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Originally Posted by RamboLambo
So when you look at the other gearbox sizes, one thing sticks out in terms of strength. First is the crownwheel size and what may be 2nd, is shaft diameter. From peoples use of the various gearboxes, it does seem like, for current power usage, shaft spacing is not a great factor in strength, nor is gear size, given the perhaps smaller size of the ZF gears (width)
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Not sure that I can entirely agree with that analysis of gear size relevance Lambo. In reality it is the gears that are shown here failing in the ZF. If they were considerably wider, then surely they would be quite a bit stonger and maybe able cope with the extra stress induced by shaft deflection?
Shaft spacing approximately dictates shaft diameter. Wanni states that shaft spacing of 79 mm on the ZF does not allow the shafts to be built strong enough. Interestingly the 930 shaft spacing is 76mm but the 3rd/4th gear width is 24mm ie 50% wider than the ZF. No-one has so far been able to document a 930 failure whatsoever. Maybe we should rename THAT thread!
Thanks for those UN1-13 measurements, I'll try and add them in later.
Cheers