Hi Guys how vital is it that the prop runs parallel down the chassis. When MK built my indi chassis it was for an oil cooled GSXR engine, I have managed to obtain a wc version but have noticed that the sump hangs under the chassis by a good 3" leavin me about 2" of clearance, I can lift the engine about 2" but that would mean the initial prop to the reverse box is not running parrallel, should I lift the reverse box 2 " as well and have the 2nd prop slightly out, or lift the reverse box 1 " so that the gradient is slightly less all through the run ofthe prop ?

Ideally the propshaft should have a slight tilt on each UJ - roughly 2 or 3 degrees - but the 2 ends should be parallel. Hard to explain in words, try this picture (it shows a truck transmission, but the idea's the same).



Basically, if a UJ runs absolutely straight the bearings rattle around and damage the housings - brinneling, it's called. A very slight bend stops this happening. The angle can be side-to-side, up-and-down, or a combination of both.

[Edited on 25/5/08 by David Jenkins]

thanks for that David, Ill just raise the engine making sure that the flanges stay @ 90 degrees to each other !

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Originally posted by Taz Surfleet
thanks for that David, Ill just raise the engine making sure that the flanges stay @ 90 degrees to each other !

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I stand corrected !!

You will probably want to raise the reverse box by around an inch to inch and a half to get then angles on the prop nice as mentioned in the posts above. Have a play around with it before final fixing to get the UJ angles similar on each prop