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Products > Suspension & Chassis > Penske 8981 Two Way Adjustable Rear Shock
Penske 8981 Two Way Adjustable Rear Shock
The 8981 Damper, which utilises the 8100 series adjuster offers a wide range of compression adjustment for the serious racer. The method in which the Penske 8100 adjusts compression forces is simple. When the damper is put into a compression condition, the fluid being displaced by the shaft entering the body must pass through the compression adjuster drum and the selected orifice located in the remote reservoir. As the knob is rotated, a drum inside the compression adjuster is rotated, aligning the chosen orifice within the direct flow of oil into the remote reservoir. The adjustment knob is numbered from one to six. By clicking to the number one position, the adjuster is set at full soft (utilising the largest hole in the adjuster drum). The number six position on the knob denotes a full hard setting (oil flow is greatly restricted). The orifices make every adjustment have a noticeable feel and have increased the range of adjustment. At higher shaft velocities, oil passing through the orifice in the compression adjuster drum reaches a maximum flow rate because of the viscosity of the oil and the hole diameter. At this point any additional oil flow is metered through a blow off valve which bypasses the drum completely to ensure a linear adjustment range. The 8900 series shock is completely owner rebuildable and revalveable if desired, resulting in fewer costly visits to your service centre. Remote / integral reservoir contains increased nitrogen volume for more consistent damping over a long race. A floating piston separates the nitrogen from the oil, rather than a bladder type device that can fail. Fully CNC machined 7075-T6 aluminium construction. Hard anodised finish, making the unit both light weight and strong. Heavy duty 5/8 diameter chrome plated chrome-moly shaft. High quality spring steel valve shims make up the main piston valving, which can be changed by the owner to customise the damping characteristics of the shock. Adjustable spring pre-load. The best spring available - matched to your weight. 25 click rebound adjuster for extra fine rebound settings. Low friction / stiction shaft bearing and high quality seals and wiper to keep out dirt. Adjustable length eyelet, maximise rear ride height without removing the shock from the motorcycle. Please Note: Standard springs are finished in black. The blue Hypercoil springs (as pictured) are available as an extra cost option. Also available is the Three way adjustable 8987 race shock. Please contact us for details.
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