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Bore Dia. Min/Max: 0.9436 / 0.9446
Degree Marking Range: TDC
Degree Markings: Yes
Engine Balance: Internal
Finish: Black Zinc
Keyway: Single
Length: 1.927
Material: Steel
Mounting Hardware Incl.: No
O.D.: 5-3/8"(5.375)
Safety Rating: SFI 18.1
WT. in lbs.()=Rotating weight: 6.9 (4.6 Rwt)
Critical harmonic vibrations occur numerous times in a engine’s operating range. Stock rubber and elastomer-type dampers are frequency sensitive “tuned absorbers”, and work at only one critical frequency. In the case of a stock rubber damper, it is tuned for a factory engine’s critical harmonic vibrations. If you change the mass of pistons, rods, or the crankshaft, you change the natural frequency of the crankshaft assembly; therefore, the stock damper is no longer tuned to the new frequency of vibration, and you may be headed for early failure of expensive engine components. Dampers also create heat while they work, and rubber is a poor dissipator of heat. This heat and the exposure to the elements deteriorates rubber, causing it to crack and change durometer, which then leads to inertia ring slippage, damper failure, uncontrolled torsional vibration, and costly engine parts breakage.
