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Old Jan 24, 2011, 06:06 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
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Question
Cox Olympic 15 Rear Rotary Valve. See video!

I have been watching this on eBay and the price seems to have gone exponential in the last 12 hours. What's it really worth?

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

Jason
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Last edited by Jason_WI; Jul 04, 2012 at 10:11 PM. Reason: Changed title
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Old Jan 24, 2011, 10:54 PM
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Medalion 15

If you read the description you will find it has some "History".... Always worth a few extra bucks.
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Old Jan 24, 2011, 11:26 PM
"Unnecessary Necessity"
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Only 20 were made, Bill Attwood special....Like finding a Rembrant at the fleas market
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Old Jan 24, 2011, 11:49 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
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It went for $760.
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Old Jan 25, 2011, 12:17 AM
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What's it really worth? It's worth $760. Like the stock market.. Ebay is a true and honest market. It is what some entity is willing to pay for a commodity at a given second.
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Old Jan 26, 2011, 10:00 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
571 Posts
Quote:
Originally Posted by skaliwag View Post
What's it really worth? It's worth $760. Like the stock market.. Ebay is a true and honest market. It is what some entity is willing to pay for a commodity at a given second.
True.

I can't hide it any longer - I was the highest bidder!

I was looking for a nice RR1 and spotted this. This is a piece of Cox history and it can only go up in value unlike my $4000 Alienware laptop that is now only worth $400.

I hope to get it next week and will post more pictures.

Now the question - Do I clean it? Even dare to take it apart?

It is probably gummed up from the castor. The part that worries me is the rotary valve plastic body. Probably brittle from age. I have one 15 wrench on the way but will need 2 to do internal cleaning. Maybe I'll just clean the outside and leave it alone but eventually curiosity will get the best of me to see whats inside.

Jason
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Old Jan 28, 2011, 01:26 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
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I got the Olympic rear rotary engine today. As I suspected the rear rotary plastic body has 3 cracks in it. I could see one crack in the pictures but not the other 2. It looks like it is made some type of resin and not actual delrin. I'm not sure what resin was available in the late 50's early 60's.

There is also a label on the bottom of the plastic drum that has Special Cox 15 Racing 1959 on the bottom. I wonder if this came from Cox with the lable on it. I want to preserve the lable but I also want to clean it up.

Here are the pictures of the crack and lable.

Jason
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Old Jan 28, 2011, 01:54 PM
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Thanks for posting the pics Jason,

I can't wait to see what's inside!
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Old Jan 28, 2011, 05:23 PM
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Wow! $760 but as a type A version it is rare indeed.
This site gives some more detail and a view of the parts of the type B
http://www.mh-aerotools.de/airfoils/..._15_rotary.htm
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Old Jan 28, 2011, 08:22 PM
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Quorneng,

Thanks for posting that link. I have been to Martin's site many times, but had never found that page.
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Old Jan 29, 2011, 12:38 AM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
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I managed to get the cylinder off and also the venturi. I also got it to turn. Heat does wonders.

The cylinder ports are polished to almost a mirror finish. They are flat and wide. The piston is a ball socket type. The drum rotates in an aluminum bearing with the rear plastic sealing it from the outside.

I will get pics tomorrow. I have to make a spanner to take the rear drum off so it may be some time before I can get the drum off. I plan to make a new rear drum plastic piece as it is cracked around the venturi input. Use the original to cast a rubber tool mold and then pour a new one from the mold.

Jason
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Last edited by Jason_WI; Jan 29, 2011 at 01:36 AM.
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Old Jan 29, 2011, 01:39 AM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
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I made the spanner and I got the rear drum off. The rear rotor has 4 holes around the disc. 3 are close together and one 180 degrees apart.

I have everything soaking in old glow fuel except for the rear plastic piece and will clean up all the parts with a soft tooth brush.

Jason
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Old Jan 29, 2011, 01:54 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
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I Last night when I took it apart I did not take note which hole the crank pin was on in the rotary valve I'll have to figure that out.

The venturi is also polished to a mirror finish. The rotary valve edges are also sharp. This was definitely made for racing.


Pictures as requested:
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Old Jan 29, 2011, 02:23 PM
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Is the piston a three piece piston with a plate holding the rod end in, secured by a circlip? That is how the Spacehopper, and previous 049 pistons were made.
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Old Jan 29, 2011, 02:38 PM
Cox Engine Hoarder
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Neenah, Wisconsin, United States
Joined Jun 2004
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It is a ball socket type like the newer 049. I do not think Cox offered a 15 piston reset tool did they?

Here are pictures of the engine all cleaned up and ready for the display case.

I was surprised that 50 year old bearings are silky smooth. Nothing like castor to protect them form rust.

Jason
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Last edited by Jason_WI; Jan 29, 2011 at 07:33 PM.
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