Harmonic Balancer Difference
[Re: 1_WILD_RT]
#426907
08/03/09 04:54 AM
08/03/09 04:54 AM
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Joined: Feb 2003
Posts: 607
NY
old340dog
OP
mopar
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OP
mopar
Joined: Feb 2003
Posts: 607
NY
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So after all this, back to my original question I have a 1973 340 and I need a harmonic balancer. Is my motor internally or externally balanced?
old340dog
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Re: Harmonic Balancer Difference
[Re: MoparforLife]
#426909
08/03/09 08:21 AM
08/03/09 08:21 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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 what about the bullet nose external bal 440 cast crank?? that makes 3..correct? yes,  73 340 cast crank is extenal bal 
Last edited by scratchnfotraction; 08/03/09 08:22 AM.
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Re: Harmonic Balancer Difference
[Re: old340dog]
#426910
08/03/09 08:22 AM
08/03/09 08:22 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
So after all this, back to my original question I have a 1973 340 and I need a harmonic balancer. Is my motor internally or externally balanced?
Was the engine rebuilt or is it still factory original ? Does it have a cast or a forged crank ? Can't give you a definitive answer without some basic, not so vague, info .
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Re: Harmonic Balancer Difference
[Re: buildanother]
#426913
08/03/09 07:01 PM
08/03/09 07:01 PM
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Joined: May 2004
Posts: 1,031
South Jersey
kruger
Yours Too!
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Yours Too!
Joined: May 2004
Posts: 1,031
South Jersey
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Thats also the kind of damper thats used to hit us over the head with when we write a big check for car parts. Just ask my wife  . Thats #4 Correct?
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