Have Damper Doctor rebuild my harmonic balancer
#31
Rennlist Member
Thread Starter
Jeff, to my very uneducated knowledge, there were three main color dampers:
Orange, up to early S4 years
Black, GT's
Green, GTS's
That's what I know, though it doesn't necessarily seem right.
I suspect the harmonics of the crank was similar enough from the original 4.5 on up through the early 5.0 S4.
The 5.0 GT crank was different.
The 5.4 GTS crank was different still.
To my again limited knowledge, the ATI Superdamper is the only balancer Greg Brown uses on any of his stroker motors.
I am going to assume someone far more knowledgeable will chime in and set me straight.
Note: A stroll through PET and the Technical Spec books for all the years should shed light on balancer part numbers, applications, and crankshaft strokes.
Seth K. Pyle
Orange, up to early S4 years
Black, GT's
Green, GTS's
That's what I know, though it doesn't necessarily seem right.
I suspect the harmonics of the crank was similar enough from the original 4.5 on up through the early 5.0 S4.
The 5.0 GT crank was different.
The 5.4 GTS crank was different still.
To my again limited knowledge, the ATI Superdamper is the only balancer Greg Brown uses on any of his stroker motors.
I am going to assume someone far more knowledgeable will chime in and set me straight.
Note: A stroll through PET and the Technical Spec books for all the years should shed light on balancer part numbers, applications, and crankshaft strokes.
Seth K. Pyle
#32
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#33
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#34
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I mentioned ATI part no. 917020 here before. That is a Chevy SB damper, about $ 283.00 at Jegs. The hub is fairly easy to fabricate or you can probably get it from ATI. https://rennlist.com/forums/928-foru...-damper-3.html (post 33).
Åke
Åke
#35
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#36
Rennlist Member
I mentioned ATI part no. 917020 here before. That is a Chevy SB damper, about $ 283.00 at Jegs. The hub is fairly easy to fabricate or you can probably get it from ATI. https://rennlist.com/forums/928-foru...-damper-3.html (post 33).
Åke
Åke
#38
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#39
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I like to know if Mr. Brown is using the same damper for a stock S4 engine vs. the stroker engines he is building?
Another question if we order a factory damper from Porsche how can we know it will work properly? The damper can have been stored on a shelf for quite a number of years. How fresh will the rubber be?
Åke
Another question if we order a factory damper from Porsche how can we know it will work properly? The damper can have been stored on a shelf for quite a number of years. How fresh will the rubber be?
Åke
None of the stock 928 crankshafts are externally balanced, nor are any of my crankshafts, so the dampers are all neutrally balanced.
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
#40
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I once read that, too. I was placing an order for 10 units and asked if this was true. ATI laughed at this thought. They told me that I'd bought 10X the number he had, at that point in time.....and they were not about to give someone an exclusive when only selling a few dampers.
#41
Developer
I do believe Carl at one time said he had exclusive rights with ATI for their hubs for the 928.
#42
Developer
Just came from Damper Doctor's website. Very interesting, let me know what you think of it when you get yours back. It will still be a mass damper, but hopefully with the newer silicone-rubber, you will feel better about it.
#43
Rennlist Member
I've learned quite a bit reading this thread.
Thanks to all of you!
Thanks to all of you!
#44
Rennlist Member
Thread Starter
Understood, Carl.
However, at this point, I'm not sure I am going to have my original balancer rebuilt.
I am thinking long and hard about the ATI Superdamper.
Seth K. Pyle
However, at this point, I'm not sure I am going to have my original balancer rebuilt.
I am thinking long and hard about the ATI Superdamper.
Seth K. Pyle
#45
Rennlist Member