X-Mozilla-Keys:                                                                                 
grobbins wrote:

I can vouch for the durability of the change gear sets. I ran them
behind my homemade 4 rotor in my also homemade Outlaw Dirt Late Model.

(pictures at the bottom of the page at http://www.grannysspeedshop.com
).
Quickchange rear housings are made entirely of either aluminum or
magnesium. The change gears themselves are available for $54.95 a set,
made of 8620 heat treated, and CNC machined. Standard ratios are
available from 1.00:1. to 1.70:1 and even higher in about 40 steps.
They are available in either straight cut (cheapest) and helical. Gear
widths are either 1-1/4" or 1-5/8". Shaft center to center distances
are standardized and the dimension is around 4". Shaft bearings are a
combination of (2)1207 and (2)1305 bearings, for a total of 4 bearings
(the rear cover contains the smaller bearings).  Lubrication is splash
only. The most punishment is inflicted on them by the World of Outlaws
sprint car guys, at 850+ horsepower for up to 50 lap main events,
often without any yellow flags. There are no transmissions, so the
change gear speeds are in the 6500 to 8500 RPM range. It wouldn't
require much more than simple engineering to quickly build a PSRU
using these gears, even if it took 4 to get the ratio and rotational
direction right.
I have rebuilt many industrial transmissions that used straight cut
planetary gearsets, and the ring gears alone are heavier than the
change gear sets. Add to that the weight of the hub the ring gear is
attached to.
By the way, my name is Grant.

 
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