Quote:
Originally Posted by spannermanager
I dont think the sound was wheel hop as we normaly think of it, as your description suggests a slippery road and a limited slip diff, its possible it was the diff action causing it. ive come across this with salisbury type diffs ( plate type) i.e ZF, when the lightest wheel 'judders' slightly as it searches for grip, mainly on a high percentage preload, say 75% 'ish...
,it could be the trans movement in which case you need a better front mounting, i had a box moved right forward like yours and used a simple welded in lower strap and removable top part to clamp it solid, a bit like the ones you can buy, no front mounting, it was removed, worked fine for years, hope this helps...
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That's an interesting point, thanks. If it still judders after some solidifying I'll have to go with that theory.
Good to know about your setting, thanks.
Quote:
Originally Posted by evilC
With the Scooby engine you are adding a significant extra weight on the end of a cantilever (the horns). Also, the power generated by a EJ20 T will put a considerable torsion load into those stressed horns as well. With the relatively solid mid mount I suspect its all rotating around that especially if you have a soft front mount. My first suggestion would be to use a stiffer front mount and dispense with the midmount it can then only rotate around that front mount. Solid mounting the rear mount I am told does not necessarily increase NVH but I would only treat that as a desparate solution.
Because of the weight of the whole drivetrain the rear end ought to be stiffened and a 5 bar cup brace should be used. The 5 bar unit creates a triangulated structure that provides a very stiff unit whereas the 3 bar just tries to hang the horns off the forged arm that the top damper mount hangs on - it wasn't designed for the forces involved and is a structurally unsound principle. As you have a Scooby then heat exchangers are not a problem so a 5 bar unit will fit - right?
Spannerman has got a point about the ZF lsd especially in the traction/no traction circumstances of late season snow/slush driving
Good to see you out of hibernation!
Clive
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Thanks Clive, I think the engine/tranny is rotating about the rear mount, I say that based on how much the tranny is moving up and down. However, I've been wrong before
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...*googling "NVH"*.... Ok, got it.
I think maybe you misunderstood my plan? I currently have NO front mount, just a rubber mid mount and a rubber rear mount. My plan was to change out the rubbers in the mid-mount for solid pieces or add a strap to the mid section like the ones offered by EMPI.
That's a good point about the 3/5 bar. IMO the 3 bar will do a good job of stabilizing (not supporting) the shock mounts, but has a limited role in supporting the engine. The ultimate solution would be a traction bar like is offered for aircooled motors since that would take a lot of the stress off of the frame horns. The only problem is I no room, and I would have to mount it to the inner fender sheet metal, most of which has been removed to fit the engine.
Mike