Godfrey DiGiorgi wrote: > On Apr 8, 2008, at 2:21 PM, mike wilson wrote: >>> The fact that the primary drive was a helical cut gearset both >>> quieted >>> their operation and increased the amount of power they could handle, >>> for the materials etc used, at a small expense in power consumption. >>> If he was breaking gears, it was because he was reaching the material >>> limits for the production drive gears, not because they were >>> helically >>> cut. >>> >>> Straight cut gearsets produce lower power losses but require more >>> durable materials and better production qualities (precision >>> grinding, >>> heat treating, etc) to withstand the loads, that's why they're much >>> more expensive (aside from the fact that they are made in very small >>> quantities...). >>> >> The _big_ advantage of straight cut gears for ultimate power output is >> that they do not produce (well, they shouldn't...) any side loads. >> It's >> often the helical gears trying to force themselves apart along the >> axis >> of the shafts that causes problems.
Exactly. > While that it certainly true in theoretical terms, it isn't all that > big an issue given the maximum torque and power output that the > single cylinder Ducati engines could develop in racing trim. The big > problem with primary drive lifespan was always materials related ... > cast gears rather than forged and machined from billet like the > racing models. As I understand it, my friend's problem *was* with the side loads. I don't know the details but he's a very experienced and talented engine builder (4 national championships, two with the Ducati) and I trust his word on it. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
