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» Cox .049 Tee Dee engines back in stock (limited availablility)
by Cox International Today at 1:27 pm

» Scientific "Zipper" Build...Zipper Flys!.
by akjgardner Today at 12:59 pm

» Golden Bee basic running problem
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» Throttles for Cox Tee Dee .049 / .020 / .010 engines --- videos
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» Introducing our Cox .049 TD Engines
by Admin Tue Jul 23, 2024 2:00 am

» Project Cox .049 r/c & Citabrian Champion
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» So to the rescue of an EZ BEE .049 r/c
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» Sturdi Built?
by rsv1cox Sun Jul 21, 2024 6:58 pm

Cox Engine of The Month
July-2024
robot797's

"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"



PAST WINNERS
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Post  DrCox Tue Jan 08, 2019 1:59 pm

Moderator, if this has been previously posted, then please remove.

Whether model or engine, post your hidden gem find. It's personally rewarding to see the talent on this forum bringing back gems, that at one time would have been relegated to the trash.

I'll go first.

Jason_WI wrote:
Gotta search eBay for the hidden gems. They may be mixed with other engines or mislabeled and can sometimes go cheap.

Many times searching is the key. Sometimes you win, other times a dud.

This one was questionable at best, however since there were no plier marks on this .010 glow plug or cylinder picture, I took a chance. Really, many times one should ask for more pictures from the seller.

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Saw the damaged venturi and gas tank which was not a concern. Upon receiving, then I noticed no .010 needle valve body. That was fun to source. Fortunately after heating and cleaning, the cylinder/piston, crankcase and crank were undamaged on this poor little engine.

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What the heck..replace the starter spring and give it a prop.

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Another engineering marvel saved from the trash.
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Post  Marleysky Tue Jan 08, 2019 4:19 pm

Hidden treasures. Ya gotta look close at the sometimes out of focus pictures, or in the background of the main item. I did not keep copies of the pictures of the e bay posting, but i did purchase a SkyCopter, used, abused, and in its original box. Inside the box was a little blob of gold and red. Won the lot, upon arrival it was a very runnable TD020. ScORE!
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Post  getback Tue Jan 08, 2019 5:26 pm

that's how i got my first . 10 TD and those last pics. lol Small Cox Logo
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Post  dckrsn Tue Jan 08, 2019 8:34 pm

Good score and a beautiful restore.
Just don't store her with that fuel tubing attached or near.
Here's why that tank was cooked.
https://www.coxengineforum.com/t11655-another-engine-tale-td-020
Bob
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Post  rsv1cox Wed Jan 09, 2019 7:15 am

Nice save on that Cox TD Doc. Colorful little creatures aren't they.

I have done many saves but my best Cox equipped model was the well damaged PT-17 shown as my avatar picture.

Bob
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Post  DrCox Tue Jan 29, 2019 5:46 pm

This one was a reasonable purchase at $26.00...or so I thought.

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Upon disassembling, some "gotchas" were discovered. The original crank was "somewhat" stiff when rotating within the crankcase along with no venturi or needle valve. Piston and cylinder was good. Decided to reassemble another custom TD .020. Used a new TD .020 crankcase while assembling with the original crank and prop drive plate for they were both easy to align and assemble. The anodization is just about all gone on the prop drive plate in contrast to the crankcase. Needed a new collet also. Thanks to Mike 1484 for his generosity of supplying the TD .020 spring to complete this expensive save.

Well this one was another lesson learned with eBay. Buyer beware while trying to make the best informed decision via limited seller pictures.

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Last edited by DrCox on Wed Jan 30, 2019 11:10 am; edited 1 time in total (Reason for editing : spelling correction)
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Post  Cribbs74 Tue Jan 29, 2019 11:28 pm

Who says you can’t make a silk purse out of a sows ear? Good job!
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Post  Jason_WI Tue Jan 29, 2019 11:53 pm

Cribbs74 wrote:Who says you can’t make a silk purse out of a sows ear? Good job!

Sometimes you can’t do that. Sad

https://www.coxengineforum.com/t2155-another-049-twin#32121
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Post  DrCox Wed Jan 30, 2019 11:08 am

Jason_WI wrote:
Cribbs74 wrote:Who says you can’t make a silk purse out of a sows ear? Good job!

Sometimes you can’t do that. Sad

https://www.coxengineforum.com/t2155-another-049-twin#32121

Man, was that a bummer of a deal, however loved the twin Golden Bee's running though.
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Post  DrCox Fri Feb 01, 2019 1:48 pm

This one was probably the best recent hidden gem find because of its listing. I was able to get it for a little over twice what I paid for my .020 back in 1971 ($6.98). Granted it is used, but I have a soft spot for Pee Wee .020s.

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Cylinder and Glow Head lacked the usual pliar marks, therefore I gambled and went for it.  It cleaned up quite well with isopropyl alcohol and disassembled with some coaxing of heat. I installed a starter spring and it seems like it will be a good runner. Upon further inspection I dated it to approximately 1958.

Reasons for approximately 1958 because: 1) No ThimbleDrome on the fuel tank, 2) Narrow neck crankcase nose and 3) No screen intake on back plate. Hopefully the experts here can correct me.

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Post  DrCox Tue Sep 24, 2019 2:33 pm

As a heads-up, keep searching through those non-descriptive titles.

Thought this was a Medallion .049, but was pleasantly surprised when delivered as a Medallion .09. Cleaned up well after disassembly with only a little heat to the rear crankcase. Isopropyl alcohol at 91% with a tooth brush to the engine and a small pipe tooth cleaner run through the needle orifice. Not an earth shattering price, but delivered for less than $30.00 with shipping.

Keep searching.

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Post  Mark Diedrichs Tue Sep 24, 2019 3:10 pm

Most excellent find, maybe next time we could scrub in with you Doc!!! Well Done!!!! Please watch the use of ether when cleaning up the engines, not sure how I know that!!!???, Mark Very Happy Babe Bee .049 Small Cox Logo lol!
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Post  rsv1cox Tue Sep 24, 2019 3:21 pm

Turned out beautiful Doc, absolutely beautiful.

Bob
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Post  DrCox Tue Sep 24, 2019 4:30 pm

Mark Diedrichs wrote:Please watch the use of ether when cleaning up the engines, not sure how I know that!!!???

Unexpected chuckle.  Laughing
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Post  Oldenginerod Tue Sep 24, 2019 5:19 pm

Mark Diedrichs wrote:Please watch the use of ether when cleaning up the engines

I've never known anyone to use ether for cleaning an engine- Too hard to get. You'd end up passed out on the floor anyway. Affraid or WOW!
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Post  DrCox Thu Nov 21, 2019 12:48 pm

Somewhat of a hidden gem off eBay. Possibly because of the title missing a descriptive term, there was not an abundance of bidders. This little .020 TD with RC exhaust restrictor was obtained for a "reasonable" price, whatever that term means.

Anyway, the little TD cleaned up nice only missing a couple of parts (tank back plate & fuel line). Really no biggie. Arrived as seller described, which is always great. I've fortunately had very good luck with eBay Cox engine sellers which keeps me searching.

My question revolves around the manufacturer of the throttle exhaust restrictor. The outside cylinder dimension was not reduced for proper operation of the throttle. The throttle operates smoothly over an aluminum outside cylinder sleeve. I would think that this method would also work great for the .010 TD.

So, anyone know the manufacturer of this slick exhaust throttle?

Thanks in advance.


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Post  ticomareado Thu Nov 21, 2019 2:12 pm

I've seen that set up somewhere before but can't pull it up on the old hard drive.
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Post  1/2A Nut Thu Nov 21, 2019 2:44 pm

I have that kind of throttle aftermarket came in a plastic clear case with
instructions on how to assemble it onto the cylinder. I have 3 of them
for 15 size engines 1 is on a Olympic the other two are on Sportsman
thin walled .15 engines. The clam shell method was the way to get
restrictors sleeves past the cylinders footings.

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Post  getback Thu Nov 21, 2019 7:54 pm

I have never seen this before , Who made it Brad ? Small Cox Logo Small Cox Logo
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Post  Marleysky Thu Nov 21, 2019 8:34 pm

getback wrote:I have never seen this before , Who made it Brad ? Small Cox Logo Small Cox Logo
I think I posted this before, but here it is .....

Pre dates Zip Codes, Detroit 4, Michigan

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Post  DrCox Thu Nov 21, 2019 9:13 pm

Marleysky wrote:
I think I posted this before, but here it is .....

Pre dates Zip Codes,  Detroit 4, Michigan

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Roto-Valve Manufacturing Co. Thank You Marlesky. That is one exhaust throttle that I never heard of before yet, one very well manufactured throttle. The cigarette paper as a gasket suggestion from the company gives one food for thought. It would be interesting to hear or read some past history about that company.

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