High-Performance Harmonic Damper for the Porsche® 928
Custom-engineered for Modified Motors!
Think about it. We make so many changes to the 928 engine in our love of HP and performance, yet we bolt up the same old, tired, harmonic damper to the front of the crank each time. Why do we expect no harm will come from this?
The stock 928 damper was good in its day, it is a dual-plane mass damper with a single elastomeric seam in it; but even if it was in perfect condition (and none of them at this age are) they are still miss-matched after we start raising the redline, changing the crank stroke, bore, or both, and changing the flyweight of the rods and pistons.
There are 928 racers who have reported multiple failures of the stock 928 damper in their race applications. Their damper failed in a catastrophic way (it came apart!) but there are countless more engines damaged silently by the wrong damper.
The harmonic damper is responsible for two things: to absorb the vibratory harmonics and to counter-react torsional oscillations of the crank. Let’s take each separately.
The 928 Motorsports LLC Custom Harmonic Damper:
Rather than a single elastomeric ring like the stock 928 balancer, our balancer has 8 separate synthetic rings that will be matched precisely to the harmonics of your engine by ATI engineers. Thus, these dampers are custom-tuned to your initial engine setup after you answer a few questions for us.
After that, the damper can be re-configured should you make even more changes to your engine.
The ATI Super Damper®, U.S. Patent #5,425,287, is the only damper designed exclusively for high RPM performance engines. The proven elastomeric design is actually two dampers in one: a 4" inner diameter and a 7" diameter damper contained in 2 shells that bolt to the crank hub. The inner and outer shells are available in steel and in aluminum to contain the steel inertia weight.
The inertia weight has 8 computer-machined grooves to retain the proper durometer o-rings (dyno tested for each application), and installed at ATI. O-ring life has been tested to over 3 million cycles in Nextel Cup competition (6500+ RPM, 500+ miles) and 10 years (188 - 11 round weekends) in drag racing. The unit is rebuildable to new specifications by installing new O-rings.
All units are SFI manufacturer certified and exceed SFI spec. 18-1.
Custom Damper Application for your Porsche® 928
928 Motorsports LLC® has done all the work for you! We already have the crankshaft snout profiles, and full dimensional specifications in a fixture at ATI. We have also designed-in elements to work with the unique Porsche 928 characteristics (like our firing order, for example).
All we need from you when we order your Custom Harmonic Damper is:
Bore: Stroke: Max RPM: HP need:
…we will take care of the rest!
*The 928 Motorsports LLC/ATI Custom Damper is a Special Order item and is not returnable.
Please allow 3-4 weeks for delivery.
Shipping: $22 in S&H for the 48 contiguous states and will be shipped insured. Additional shipping fees apply for International - email us your address and we will get you a shipping quote.
* Domestic US shipping shown. International shipping will be calculated based on location.
Phone: (920) 485-0928
928 Motorsports, LLC - All Rights Reserved