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Post  Tee Bee Fri Apr 12, 2019 12:56 pm

That's a TD .15 MKII Special, as indicated by the single-side exhaust port and gold case. The TD .15 Special(sometimes referred to as a TD .15 MKI Special) is different. It looks mostly like the original TD .15 with the exception of the wristpin piston connection instead of the ball/socket which came on the original. There were incremental improvements made between each version. Nice score!
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Post  Scotty68 Sun Jun 23, 2019 12:15 am

Jobe_Pro wrote:One Cox Tee Dee Mark II Special .15 Model just went on Ebay April 8th. for $346.69

.15 Cox Special - Page 2 Cox_te14

Nice looking Engine

My oh my isn't that purdy!
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Post  1/2A Nut Sun Jun 23, 2019 1:58 am

Tico you have a Medallion crank shaft for whatever reason.
It is possible the previous owner wanted to reduce fuel draw
at the expense of a bit of power.

You would have to post a pic and expose the piston which maybe a
Medallion piston. It could have it's roots tied to a Medallion that was
upgraded. It is possible the engine was built from MK II parts. There
was a time replacement parts could be bought.


.15 Cox Special - Page 2 The_te11
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Post  ticomareado Sun Jun 23, 2019 8:42 pm

Thanks for info Nut. So do all Tee Dee .15 versions use identical crankshafts?
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Post  1/2A Nut Sun Jun 23, 2019 9:11 pm

Yes I believe so, I have two 2nd gen TD .15's and the MK II
I upgraded them with aluminum carb bodies and all three have
square windows on the cranks.

Also have 2 medallions one was upgraded with a aluminum carb body
and TD NV assembly both had round windows on the cranks.
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Post  ticomareado Mon Jun 24, 2019 5:43 am

Have you cross checked any for intake timing?
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Post  1/2A Nut Mon Jun 24, 2019 10:40 am

No not yet,
I would like to use a good sealing / breathing header manifold on one.
If that happens I will put a timing wheel on expect 140- 145 exhaust timing.
Thus far ran 3 out of the 5 thus far they are beasts compared to the .09's

If you wish you can compare yours with a APC 7x5 to the following results. Ran as shown.
APC 7x5 /18,330 rpm / 37oz - 2.33 lbs thrust / .532 hp - 397w  / 87mph prop pitch speed.
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