Damper hub question

[cncguy987]

I have a call into ATI but since I won't get a call back until Tuesday, I thought I would also ask here. The damper is approximately 3 inches from the front face of the damper to the rear face of the hub. Is that length critical to the function of the damper? Would the damper not function correctly if I milled an inch of the hub? Doing this to align the belts and dry sump components.

[lefty o]

the further out it is, the more its going to be effective, as its on the end of the shaft. however i speculate in the real world the difference in effectiveness should be pretty miniscule. i myself would probably be more concerned with the fact you will have less contact are between the hub and the crank snout, and less effective keyway. as in it would now be more likely to slip/spin on the crank.

[cncguy987]

I have a ry45 damper that has 5 studs and a dowel pin. And no keyway. Thank you for your input.

[Kevin Johnson]

What did ATI say?

[cncguy987]

Well, alot of it was over my head but the rotating weight, rpm etc is all depended on the different rubber rings you can put in the dampener. The ry45 has no hub like any sbf or sbc has. You could easily take the hub off any damper if the rubber rings used where made for that situation. I would double keyway the snout for the reasons a previous post said.

[MadBill]

A crankshaft damper works on torsional vibrations so its distance from the front main is pretty much irrelevant.

[Kevin Johnson]

A crankshaft damper works on torsional vibrations so its distance from the front main is pretty much irrelevant.

https://patents.google.com/patent/US6089204A/en (Example)

I think ATI offers custom hubs in combination with an engineering fee. It would be an ideal world if axial vibrations were not an issue with high speed/output engines -- errr, motors.