Description:
These Powerforce SFI-Spec Racing dampers are the same as the 10-2139 Performance damper in that it reduces the rotational mass of the multi-groove OE unit, is degreed to +20, and feature easy-to-read timing marks (clear white against a painted black background). In addition, this damper meets the SFI-Specification for 1045 steel, and comes with a certification card. The SFI-Spec Racing Damper also has the added inertia ring, which feature a bonding process which adheres the elastomer to the I.D. of the inertia ring and the O.D. of the hub. Through subsequent research and development the Manufacturer has perfected a new process that utilizes a stronger adhesive along with an improved elastomer that creates a much stronger bond, effectively doubling the force required to separate the hub from the ring, making these dampers practically indestructible. Powerforce dampers quality is equal to or most often exceeds that of any other harmonic damper. You won't find any damper that is more accurately balanced or more closely machined for the correct fit. Powerforce products come with a one year limited warranty, including dampers used in racing applications. They are legal for SCCA's ITS class as OA diameter remains unchanged. Total alignment difference between pulleys should not exceed 1/8". Note: We strongly recommend using the special bolt-washer kit listed below. Please call if you have any questions or don't believe you need to use the bolt/washer.
Installation:
Please note that machining tolerances are in the thousandths of inches. It is normal to have slight variances in the factory crankshaft mating surface diameter. While the vast majority of these dampers that we have sold fit as they are supposed to, a small percentage have been difficult to seat due to those variances. If that is the case with your installation, your machinist may have to do very light machining to loosen the fit slightly. This is normally a very simple procedure for your machinist/rebuilder. Be certain first that both mating surfaces are free of paint, scrapes, and burrs. Again, this has only occurred on a handful of the dampers we have sold, and in almost every case has been easily remedied by a mechanic.
Model Guide:
Datsun 240Z, 260Z, 280Z, 280ZX
Model Restrictions:
For L-Series engines only. Not for use with smog pumps, power steering, or air conditioning.
Year Guide:
1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983
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