Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


a cheap sport muffler  - Page 4 Cox_ba12




a cheap sport muffler  - Page 4 Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» The Q-Tee Gets Ready for Another Set of Flights
by Yabby Today at 5:09 am

» ebay Beechcraft Staggerwing project arrives today
by GallopingGhostler Today at 1:24 am

» 50 weight cadtor
by 944_Jim Yesterday at 4:46 pm

» Mecoa Cox pt19
by Coxfledgling Yesterday at 3:12 am

» Remember the Micro Stick from about 10 years ago?
by dondaniels59 Sun Feb 25, 2024 7:30 pm

» Super Bee 049
by Oldenginerod Sun Feb 25, 2024 4:02 pm

» A song by Roddie
by HalfaDave Sun Feb 25, 2024 10:33 am

» Flying lines and length
by Ken Cook Sun Feb 25, 2024 8:07 am

» A couple more new to me.
by roddie Sat Feb 24, 2024 5:12 pm

» High compression head
by roddie Sat Feb 24, 2024 4:34 pm

» Like potato chips, you can't stop at just one.......or a dozen or two.
by Coxfledgling Sat Feb 24, 2024 3:27 pm

» Testers Sprite engine swap
by Greenman38633 Sat Feb 24, 2024 1:42 pm

Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

More info on this engine!




PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


a cheap sport muffler  - Page 4 Empty
Live on Patrol


a cheap sport muffler

Page 4 of 4 Previous  1, 2, 3, 4

Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Sat Dec 16, 2023 3:03 am

There's a knack to drilling-out the primer-end of the shell-casing. I haven't made a lot of these. It seems that the jaws of a small locking-plier set work best for gripping the casing for drilling-out the primer-end. I used a drill-press, a backing-block and light oil applied inside the casing. I found that the oil is necessary for getting the job done.

a cheap sport muffler  - Page 4 Casing10

again.. to completely drill-out a .22 cal. ammo casing requires a #5 (.205" dia.) drill. A 13/64" (.2031" dia.) is the next closest fractional-size drill for achieving "full-flow" through the casing (pipe).
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Sat Dec 16, 2023 3:11 am

1/2A Nut wrote:Spotted this vintage solution,

a cheap sport muffler  - Page 4 S-lhg110

a cheap sport muffler  - Page 4 S-l1gf10


Small Cox Logo Santa Christmas Tree Lighting The Tree Rudolph

That's really interesting Brad. I'd like more information about that concept.. if you can find any more.
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  Ken Cook Sat Dec 16, 2023 3:49 pm

I have quite a few of those rubber tube mufflers. Bob Davis from Davis Diesel offered them at one time.
Ken Cook
Ken Cook
Top Poster
Top Poster

Posts : 5386
Join date : 2012-03-27
Location : pennsylvania

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  Levent Suberk Sun Dec 17, 2023 1:46 pm

It also available for .020 engines at the time.

I think that it can be made and used with Cox TD .010 engines to change exhaust direction and to protect plastic fuel tank. Possibly made from silicone tubing.

a cheap sport muffler  - Page 4 Scree170
avatar
Levent Suberk
Diamond Member
Diamond Member

Posts : 2191
Join date : 2017-12-24
Location : Türkiye

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  Levent Suberk Sun Dec 17, 2023 2:08 pm

I have been making one from heat shrink tubing for .010 engine to deflect exhaust to 90 degrees. First I shrunk tubing then cut holes for cylinder. A little larger diameter tubing is suitable for this.

a cheap sport muffler  - Page 4 Images18
avatar
Levent Suberk
Diamond Member
Diamond Member

Posts : 2191
Join date : 2017-12-24
Location : Türkiye

Back to top Go down

a cheap sport muffler  - Page 4 Empty steel-wool pipe-packing

Post  roddie Sat Dec 30, 2023 8:29 pm

Just a little messin' around.. before the year ends. XXXX steel-wool packing for the pipe(s)... that won't "blow-out" under pressure. I'm hoping to "soften" the shrill tone of the exhaust-note.. while also being able to re-direct the engine's exhaust-oil mist/spray.

parts breakdown;

a cheap sport muffler  - Page 4 20231236

assembled pipe;

a cheap sport muffler  - Page 4 20231237

Shown installed in housing.. along with an assembled muffler;

a cheap sport muffler  - Page 4 20231235

I have X3 coarser grades of steel-wool that I can also try. The super-fine (XXXX) might load-up with exhaust-oil causing a restriction of flow.. but we'll just have to test it to find out.
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  balogh Sun Dec 31, 2023 2:02 am

Great solution, Roddie. I think you can spare the safety spin if you slightly mushroom the steel wool packing at its end inside the muffler so that the flue gases cannot spit it out from the cartridge shell? Or stick a short pin - longer than the shell internal diameter - into the same packing end radially to lock it inside?
balogh
balogh
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 4691
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Sun Dec 31, 2023 10:03 pm

balogh wrote:Great solution, Roddie. I think you can spare the safety spin if you slightly mushroom the steel wool packing at its end inside the muffler so that the flue gases cannot spit it out from the cartridge shell? Or stick a short pin - longer than the shell internal diameter -  into the same packing end radially to lock it inside?

Hi Andras, Yea.. the safety-pin is a bit ungainly but it's not going to loosen/fall-out from vibration. I don't want to risk having something come loose "inside" the housing that could find its way into an exhaust-port. The silicone tubing has a .187" ID which fits TIGHT over the .228" shell-casing's OD.. so it's not going to loosen/fall-off either.

More testing is needed overall.. but I like it when I think-up new things to try, without deviating too much from my original design. It might provide an option for a different application.

The "tubing" for instance when installed on a pipe; prevents the pipe from sliding backward. A short "slice" stretched-over an installed-pipe from the "outside".. will make installation of the muffler easier.. because there's nothing on the inside of the chamber..  to get hung-up.

Just to recap; my muffler slides-on (like a rubber-boot) over the glowhead and cylinder.. without the need for engine disassembly. An exhaust-prime can be done, the engine started and tuned prior to installing the muffler.. which I feel is a major advantage and there is absolutely no metal-to-metal contact between the muffler and the engine when installed correctly. An incorrect installation is unlikely.. due to the design.

A marine application could benefit from a longer length of tubing routed astern; to a pipe running through a model boat's transom.. which would greatly decrease the amount of exhaust-oil getting into the bilge.. PLUS; make for a scale-acting exhaust.

An "oil-sump" is another design-option that was discussed and tested recently.. which collects some of the oil into a wadding-media within a vented sump.

The "silencing" ability of this design is limited by the rubber (body) component. It's not going to suppress SPL's as much as a conventional (alum. canister) model-engine muffler will.

The silicone rubber is highly resistant to heat (up to 450F).. which makes it an attractive option. I've sourced three different thickness sheets to test. Thinnest is .031" followed by .045" and thickest .078".

The .031" sheet tore at the punched-hole, when attempting to insert the inner-chamber component. I will revisit that stock though.. and try something different.

The .078" sheet was too thick for my paper-stapling method when doubled-up. It is also heavier than the design requires.

The .045" sheet is the preferred thickness.. and has been fab'd into a few units. I sent one to my friend Robert down in WV.. for testing.

The .045" silicone sheet has similar workability.. when compared to the original butyl sheet material that I've sourced from bicycle-tire inner-tubes in my original design from 30 years ago. This makes sense.. because that butyl sheet is also .045" avg. thickness.

The inner-part (1" dia. aluminum ring from thin-wall tubing) has been a tougher component for me to fab. thus far. Both the cutting to length.. and drilling pipe-holes.

I had a friend cut some pieces (rings) to length.. using a lathe. The tubing was too thin (wall).. which proved to be problematic for the lathe's "jaws" gripping tight-enough so as not to spin-out.. vs. distortion of the tube from the over-tightening of the jaws.

I use a plumbing-type "pipe-cutter" to cut my rings to length now. The length needs to be at least the distance between the base of the engine's cylinder.. and a bit above the top of the cylinder's exhaust-port. This assures the sealing of the exhaust-ports by the muffler-assembly.. once installed.

A pipe-hole needs to be drilled in the ring afterward. The pipe (brass casing) OD is .228" avg. and I've found that a standard-size 15/64" diameter (.2344"/5.95mm) drill works best as the finish-size for pipe-installation.. especially if pipes are swapped-out frequently; as can be the case with varied-orifice pipes. The .006" difference is just enough to make a pipe easier to install.. which needs to be done after the ring is installed into the outer rubber body. tighter tolerances proved harder to work with.

Drilling the 15/64" pipe-holes is best done in stages.. (at least three) with smaller drills. It's easier to accurately center-drill the side of a small aluminum ring.. starting with a smaller drill and finishing with the finish-size one. I used a fixture that I originally made for hard-soldering tin-plate panels for fuel-tanks.

a cheap sport muffler  - Page 4 Dsc03221

Drilling-out the "primer-end" of the header-pipe (spent .22 LR ammo. casing) has it's own set of challenges. The largest drill possible is a #5 (.205") which totally opens the casing. I've been using a small curved-jaw locking-plier set to keep the casing from "slipping" radially.. and a drop or two of cutting-oil inside the casing to help the drill.

a cheap sport muffler  - Page 4 _22_ca10

Ooo.. 57 min. til the New Year!
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  balogh Mon Jan 01, 2024 1:41 am

I love it Roddie that lots of consideraton goes into a basically 3 component item for its full functionality! Congrats again and Happy New Year to you too!.
balogh
balogh
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 4691
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Mon Jan 01, 2024 1:49 pm

balogh wrote:I love it Roddie that lots of consideraton goes into a basically  3 component item for its full functionality! Congrats again and Happy New Year to you too!.

Thanks Andras. Most people wouldn't fuss around with these things as much as I do, but I enjoy it... and it does add a new dimension to the functionality of our Cox engines.
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Mon Feb 19, 2024 7:46 pm

Hi again.. and thanks for your interest. I'm finding that the silicone (I'm using .045" sheet) tear's easily if cut in an area of tension. Attempting to install the inner aluminum ring is best done by starting with a ring that's had its outer edges smoothed.


a cheap sport muffler  - Page 4 Al_tub11


Petroleum jelly aids in the insertion of the ring...


a cheap sport muffler  - Page 4 20240231


A bit of twisting.. will slip the ring between the silicone discs..


a cheap sport muffler  - Page 4 20240230


... then the ring can be manipulated into position.


a cheap sport muffler  - Page 4 20240232

a cheap sport muffler  - Page 4 20240233


A "pipe" can now be inserted..


a cheap sport muffler  - Page 4 20240235

a cheap sport muffler  - Page 4 20240234
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  robot797 Tue Feb 20, 2024 3:07 pm

I was thinking
what stops us from getting mufflers printed?
robot797
robot797
Platinum Member
Platinum Member

Posts : 716
Join date : 2013-07-28
Age : 33

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  balogh Wed Feb 21, 2024 12:14 am

I am not well versed in 3D printing, but the material, that should be on the one hand printable, should be heat resistant on the other. The hot flue gases restricted by any muffler from immediate mixing with fresh air will heat the muffler body to high temperature..
balogh
balogh
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 4691
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  robot797 Wed Feb 21, 2024 12:41 am

I ment metal 3d printed
It's getting cheap lately
robot797
robot797
Platinum Member
Platinum Member

Posts : 716
Join date : 2013-07-28
Age : 33

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  roddie Thu Feb 22, 2024 7:48 pm

Always good food for thought.. to discuss the latest tech.
roddie
roddie
Top Poster
Top Poster

Posts : 8090
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

a cheap sport muffler  - Page 4 Empty Re: a cheap sport muffler

Post  Sponsored content


Sponsored content


Back to top Go down

Page 4 of 4 Previous  1, 2, 3, 4

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum