Leon Promet wrote:

Hi Ken,

There is NO way that I wouldn't be using the best stuff available.  I
ALWAYS put new gears in a motor,  and I always use the heat treated ones.
Stationary gears are the MOST highly stressed component in a rotary. As
such,  they are subjected to cyclic loads,  and any pieces of metal subject
to cyclic loads eventually fatigues. (Aircraft Maintenance 101)

(You watch,  some hairy nosed wallaby is going to come bounding out of the
bush and tell me that Apex seals are the most highly stressed component..
 Don't.  Apex seals only fail if you subject them to detonation,  and if
you motor is detonating,  you are not tuning it properly!!).

I've seen lots of gears fail over the years.  If a rotor gear cracks,  you
will know about it,  but it's not as critical,  ... if a stationary gear
lets go,   nothing good has EVER came of a collapsed one of those.

The FD '92~ on REW turbo gears are probably overkill for an NA engine,  so
use the FC3S turbo "89~'91 gears,  which are a LOT cheaper than the REW
gears.  They are heat treated anyway,  and I've never seen one break.  I've
been using them for years,  ever since they became available,  in
Bridgeport and PP engines that spin to 9,500 RPM.

What we are looking for here is reliability AND piece of mind. So get a
gear,  place it on you desk,  and meditate on the fact that your butt is
going to hang at any time on one of those little teeth.  If one SHOULD
fail,  your butt falls out of the sky.  Then ask yourself,  ... what is my
life worth ... the price of two of these little suckers??  Only you can
answer that question for yourself..  I reckon it's CHEAP Life Insurance
Ken!!

Best wishes and kindest regards,

Leon Promet
leon@promotorsport.com.au

 
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