Xnke Posted August 5, 2012 Share Posted August 5, 2012 (edited) One of my upcoming projects hinges on setting a 6-rib flat belt up on the crank of an L-series engine, in addition to two v-belt grooves and a 36-1 VR trigger wheel. For this project, a 280ZX or 81-84 Maxima damper appears to be a good starting point. After obtaining a suitable unit, I realized that the "backplate" of the ZX damper is about 1/8" thick, and is about 7" diameter. This should lend itself well to forming the trigger wheel. Problem is that it's on the "damped" side of the assembly, isolated by the rubber ring. I can't see the front and back ends of the rubber ring on this pulley, nor on other Z L28 damper I have here in the shop. Does anyone have a dissasembled ZX damper that they can post photos of? Also, does anyone know about how much the damper ring will "wobble" at speed? The way I understand how these dampers work is to absorb torsional vibrations That would seem to imply that the outer ring of the damper "slips" +/-X degrees relative to the crankshaft, as opposed to the hub of the damper; which would remain hopefully fixed in position. This in turn, leads me to believe a crank trigger wheel machined into this backplate would also tend to "move" in relation to the crankshaft, when rotating at speed. How is it done on the 81ZX turbo, with the crank angle sensor? Is the trigger wheel fixed to the damped outside ring, or the inner hub? Other than the obvious "when the rubber separates and the ring slips your timing will be wrong" problem, how much timing slop could I expect? Edited August 5, 2012 by Xnke Quote Link to comment Share on other sites More sharing options...
Xnke Posted August 8, 2012 Author Share Posted August 8, 2012 Bueler? Bueler? Quote Link to comment Share on other sites More sharing options...
beermanpete Posted August 8, 2012 Share Posted August 8, 2012 I can't say what the actual movement of the damper ring is but since timing accuracy is important I would not use the damper ring to trigger the ignition. You should mount the 36-1 wheel to the hub of the damper. Quote Link to comment Share on other sites More sharing options...
Xnke Posted August 10, 2012 Author Share Posted August 10, 2012 Sure, the problem is getting room to do so. That issue may be solved; though....depends on if this 4-banger car actually shows up or not. Quote Link to comment Share on other sites More sharing options...
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