If you need 9,000 RPM it is probably a street gear box. Not a problem. Thestock bearings hold up fine.

.......IF. You keep the oil cool. Lite press fits hold the bearings in place in the case. Snap rings on the shafts.

Get the case too hot and bearing outer races begin to turn and wear out their holes. Bolt the tail shaft bushing into the housing with a flat head 10/24 screw counter sunk into the bushing. Now that bushing cannot move back and destroy the seal, or begin to rotate.  Install an "O" ring ahead of the rear seal. Hold the rear seal in the tailshaft housing with two wire hooks pulled forward by bits of screen door springs.

Now the rear seal cannot fall out, and seals even if the tailshaft housing overheats. This works all the way back to RX-2s and RX3s. This also works on fancy racing transmissions.  Shield the trans from the exhaust system. Run a pump and oil cooler if allowed. Use a synthetic racing oil in the transmission.

 

Never a problem..............Lynn E. Hanover

 

Charlie and Bill,  yes tracy used two needle thrust bearings as I have, but in practice there is nothing to hold the thrust washers either side of  the two bearings.  I just worry about that, but tracy's Box has done thousands of collective hours, so I possibly should throw my worry beads away.  Thanks Neil.

On 8/6/2017 4:10 AM, Charlie England wrote:

Neil,

If you're looking for the Mazda transmission input shaft bearing, here's a page from the parts manual. If you need the entire manual, email me at ceengland7@gmail.com & I'll send you the pdf.

Charlie

On 8/5/2017 11:29 AM, Charlie England wrote:

I think those are the thrust bearings, to handle the thrust of the helical gears in the planetary gearset. Is that what Neil's asking about?

On 8/5/2017 9:51 AM, Bill Schertz wrote:

I believe that Tracy's gearbox uses a stack of needle bearings to lower the rpm of each bearing to a better value
Bill Schertz

-----Original Message----- From: Neil Unger
Sent: Friday, August 04, 2017 11:54 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] bearing in mazda g/box

Gents,  I have suddenly realised that the main bearing on the Mazda
g/box input shaft would have to take 8/9000 RPM.  In my search most
bearings give out at 6,000 RPM.  Does anyone know just what bearing they
use?  Perhaps the number??   I realise i am the optimist. Thanks Neil.


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