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.
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. Godfrey -- 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.
