1. If you are using Tracy's gear box it is a good idea
 to use the 3rd gen RX7 13B high capacity oil pump.

 2. If you are using a turbo make sure you have
 separate oil lines from the main oil gallery in
 the block going to both the turbo and Tracy's gear
 box. Do not run one line and T it to both the turbo
 and the gear box.


 Paul Lamar


 Sounds ominous.. Hopefully Dave has a runnable airplane for racing.

 Good information though.


 Matt-



 Paul has anyone ever measured the flow on the return line on
 one of Tracy?s gear boxes? When I modified my Ross drive to work
 like Tracy?s I wasn?t sure what size hole to put in the sun gear
 to feed the system.


 Mark Kirkpatrick

 MSK6 20B

 Not to my knowledge but it would be certainly be interesting.

 The Ross is a different animal. There are no pressure fed
 plain bearing. All bearings are needle or roller so it
 needs far less oil. IMHO it is a far better design
 and lighter weight by about 10 pounds. I wish somebody would
 start making it again. I don't recall the orifice size recommended
 by Ross but I would guess about one quart per hour. It would
 be nice if it had its own oil supply, oil circulating pump and
 oil cooler.


 Paul Lamar

I modified my Ross to pressure feed the sun gear. I used the small hole in the gear as my guide for size. If you have a chance and have one of Tracy�s drive apart I would like to know what size hole he used. Did you mean a quart a minute or a quart and hour. At a quart an hour it seems to me that wouldn�t carry much of the heat away.

Mark KirkpatrickMSK6 20B

That is one of the problems using engine oil.
The gear box itself does not add a lot of heat.

Paul Lamar

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