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Cox Tee Dee to Medallion conversion Cox_ba12





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Post  Aeromister Sun Apr 17, 2022 8:45 am

I picked up a bunch of .051 Tee Dee parts that I would like to use to build a good running engine. I have always found the Tee Dee's to be tempermental. I have read that the Medallions were easier to start and while they didn't have the power of a Tee Dee, they were good sport engines. Is it possible to convert a .051 Tee Dee with the #5 cylinder to a Medallion engine by changing the crankshaft or do you have to change the cylinder also? Also, does anyone know where I can find a Medallion crankshaft?

Thanks
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Post  Ken Cook Sun Apr 17, 2022 9:51 am

You already aware of most of the differences. Theoretically, no your not going to make a Tee Dee a Medallion. However, you can detune the TD and make it more like the Medallion. Even using your #5 cylinder, you add head gaskets 5-6 of them. Switch the high comp head to a stock 325 head. You could also choke down the venturi. Seeing that the venturi of the TD is bell mouthed, I have put bushings which have a small I.D. that slip into the venturi but not into enough to block the peripheral jets. I then encapsulate the bushing with surgical tubing stretched over the outside of the venturi. Now, you could also switch the TD carb body to a Medallion carb body which will assist in fuel draw but will require more parts that are becoming difficult to source. In addition, dropping the nitro can also detune the engine.

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Post  Aeromister Sun Apr 17, 2022 11:31 am

Thanks for the advice. I have always like the Tee Dee, I just wish they were a little more user friendly. I will try the mods.
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Post  crankbndr Mon Apr 18, 2022 6:53 am

You don't need to change cylinders or crank to try this out. Swap the TD intake for the Medallion and try it.
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Post  Aeromister Mon Apr 18, 2022 1:38 pm

Thanks for the idea,

I thought about using a Medallion intake but the Medallion intakes are pretty rare these days (as are the cranks). I have a bunch of different cylinders with matched pistons as well as heads. I need to a few small parts and then I think I will try a few different combinations to see if I can get a winning setup. I am planning on scratch building a S-Tee so I don't really need a lot of performance. I just don't want to fight that hand launch hesitation that I have had with Tee Dee's in the past.


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Post  crankbndr Mon Apr 18, 2022 3:01 pm

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Post  Aeromister Mon Apr 18, 2022 4:19 pm

Thanks! I will give it a try.
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Post  crankbndr Mon Apr 18, 2022 7:21 pm

My own Medallion/TD project. It has a TD .15 Mark III cylinder, piston and crank. The rest is Medallion. I put it together for a pusher tether car project that is stalled. Haven't got to run it yet.

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