Have Damper Doctor rebuild my harmonic balancer

Reply Subscribe

Thread Tools

Search this Thread

01-25-2017, 01:09 PM

#31

skpyle

Rennlist Member

Thread Starter

Join Date: Jul 2014

Location: Blacksburg, SC

Posts: 2,886

Likes: 7

Received 469 Likes on 212 Posts

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

Reply Like

01-25-2017, 02:34 PM

#32

BRB-83-911SC

Rennlist Member

Join Date: Jul 2005

Location: Woburn MA

Posts: 1,063

Likes: 24

Received 85 Likes on 41 Posts

Quote:

Originally Posted by skpyle

Jeff, to my very uneducated knowledge, there were three main color dampers:

Orange, up to early S4 years
Black, GT's
Green, GTS's

To confuse matters:

M28/21 and M28/22 engines (84-86 Euro 16V) have a green damper. At least mine does, as do the others I have seen.

Attached Images

Reply Like

01-25-2017, 02:52 PM

#33

Randy V

Addict
Lifetime Rennlist
Member

Join Date: Jun 2000

Location: Insane Diego, California

Posts: 40,429

Likes: 25

Received 92 Likes on 62 Posts

Quote:

Originally Posted by GregBBRD

I took apart a GTS engine with 240,000 miles on it, this last year. The rod bearing were the absolute best set of rod bearings I've ever seen. They looked like someone had put them in the week before I took the engine apart....virtually no wear anywhere.

Sounds familiar.

Quote:

Originally Posted by skpyle

I searched through alot of 'balancer', 'harmonic balancer', and 'damper' threads before I posted my own.

Use the 'search titles only' option to get better results.

Reply Like

01-25-2017, 03:08 PM

#34

Strosek Ultra

Rennlist Member

Join Date: Feb 2011

Location: Mostly in my workshop located in Sweden.

Posts: 2,226

Likes: 236

Received 442 Likes on 244 Posts

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

Reply Like

01-25-2017, 03:36 PM

#35

FredR

Rennlist Member

Join Date: Jun 2005

Location: Oman

Posts: 9,697

Likes: 76

Received 663 Likes on 540 Posts

Quote:

Originally Posted by dr bob

And, at this point I've told you more than I learned in the correspondence course from Don Bentley.

Is that the Bentley in Bentley Devada?

Rgds

Fred

Reply Like

01-25-2017, 03:38 PM

#36

hwyengr

Rennlist Member

Join Date: Jan 2004

Location: Peoria, IL

Posts: 1,012

Likes: 58

Received 186 Likes on 110 Posts

Quote:

Originally Posted by Strosek Ultra

I do believe Carl at one time said he had exclusive rights with ATI for their hubs for the 928.

Reply Like

01-25-2017, 05:27 PM

#37

skpyle

Rennlist Member

Thread Starter

Join Date: Jul 2014

Location: Blacksburg, SC

Posts: 2,886

Likes: 7

Received 469 Likes on 212 Posts

BRB-83-911SC: Like I said, uneducated. Sorry about that.

Seth K. Pyle

Reply Like

01-25-2017, 05:37 PM

#38

BRB-83-911SC

Rennlist Member

Join Date: Jul 2005

Location: Woburn MA

Posts: 1,063

Likes: 24

Received 85 Likes on 41 Posts

Quote:

Originally Posted by skpyle

BRB-83-911SC: Like I said, uneducated. Sorry about that.

Seth K. Pyle

No worries - just wanted to add that data point in case someone stumbled upon this in the future. From what I have seen from your posts, you are far more educated than me

Reply Like

01-25-2017, 06:04 PM

#39

GregBBRD

Rennlist
Basic Site Sponsor

Join Date: Feb 2005

Location: Anaheim

Posts: 15,219

Likes: 394

Received 2,451 Likes on 1,459 Posts

Quote:

Originally Posted by Strosek Ultra

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

Same damper on both.

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!

Reply Like

01-25-2017, 06:08 PM

#40

GregBBRD

Rennlist
Basic Site Sponsor

Join Date: Feb 2005

Location: Anaheim

Posts: 15,219

Likes: 394

Received 2,451 Likes on 1,459 Posts

Quote:

Originally Posted by hwyengr

I do believe Carl at one time said he had exclusive rights with ATI for their hubs for the 928.

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.

Reply Like

01-25-2017, 06:37 PM

#41

Carl Fausett

Developer

Join Date: Dec 2001

Location: Horicon, WI

Posts: 7,005

Likes: 0

Received 59 Likes on 43 Posts

Quote:

I do believe Carl at one time said he had exclusive rights with ATI for their hubs for the 928.

No, of course not. I was the first to develop a hub for the 928 crank they told me, but they will make a hub for just about anything if you ask. Our damper may differ from Greg's as we have the elastomer bands changed to match our stroke and HP levels. That's what you are really trying to buy: a harmonic dampener to match the expected resonance of your crank, based on the build.

Attached Images

Reply Like

01-25-2017, 06:46 PM

#42

Carl Fausett

Developer

Join Date: Dec 2001

Location: Horicon, WI

Posts: 7,005

Likes: 0

Received 59 Likes on 43 Posts

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.

Reply Like

01-25-2017, 06:59 PM

#43

deutschmick

Rennlist Member

Join Date: Nov 2006

Location: TX

Posts: 3,234

Likes: 265

Received 96 Likes on 72 Posts

I've learned quite a bit reading this thread.

Thanks to all of you!

Reply Like

01-25-2017, 07:00 PM

#44

skpyle

Rennlist Member

Thread Starter

Join Date: Jul 2014

Location: Blacksburg, SC

Posts: 2,886

Likes: 7

Received 469 Likes on 212 Posts

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

Reply Like