Got Engine Vibrations??
#16
Rennlist Member
Join Date: Oct 2005
Location: Gatineau, Québec, Canada
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As Greg pointed out on FB, and I hadn't even thought it through that far. Once installed you don't have to take the hub off to do a belt job. The damper is a two piece system and the damper is easy to remove. Undo the 9 bolts holding it together and wammo, off.
The hub can be removed with relative ease with a decent hub puller, and you can get them at any local parts store or ebay.
The hub can be removed with relative ease with a decent hub puller, and you can get them at any local parts store or ebay.
I also was wondering what we would do on a TB/WP job.
Looks like a great improvement part for our car.
Thanks to all involved.
#19
Thanks. I need to get into that 120-155 range more often to see how mine copes.
#20
This is the damper that requires heating for install?
Could you describe the install process in detail?
Where to heat, etc, etc ?
Your time and knowledge are valuable commodities. Thank you very much for sharing both.
Could you describe the install process in detail?
Where to heat, etc, etc ?
Your time and knowledge are valuable commodities. Thank you very much for sharing both.
#21
Rennlist Member
Thread Starter
Greg sends some great instructions, even I could follow them.
Gist of it is to pull off old hub. Separate the hub and damper. Put damper in oven and heat to 240f. Clean up and oil crank snout. Put on gloves and pick up hot damper from oven then quickly get to the crank and slide the hub on all the way. Ok to use a rubber mallet to push it all the way (I didn't need to, it slid on quick and easy once I got the keyway lined up correctly)
Once hub is on let it cool then put the damper on the hub, blue loctite on bolts and toque down to the proper specs (provided).
Gist of it is to pull off old hub. Separate the hub and damper. Put damper in oven and heat to 240f. Clean up and oil crank snout. Put on gloves and pick up hot damper from oven then quickly get to the crank and slide the hub on all the way. Ok to use a rubber mallet to push it all the way (I didn't need to, it slid on quick and easy once I got the keyway lined up correctly)
Once hub is on let it cool then put the damper on the hub, blue loctite on bolts and toque down to the proper specs (provided).
#22
Rennlist Member
I have an engine pull upcoming for complete catch-up maintenance. Sounds like the additional labor would be fairly low once the engine is out/front of the engine is off. Sean (or Greg): I did not see this part on the Precision site. What's the availability and cost of this puppy? Thanks!
Charlie
Charlie
#23
Rennlist Member
Thread Starter
I have an engine pull upcoming for complete catch-up maintenance. Sounds like the additional labor would be fairly low once the engine is out/front of the engine is off. Sean (or Greg): I did not see this part on the Precision site. What's the availability and cost of this puppy? Thanks!
Charlie
Charlie
#24
Thank you, very informative thread ! ! !
#25
Burning Brakes
I changed the damper on my 86 900 turbo in 2005 and the motor became really quite and pleasant again. I can believe that this is a part with a finite life based on common sense and that experience.
So, here some interesting questions about this product:
1.) Are there different parts for the various engines (GT, OB, S4)? I believe the factory has different part numbers. This would make sense, because any damper needs to be tuned to the characteristic frequency of the system. Within limits, one could make the argument that any new damper is better than a 30 year old one. But, that is not really the answer I am looking for.
2.) Do any feedbacks exist about lifetime, etc.?
Since the 91GT is currently under the knife for the 30 year maintenance, I really would like to replace the harmonic damper now.
So, here some interesting questions about this product:
1.) Are there different parts for the various engines (GT, OB, S4)? I believe the factory has different part numbers. This would make sense, because any damper needs to be tuned to the characteristic frequency of the system. Within limits, one could make the argument that any new damper is better than a 30 year old one. But, that is not really the answer I am looking for.
2.) Do any feedbacks exist about lifetime, etc.?
Since the 91GT is currently under the knife for the 30 year maintenance, I really would like to replace the harmonic damper now.
#26
Rennlist Member
I changed the damper on my 86 900 turbo in 2005 and the motor became really quite and pleasant again. I can believe that this is a part with a finite life based on common sense and that experience.
So, here some interesting questions about this product:
1.) Are there different parts for the various engines (GT, OB, S4)? I believe the factory has different part numbers. This would make sense, because any damper needs to be tuned to the characteristic frequency of the system. Within limits, one could make the argument that any new damper is better than a 30 year old one. But, that is not really the answer I am looking for.
2.) Do any feedbacks exist about lifetime, etc.?
Since the 91GT is currently under the knife for the 30 year maintenance, I really would like to replace the harmonic damper now.
So, here some interesting questions about this product:
1.) Are there different parts for the various engines (GT, OB, S4)? I believe the factory has different part numbers. This would make sense, because any damper needs to be tuned to the characteristic frequency of the system. Within limits, one could make the argument that any new damper is better than a 30 year old one. But, that is not really the answer I am looking for.
2.) Do any feedbacks exist about lifetime, etc.?
Since the 91GT is currently under the knife for the 30 year maintenance, I really would like to replace the harmonic damper now.
Greg Brown makes his damper the same for all 928 engines so I'm sure Porsche must have too since tuning for different engines is kind of a guessing game as all engines have their own individual idiosyncrasies.
#28
Rennlist Member
Something to remember is that the ATI Superdamper itself is an item that has been around for quite awhile. ATI, and more importantly, Greg Brown, have produced a center hub specific to the 928 crank shaft. The actual balancer itself is a relatively common ATI piece.
To my knowledge, it is spec'd out for a big block Chevrolet V-8. This ATI damper is a known, reputable quantity in the American V-8 engine world, as well as others, and has been for years.
http://www.atiracing.com/aboutati/aboutati.htm
http://www.atiracing.com/products/dampers/index.htm
To my knowledge, it is spec'd out for a big block Chevrolet V-8. This ATI damper is a known, reputable quantity in the American V-8 engine world, as well as others, and has been for years.
http://www.atiracing.com/aboutati/aboutati.htm
http://www.atiracing.com/products/dampers/index.htm
#30
Drifting