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AMC Harmonic Vibration Damper Listing

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j2sax View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote j2sax Quote  Post ReplyReply Direct Link To This Post Posted: Apr/23/2012 at 11:24pm
I have had a slew of bad balancers lately on later 360's and 258's... 

Without having to go full boogey SFI rated, are there any good new replacement balancers to be had out there?  

Thanks, 

Jesse
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Plenty of FSJ's Eagles and other AMC's near Springfield, MO
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbadgreen Quote  Post ReplyReply Direct Link To This Post Posted: Apr/23/2012 at 11:50pm
how about the 66 290 version.does it just look different? or is it actually ballanced different? that would make a 66 290 pretty rare if it was....also im getting ready to put a 66 balancer on my 68 290Confused
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbadgreen Quote  Post ReplyReply Direct Link To This Post Posted: Apr/24/2012 at 10:12am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/24/2012 at 9:22pm
The 66 290 one looks different on the front AND the back.  I believe the mass is the same.  Why they changed it... no clue. Probably for manufacturing reasons.
Here is something to watch for on one of the aftermarket dampers..
Professional Products design their Powerforce harmonic damper (# 80101) specifically for the latter engines.  I don't know when AMC did it but they changed the seal area in the timing covers some time in the '80's and took out the front lip at the seal.  The good thing was you could now change the seal with out taking the timing cover off.  The bad thing is now there is interference with the damper counterweights with the old design front cover.  Just one more part that has to be worked on to make right...
 

The other thing that I always have to do is open up the inside diameter.  They made the counter bore too shallow so the damper doesn't even engage on to the key before the press fit starts to engage.  So, I sand out the step with a die grinder.  If I don't do this I will actually achieve max torque before it fully seats against the oil slinger.  I will have to call them again to see if they will fix any of this stuff..



Edited by SC397 - Oct/07/2013 at 9:48pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Aug/31/2013 at 9:55pm
So not to flog a dead subject here but I do remember seeing info about the dampener getting "fine" balance at assembly.  I just found the document about the balance.  It is in the last sentence under the Harmonic Balancer Section.  Also check out the comments on the flywheel, it says it was drilled on final balance??  Any comments

Ross K. Peterson
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KLW Quote  Post ReplyReply Direct Link To This Post Posted: Aug/31/2013 at 10:53pm
Here's a dumb question, but why do you need a 4 bolt damper? From what I understand, the accessories (like the alt, ps pump, etc) from a 4 bolt will line up just fine if you use a 3 bolt damper and pulley.

PLEASE correct me if I'm wrong!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/31/2013 at 10:58pm
not a dumb question at all. The 4 bolt damper pulley is a different depth than the three bolt so things like alternator and water pump pulleys and or shafts are different depths as well.  Likewise the 4 bolt setup pulleys are actually a different diameter as well so that the water pump pulley will usually contact the damper pulleys when you mix and match them.

Edited by amx39068 - Sep/01/2013 at 9:36am
Dan Curtis, AZ AMC Collector Quality Restorations & Parts - amcmusclecars.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote KLW Quote  Post ReplyReply Direct Link To This Post Posted: Aug/31/2013 at 11:48pm
Good to know. Here's what I'm doing and I hope it works out. I bought a Performance Products # 90101, a water pump off a 304 and the brackets off a 401 or 360. It seems like that would work OK, but we'll see!

Let me know if you have a better set up for my 390 based stroker (neutral balanced).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/01/2013 at 12:03am
should work fine.  All the same model year stuff is a good thing.
Dan Curtis, AZ AMC Collector Quality Restorations & Parts - amcmusclecars.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6PakBee Quote  Post ReplyReply Direct Link To This Post Posted: Sep/01/2013 at 9:14am
The amount of down and dirty technical knowledge on this forum never ceases to amaze me.  I just finished archiving all of this on my PC for future reference.  This should be a sticky.  
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The difference between people and AMC's is that they will always be making more people; they won't be making more AMC's

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