Mark,
It's explained very well here;
http://automotivethinker.com/transmission/straight-cut-gears-vs-helical/
Kevin V.
Tuscarora, Pa
On Feb 21, 2012, at 11:04 PM, Mark Haynes wrote:
> OK racers,
> Can someone explain to me why all of the racers want to use
> Straight cut gears
> in their transmissions? Straight cut gears (or spur gears) apply
> the torque
> load to only one tooth on each gear at a time, where helical gears
> (such as
> are commonly used in manual transmissions) apply the torque load to
> two to
> three teeth at a time. Thus the helical gears have less of a
> tendency to get
> damaged, where the spur gears take a beating.
> So what's the attraction? (Plus straight cut gears are whiny!)
>
> Or is it just the way in which they are engaged, Dogs vs conical
> synchros?
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