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The theory behind the power pulley is that a reduction in the speed of the accessory drive will
minimize the parasitic losses that rob power from the engine. Parasitic power losses are a result of the energy that the engine uses to turn accessory components such as the alternator and water pump, instead of producing power for acceleration. In an attempt to minimize this energy loss, many companies claim to produce additional power by removing the harmonic damper and replacing it with a lightweight assembly. While a small power gain can be realized, there are a significant number of potential problems associated with this modification, some that are small and one which is particularly large and damaging!
When the crankshaft is revolving at an RPM such that the torque frequency, or one of the harmonic
sine wave frequencies coincides with the natural frequency of the shaft, resonance occurs. Thus,
the crankshaft RPM at which this resonance occurs is known a critical speed. A modern automobile engine will commonly pass through multiple critical speeds over the range of its possible RPM's. These speeds are categorized into either major or minor critical RPM's.
Major and minor critical RPM's are different due to the fact that some harmonics assist one another in producing large vibrations, whereas other harmonics cancel each other out. Hence, the
important critical RPM's have harmonics that build on one another to amplify the torsional motion of the crankshaft. These critical RPM's are know as the "major criticals". Conversely, the
"minor criticals" exist at RPM's that tend to cancel and damp the oscillations of the crankshaft.
If the RPM remains at or near one of the major criticals for any length of time, fatigue failure
of the crankshaft is probable. Major critical RPM's are dangerous, and either must be avoided or
properly damped. Additionally, smaller but still serious problems can result from an undamped
crankshaft. The oscillation of the crankshaft at a major critical speed will commonly sheer the front crank pulley and the flywheel from the crankshaft. I have witnessed front pulley hub keys being sheered, flywheels coming loose, and clutch covers coming apart. These failures have often required crankshaft and/or gearbox replacement.
Crankshaft failure can be prevented by mounting some form of vibration damper at the front end of
the crankshaft that is capable of absorbing and dissipating the majority of the vibratory energy.
Once absorbed by the damper the energy is released in the form of heat, making adequate cooling a necessity.
Available for Honda Vtec B16A B16B B18C B20B K20A K24A.
E-mail: firstname.lastname@example.org or contact Desmond
+60192149006 or +60122159006 for more information.
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