Originally Posted by DFv2
So, why dont aftermarket UDP manufactures make the gear with a little rubber damper...win win?
And people, its DAMPER. You can dampen, or damp. Dampener is a laymans variation of the actual term damper.
And as far as rotating assemblies go - heres some food for thought. I'll preface this by saying that I have quite a bit of experience with the physics and engineering involved with rotating assemblies, resonance, harmonics etc etc.
Facts:
1) The stock pulley is a relatively poorly balanced, heavy cast piece. If left without a bushing, it would contribute to harmful vibes at specific RPM's. This is why, and is THE reason why ford put a bushing on there. It costs less to do this than it does to CNC / mill the pulleys individually from light materials. Duh.
2) The aftermarket UDP's are essentially zero balanced and very light. They are NOT the controlling factor in the equation due to their lessened mass and excellent balance. The cannot contribute to harmful resonance in the assembly.
3) If you rotating assembly has certain resonant RPM's, the little bushing on your stock UDP is NOT going to do all that much to damp the amplitude of the vibes. Sorry. Couple kilos of high-rpm rotating mass vs. a little piece of rubber. Rotating mass is the controlling factor everytime, and by a longshot.
So, while this was fun the discussion simply isn't even fruitful. Come to your own conclusions about the UDP argument. The facts are laid out for you. In the end, however, the 1-2 HP you may or may not see just might not be worth the trouble.
