Simple Solution to excessive NSR Crown Channel and Pinon Wear (paraphrased from Russell’s email)
The OEM brass axle spacers on the outside of the motor pod bushings reduce movement of the crown gear “landing” or “channel” for the Motor shaft. With the spacers against the bushings on one side and the wheel on the other, the axle has very little side to side play. The crown can then be set-screwed in the proper location for best gear mesh.
Additionally: you can trim the Motor Shaft to prevent Any contact with the channel on the crown.
ALTERNATELY: “Axle Stop-Collars” like the one below the chassis in this picture, can be used on both sides instead of the brass spacers. The effect is the same, except the Stop-Collars must be carefully adjusted with an allen wrench to prevent too much friction with the bushings.
// JOHNS ISSUE REPORT //
After having major wear issues with the NSR aluminum-collar crown gear last week in practice, I installed a NSR crown gear with Brass collar. One thing I see is that the Valley-depth of the NSR crown gears (alloy or brass) forces the motor shaft against the left flange of the crown. That’s why the aluminum crown was so worn even with lots of grease. After carefully moving the pinion to allow clearance, it appears to work ok after about 45 minutes on the test roller. The brass NSR crown gear shows signs of gear teeth slightly binding as it did with the aluminum gear. Are other racers having the same issues with your NSR F1 gears?
I also tried a Slot.IT Brass-collar crown which is only .001 larger in axle diameter than the NSR. I ran the Slot.IT crown gear on the roller for 30 minutes at 4 volts. The fit and mesh seem far better than the NSR. See no vibration or out of round issues with the Slot.it gear.
I will put it on track next week. If it works, I would like to Propose the rule allow Slot.IT crowns.
I want the F1 series to be successful.
Lotus Jr.
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"... get on your bad motor scooter and ride!"
Sammy with Montrose