Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09

sosam117 Fri Jan 28, 2022 9:50 pm

Adapting an Enya .049 muffler to a Cox Tee Dee .09 engine

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 037_co10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 038_co10

Items needed to adapt Enya 049 muffler to Cox Tee Dee .09:

Enya .049 muffler (part number M492) normal muffler

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 039_en10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 040_en10

Dremel tool

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 012_dr10

Drill press with spindle stop and 1“ square steel block (length doesn’t matter)

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 013_sq10

Two Dremel “burr” bits (one square and one square with round end)
The square “burr” bit is 7mm (.25”) high and wide.
The other bit doesn’t mater on the length, the diameter is also 7mm (.25”)

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 010_st10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 011_sq10

From arts & craft store, a circle template.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 041_ci10

Now I have done this on some Cox Tee Dee .049 and .050 engines, and it has worked out well.
The one thing that is critical is the hole on the underneath side of the muffler that will grip the outer diameter of the cylinder. If the hole is too larger then you’ll have a muffler that will leak and will rotate and that is not what “we” want. It is best to have the underneath side hole of the silencer a little undersize and carefully make it fit the cylinder to where it is a tight fit.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 008_un10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 009_un10

I’m getting ahead of myself. Just remember what was above when it come to the underneath hole on the silencer.

Now 1st thing.
Using the circle template use the 9/16” circle and draw the circle on the top side of the silencer. The top side of The Enya silencer will be the smaller of the two holes. The one side of the 9/16” circle should line up to the front side of the silencer. There is just enough clearance on the front of the hole to clear the Cox engines fins.
Make sure the circle is on the center line of the silencer where it comes apart! The circle template should have line on it on the circles for the correct locations to line it up.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 004_a_10

Now carefully, using the Dremel tool with the rounded end bit, remove the aluminum to where you remove the black line. Removing to the black line should give us enough clearance to go around the cylinder head.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 005_a_10

Next is to do the same on the larger hole on the silencer, the underneath side of the silencer.
Remember the paragraph before? We want to have this hole undersized!
So, using the ¾” hole on the circle template do the same as you did on the upper hole for marking the larger hole position.
Now carefully, using the Dremel tool with the rounded end bit, remove the aluminum to where you leave the black line and maybe a little more. We want to leave extra material on this hole to carefully make a good seal and a tight fit!

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 001_a_10

Bottom hole material removed ---- but the hole is undersized

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 003_a_10

Moving on,
The top surface of the silencer has to be thinned down so that it can slip between the fins for positioning.
The silencer top surface is currently thinned down to 1.4mm.
We need to get it down to 1.0mm to fit into the Cox cylinder head. This is where we use the square burring bit.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 011_sq11

Setting up the drill press to where it is 1mm off the 1” square block I have, I removed the aluminum to a height of 1.0mm and I used the shaft of the bit as my gage for a depth stop and carefully moved the top muffler (both side – left and right) and removed the aluminum. You have to be really careful at the ends of the muffler.
I also had the drill press at the lowest speed (about 550RPM).

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 011_a_10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 014_st10

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 015_st10

After that was completed was the trial fit of the silencer to the Cox Tee Dee .09 engine.
The silencer almost fit up perfectly but was not quite coming all the way together.
Now remember, I had the underneath hole on the silencer a little undersized so that I could get a nice seal on the Cox cylinder and where the silencer also will tighten down on the cylinder as well.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 007_up10

This is the critical part.
With the cylinder off the engine, carefully file the lower hole to where you get a good tight fit when the silencer is screwed together. Take your time getting this done.
If done correctly, the fit is perfect to the cylinder and when the silencer screw is tightened up, the silencer clamps down on the cylinder and doesn’t move.

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 008_un11

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 009_un11

Now you have a well fitted silencer to you Cox Tee Dee .09

davidll1984 Fri Jan 28, 2022 10:31 pm

Cool that's a good idea simple modification and efective and if i was To use this trick I believe that I will open the two ends of the muffler to connect two pipes It would be a good setup in a cowls compartment. Thumbs Up

sosam117 Fri Jan 28, 2022 11:06 pm

davidll1984 wrote:Cool that's a good idea simple modification and efective and if i was To use this trick I believe that I will open the two ends of the muffler to connect two pipes It would be a good setup in a cowls compartment.

One end is for the exhaust and the other end (with the screw in it) is used for pressure.

davidll1984 Fri Jan 28, 2022 11:43 pm

Yes I know but you know that I like to experiment with the different systems I believe that there are different possibilities To try with this piece Although I don't know if the system itself reduces or changes the performance very much. But I tink its a cool stuf To explorer

Coxfledgling Sat Jan 29, 2022 3:28 am

Wonderfull bit of work, an inspiration for people wishing to RC and silence td09's.

Don't have a milling machine but that jam jar is filling bit by bit. Maybe a proxon one is affordable, will check them out.

sosam117 Sat Jan 29, 2022 7:07 am

Coxfledgling wrote:Wonderfull bit of work, an inspiration for people wishing to RC and silence td09's.

Don't have a milling machine but that jam jar is filling bit by bit. Maybe a proxon one is affordable, will check them out.

I did not use a milling machine on this project.
Just used my trusty old drill press with a depth stop on the spindle and removed the aluminum from the inside face freehand.

sosam117 Sat Jan 29, 2022 7:50 am

I think I have my new engine for the Cox Engine of the Month?

A Cox Tee Dee .09 mated with an Enya .09 carburetor and Enya .049 Silencer

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 037_co11

Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09 038_co11

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Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09

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Re: Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09

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Re: Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09

Re: Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09

Re: Adapting an Enya .049 or .06/.08 silencer to a Cox Tee Dee .09