TeeDee vs Medallion

WingingIt74 Sat Feb 18, 2012 3:41 pm

What's the difference? I picked up a Medallion .09 today, so I'm curious. Are parts interchangeable? Can I put a TD carb on a Medallion?

John Goddard Sat Feb 18, 2012 3:43 pm

Not unless you change the whole carb body.

**Cribbs74** Sat Feb 18, 2012 3:59 pm

The biggest difference is the crank and the carb body/ carb assembly. I also think they are non SPI and run a standard head. Not sure about all that though. Ask John G as he has a few.

The crank in the TD is milled so it has a larger rotary valve opening wheras the medallion has a smaller hole drilled into the crank.

The medallion was considered the poor man's TD but, in my opinion it is still a very good engine. I don't own any myself as I am more into TD's. The medallion .09 is a good sound Cox product and will perform well. Just not as well as the TD .09

John Goddard Sat Feb 18, 2012 4:11 pm

My 049's standard and RC have got spi.
The 15 R/C has as well.
Whether it's standard I dunno.
Smile

PS
Standard heads as well

**Cribbs74** Sat Feb 18, 2012 4:30 pm

John Goddard wrote:My 049's standard and RC have got spi.
The 15 R/C has as well.
Whether it's standard I dunno.

PS
Standard heads as well

Ok, I stand corrected on the SPI. I wonder how they would fare with a TD head?

GermanBeez Sat Feb 18, 2012 5:35 pm

always depends on the fuel. high comp doesn't immediately mean high performance,
it just shifts the ignition point of the fuel.

**Cribbs74** Sat Feb 18, 2012 5:49 pm

True, to a point.

Think of it this way, 2 TD .049 exactly identical, fuel 25% nitro. One has a TD head the other a standard. Which one runs quicker?

The variations are limitless, sure if you use 50% nitro you may be better of with a standard head.

I was just wondering what a simple head change would do.

Cox designed the TD head for a reason......

SuperDave Sat Feb 18, 2012 5:57 pm

A Cox High-Compression head as found on a TD .049 has a round serrated ring around the top. (Check the appearance on a vendor's site) They are also found on the TD .051

While the Medallion is a good engine, Cox lavished a lot more detail and expense on the TeeDee therefore the TeeDee's higher price and market value.

nitroairplane Sat Feb 18, 2012 5:59 pm

SuperDave wrote:A Cox High-Compression head as found on a TD .049 has a round serrated ring around the top. (Check the appearance on a vendor's site) The are also found on the TD .051.

Usually but not
The one Matt carries appear normal on the outside.
Indra

SuperDave Sat Feb 18, 2012 6:19 pm

Indra:

Check the one on Bernie's site. Smile

See details

Cox .049 Tee Dee Glow Head
SKU: 490GHTD

nitroairplane Sat Feb 18, 2012 6:30 pm

I know that's Bernies but the ones that Matt stocks do not have the Knurling.
Indra

**RknRusty** Sat Feb 18, 2012 7:39 pm

nitroairplane wrote:I know that's Bernies but the ones that Matt stocks do not have the Knurling.
Indra

I noticed that recently. I figured it was just his picture and if you ordered them, you'd get the real thing. But the picture is definitely a standard Bee head.

SuperDave Sun Feb 19, 2012 10:02 am

I'd submit that Matt's picture may be incorrect therefore misleading. ??????????

nitroairplane Sun Feb 19, 2012 10:07 am

Nope!
I have 2 of Matts heads they looks standard from the top.
They are MECOA production le me get some pics.
Indra

Surfer_kris Sun Feb 19, 2012 11:04 am

Apart from the differences already covered, there might be a difference in the transfer channels too. I haven't seen any markings to distinguish a Medallion cylinder from a TD cylinder, but I have one Medallion engine with just one transfer channel. While another Medallion has two transfer channels, like on the TD. Both these medallions have SPI though.

dankar04 Sun Feb 19, 2012 11:15 am

The cranks are different and transfer ports from TD/Medallion. Medallions are good sport engines as TD's were more performance made. TD head would help some. Anyway a fine decent engine.
Dan Small Cox Logo

**RknRusty** Sun Feb 19, 2012 1:26 pm

Surfer_kris wrote:Apart from the differences already covered, there might be a difference in the transfer channels too. I haven't seen any markings to distinguish a Medallion cylinder from a TD cylinder, but I have one Medallion engine with just one transfer channel. While another Medallion has two transfer channels, like on the TD. Both these medallions have SPI though.

All I know is .049s and the Medallion of the pre-slit years has a #2 stamped on the barrel and one transfer port. The Tee Dee of the same size and era has radical porting, dual bypasses with two flutes beside each port, a tapered #4 cylinder with SPI. The TD is much faster too. The Medallion is known for it's ease of operation, easy cranking and easy needling. I've never seen an .09 though.

GermanBeez Sun Feb 19, 2012 2:12 pm

yeah, for me they are both equal. it depends on what you want.
the TDs are the "black widows" while the medallions are the "babe bees" of the cox front intake engines.

Cox International Sun Feb 19, 2012 2:28 pm

The reason that Matt and I have different pics is that we are still selling the original batch of TD heads (with the knurl). Those are the heads we had assembled from the OEM bulk components we acquired from Estes/Cox; whereas we had our supplier source the filament and assemble (press) the heads. We sold some to Matt but he ran out of them.

In anticipation of us also running out of them we had new ones made last year; whereas we still used the OEM Cox components but, as we had run out of bodies, had our manufacturer make those. To keep the cost down, we omitted the knurl at the top (it has no practical purpose).

Matt and I shared in this production and that is what he is selling. When we run out of our old ones we will also sell the ones Matt has and will change the picture accordingly.

However, please rest assured that these heads (whether sold through Matt or ourselves) are identical to OEM Cox product, except for the marking on the top; meaning the ones that Matt is now selling are identical to the ones we currently are selling. Inside and outside they are genuine Tee Dee Glow Heads

To further clarify: None of these heads have anything in the least to do with MECOA and under no circumstances do we in any way wish to be seen as associated with that company.

WingingIt74 Mon Feb 20, 2012 11:10 am

I was more curious if a Medallion could be converted to a TeeDee or if I could put a TeeDee carb on a Medallion.

nitroairplane Mon Feb 20, 2012 11:16 am

Sorry Bernie I did not mean to associate you with that company.
I said I would never order from MECOA then someone who will no be named although heat wish to come forward told me that the heads from my Christmas bees ce from
MECOA so I came to accept it.
Sorry for may confusion I caused.
Indra

Cox International Mon Feb 20, 2012 11:18 am

The short answer is "yes".

You can change all the relevant parts and make a Medallion into a Tee Dee.

In direct answer to your carb question, you can buy the following parts to make a throttled Medallion:

http://coxengines.ca/product.php?productid=352&cat=26&page=1

and

http://coxengines.ca/product.php?productid=499&cat=13&page=1

WingingIt74 Mon Feb 20, 2012 11:20 am

Cox International wrote:The short answer is "yes".

You can change all the relevant parts and make a Medallion into a Tee Dee.

In direct answer to your carb question, you can buy the following parts to make a throttled Medallion:

http://coxengines.ca/product.php?productid=352&cat=26&page=1

and

http://coxengines.ca/product.php?productid=499&cat=13&page=1

Well, the one I have is an .09 Smile

I thought I mentioned it early in the post but we seemed to have shifted to 049s Smile

Cox International Mon Feb 20, 2012 11:22 am

No worries Nitro.

I bought one of Matt's Christmas Bees but did not specifically look at the head (the engine is at home) but if it has a high-compression head then the product came from us or, better said, it was from the production run that Matt an we shared.

Cox International Mon Feb 20, 2012 11:24 am

Forgot about that, sorry.

However, the same principle applies. If you can find an 09 carb body and carburetor, you can convert the engine to RC.

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