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Cox Engine of The Month
September-2020
sosam117's

"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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Cox Mufflers with Snout, GONE?

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Thinking Cox Mufflers with Snout, GONE?

Post  happydad on Thu Sep 03, 2020 11:30 pm

Well, here I am again tinkering again. Thanks to to another FORUM member I am the proud owner of a Cox Muffler with a Snout, you know, the thing that sticks out to the right, or left and directs the smoke, gas, and CRUD away from the engine and mostly the plane. Why did Cox do away with the Concept, or was it too expensive to add a small tube to the side of the main muffler.

    So I decided to see if I could do this myself.  Where I used to work 20 years ago we made HF, 2 to 30MHz, broadband Radio Equipment for 3rd world countries and I had used a brass tube similar to that on the snout of the old Cox Muffler. I have beed cleaning out the garage for various reasons, made $$ on 2 different OLD video games for ATARI 400, 800 Computer Systems, and I pretty much new about where the brass tubes were. I dug out a few different sizes, figured out the best one and sat down in a hot garage and came up with this, first the part.

Cox Mufflers with Snout, GONE?  Img_1910
brass tube


Cox Mufflers with Snout, GONE?  Img_1911
top side view 1


Cox Mufflers with Snout, GONE?  Img_1912
bottom side view 1


Cox Mufflers with Snout, GONE?  Img_1915
top side view 2

the outside diameter of the brass tube  is about 1/4inch, so it is a little larger than the original Cox Muffler. I am trying to flatten the brass against the aluminum muffler, then use a hard epoxy to hold the tube against the muffler and seal it so no gasses leak and back up inside the muffler.

So what do you guys think of my idea?  I have several of the brass tubes if you are interested and the manufactures part number and address.

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Thinking Re: Cox Mufflers with Snout, GONE?

Post  Cribbs74 on Fri Sep 04, 2020 5:44 am

The discharge tube is actually a later addition. The original 1960’s QZ’s had no tube... so you probably have an early version that are kinda hard to find.

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Thinking Re: Cox Mufflers with Snout, GONE?

Post  getback on Fri Sep 04, 2020 5:52 am

I don't think the epoxy will hold , can u solder it ? Small Cox Logo
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Thinking Not to Aluminum.

Post  happydad on Fri Sep 04, 2020 5:59 am

getback wrote:I don't think the epoxy will hold , can u solder it ? Small Cox Logo

getback: not to aluminum, very easily. Maybe with a spot welder, a small one. I will try the epoxy for now. They used to make an epoxy with little particles of metal or silver in it. Can’t remember what it was called. When I was in Japan some of the slot car guys used to use it on the motor armatures to cool them better.

Those were the days. Young and stupid, and all alone in Japan.

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Thinking Re: Cox Mufflers with Snout, GONE?

Post  sosam117 on Fri Sep 04, 2020 7:27 am

happydad wrote:
getback wrote:I don't think the epoxy will hold , can u solder it ? Small Cox Logo

getback: not to aluminum, very easily. Maybe with a spot welder, a small one. I will try the epoxy for now. They used to make an epoxy with little particles of metal or silver in it. Can’t remember what it was called. When I was in Japan some of the slot car guys used to use it on the motor armatures to cool them better.

Those were the days. Young and stupid, and all alone in Japan.

Happydad      Jeep                         Old Bugger United States

Happydad,
Try using JB Weld.
I have used it on some old Aurora Mills engine crank cases. and on an O.S. carburetor and has held up for a few years.
Usually got the JB Weld at an auto parts store.

Here is my version of an extension:
I used a small section of copper tubing ( left over from tubing for the ice maker).
Using a 5mm tap and die, I made some threads on the copper tubing and tapped the Cox muffler section.
After threading the parts together, I used a small amount of JB Weld on the threads inside the muffler ring.
Cox Mufflers with Snout, GONE?  Img_0017
Cox Mufflers with Snout, GONE?  Img_0019
Cox Mufflers with Snout, GONE?  Img_0018
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  getback on Fri Sep 04, 2020 7:40 am

Thats cool , is the lip inside the muffler housing already there for tapping or did you make that also ? Huh...
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  aspeed on Fri Sep 04, 2020 9:31 am

I think that is just a nut inside. Too bad a big pop rivet gun will not fit inside the muffler. It almost looks like the 3/16" rivet would work, and then the flare would hold it in. Some of those are aluminum too. I made something like that for a different motor that needed to have a larger hole. AP .15. Just threaded both the muffler and the insert. It stayed on so far. The pressure tap has unscrewed though. Another way to get the goop away is to just punch a hole in some silicone tubing and push the cylinder through it. Ace used to sell those.Cox Mufflers with Snout, GONE?  Ap_09_13
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  Cribbs74 on Fri Sep 04, 2020 9:48 am

At second glance I have no idea what you have there. There are no cutouts whatsoever in that muffler.
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  sosam117 on Fri Sep 04, 2020 12:57 pm

getback wrote:Thats cool , is the lip inside the muffler housing already there for tapping or did you make that also ? Huh...

There is no lip inside the muffler housing. I just drilled out the hole for the 5mm tap and tapped the hole.
The wall of the muffler housing is thin, that is why I used a metric tap (more threads per mm (inch).
What looks like a lip is the JB weld (epoxy) and a "C" clip clipped onto the threads ( it looks like a nut).
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  Oldenginerod on Fri Sep 04, 2020 6:09 pm

This type of muffler with the plastic upper plate doesn't need an outlet as the upper plate flexes under exhaust pressure allowing exhaust gasses to escape. The ones with the spring clip around them are designed to lessen the restriction by opening up the exhaust when quietness is not required, and also allows the engine to be primed.
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Thinking added pictures

Post  happydad on Sun Sep 06, 2020 3:27 am

Oldenginerod wrote:This type of muffler with the plastic upper plate doesn't need an outlet as the upper plate flexes under exhaust pressure allowing exhaust gasses to escape.  The ones with the spring clip around them are designed to lessen the restriction by opening up the exhaust when quietness is not required, and also allows the engine to be primed.


I tried the JB Instant Weld last night, Saturday, but it wasn’t completely hardened, I will take some pics and post later tomorrow.
>>>>edited 9-6-2020 at 3:45p.m. PST.


Cox Mufflers with Snout, GONE?  Img_2010
view 1


Cox Mufflers with Snout, GONE?  Img_2012
view 2

I still need to clean up and add more JB.  Tomorrow.
>>>>>>>edit completed

Record setting temperature today at 113 for my town. It was still 93F when wife went to bed hours ago. It is still 85F outside at 1:25a.m. PST.

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Last edited by happydad on Sun Sep 06, 2020 5:59 pm; edited 1 time in total (Reason for editing : to add pictures)
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  sosam117 on Sun Sep 06, 2020 8:40 am

happydad wrote:
Oldenginerod wrote:This type of muffler with the plastic upper plate doesn't need an outlet as the upper plate flexes under exhaust pressure allowing exhaust gasses to escape.  The ones with the spring clip around them are designed to lessen the restriction by opening up the exhaust when quietness is not required, and also allows the engine to be primed.


I tried the JB Instant Weld last night, Saturday, but it wasn’t completely hardened, I will take some pics and post later tomorrow.

Record setting temperature today at 113 for my town. It was still 93F when wife went to bed hours ago. It is still 85F outside at 1:25a.m. PST.

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Happdad,
It usually takes at least 24 hours for the JB Weld to harden up.
It may take longer with the high heat and humidity?

By the way, The muffler I have does not have a "plastic" upper plate.
It is spring steel and it seals tightly around the cylinder and only flexes downward to make a good and tight seal when the cylinder is screwed to the crank case..
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Thinking Re: Cox Mufflers with Snout, GONE?

Post  Mike1484 on Sun Sep 06, 2020 11:52 am

How about a spent .22 shell and some high temperature silicon RTV ?

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Thinking Re: Cox Mufflers with Snout, GONE?

Post  fredvon4 on Sun Sep 06, 2020 1:12 pm

J-B Weld™ is The Original Cold Weld two-part epoxy system that provides strong, lasting repairs to metal and multiple surfaces. Mixed at a ratio of 1:1, it forms a permanent bond and can be shaped, tapped, filed, sanded and drilled after curing. At room temperature, J-B Weld™ sets in 4-6 hours to a dark grey color. A full cure is reached in 15-24 hours. J-B Weld™ has a tensile strength of 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured.
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Thinking Re: Cox Mufflers with Snout, GONE?

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