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GallopingGhostlr · 09:07 PM

I had problems with a Tatone EM-4 09-19 Calumet muffler. The Enya .19-VI TV ran very hot with it, it was very restrictive. Well, I turned lemons into lemonade. Trimming the inner baffles did not help, so I turned it into a tongue muffler. Now I have a light weight muffler for the Testors McCoy .19 Red Head.

It works, but I don't have a DB meter, so I can't quantify effectiveness. IOW, you are on your own, YMMV.

Jim Thomerson · Jan 27, 2013, 08:01 PM

Designed an airplane for the K&B 4011. I did not leave enough space between the end of the muffler and the wing. I measured the area of the muffler outlet. I drilled enough 3/32 holes in the muffler to give me about 10% more area than the original outlet. I cut off the original outlet and plugged the hole. It worked fine.

GallopingGhostlr · Jan 30, 2013, 06:23 AM

In this case the muffler has a very small expansion chamber, almost next to none. One doesn't get the adiabatic expansion with each exhaust puff of the engine that would happen with a standard muffler. I ended up doubling the 1/4 inch (6 mm) diameter exit. Since I will be using it on a 33 in. (838 mm) wingspan Midwest P-40 Warhawk profile, it will spend its time 4-2 cycling at a slightly lower RPM. I'll know more when I fly, but it should be acceptable.

Jan 26, 2013, 09:02 PM	#1
GallopingGhostlr Vintage Aircraft Lover United States, NM, Clovis Joined Jan 2013 210 Posts	Tatone Calumet Converted to Tongue Muffler. I had problems with a Tatone EM-4 09-19 Calumet muffler. The Enya .19-VI TV ran very hot with it, it was very restrictive. Well, I turned lemons into lemonade. Trimming the inner baffles did not help, so I turned it into a tongue muffler. Now I have a light weight muffler for the Testors McCoy .19 Red Head. It works, but I don't have a DB meter, so I can't quantify effectiveness. IOW, you are on your own, YMMV. Images View all Images in thread Views: 20 Enya .19-VI TV ran hot with this Tatone EM-4 Calumet Muffler. Views: 25 Calumet opened up. See the tiny expansion chamber with restrictive baffles & exhaust opening, contributing to overheating. This muffler seems best suited to the smaller .09 - .10 sized motors if suited at all. Views: 26 Muffler with baffles ground off to the extent practical. It still ran hot on the Enya .19-VI TV. Cap shown was used in the next step .... Views: 25 Final conversion on a Testors McCoy .19 Red Head, Calumet is now a tongue muffler with copper cap and 7/64th inch dia. holes drilled. Pressure tap provides a cylinder priming port.
	Last edited by GallopingGhostlr; Jan 26, 2013 at 09:07 PM. Reason: Clarify copper cap by expanding note in 3rd picture.

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Jan 27, 2013, 08:01 PM	#2
Jim Thomerson Registered User Joined Jan 2008 1,003 Posts	Designed an airplane for the K&B 4011. I did not leave enough space between the end of the muffler and the wing. I measured the area of the muffler outlet. I drilled enough 3/32 holes in the muffler to give me about 10% more area than the original outlet. I cut off the original outlet and plugged the hole. It worked fine.

Jan 30, 2013, 06:23 AM	#3
GallopingGhostlr Vintage Aircraft Lover United States, NM, Clovis Joined Jan 2013 210 Posts	In this case the muffler has a very small expansion chamber, almost next to none. One doesn't get the adiabatic expansion with each exhaust puff of the engine that would happen with a standard muffler. I ended up doubling the 1/4 inch (6 mm) diameter exit. Since I will be using it on a 33 in. (838 mm) wingspan Midwest P-40 Warhawk profile, it will spend its time 4-2 cycling at a slightly lower RPM. I'll know more when I fly, but it should be acceptable.