TeeDee vs Medallion

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

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

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?

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

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......

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.

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

Indra:



Check the one on Bernie's site.




See details

Cox .049 Tee Dee Glow Head
SKU: 490GHTD

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

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.

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

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

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.

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

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.

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.

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

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