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Post  Cribbs74 Sat Jan 16, 2021 11:43 pm

I have a couple Tarno carbs that have been lying dormant for a while and I now have an excuse to use one for this Jerobee build. I was reading the instructions and it says that I should use a muffler for best performance. I was wondering if I can get away without one, because I don’t want to kill the performance with the TD. If it’s a must can I get away with an exhaust collector?

Ron
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Post  balogh Sun Jan 17, 2021 1:56 am

I suppose the use of muffler is recommended in order to prevent flame-out when idling, by way of retaining the heat in and around the cylinder. I use Tarno carbs and with a hot turbo plug in a Galbreath or Kamtechnik head the idle can still be stable even if not so low as with a muffler.
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Post  OVERLORD Sun Jan 17, 2021 8:55 am

An RCU thread about the Tarno Carb and instructions. It has some comments of users.

https://www.rcuniverse.com/forum/1-2-1-8-airplanes-70/8359997-tarno-carburetor-instructions-setup.html

A few comments:

"Look closely at Paragraph 3 on the Tarno 1/2A Carb factory instructions and you'll see that they highly recommend adding a Cox muffler that is "essential for reliable idling and noise reduction".
This also appears on the Tarno.09 Carb instructions.
This leads me to believe that the Tarno carb design needed additional exhaust back pressure to create a consistant Air/Fuel ratio for a smooth transition from idle to WOT rpms.
It probably worked best with cylinders that had little or none Sub Port Industion.
I have not had time to try out a with and without muffler test yet but hope to shortly.
Lack of muffler back pressure or low back pressure from a Cox/Ace Throttle ring is probably the reason that 50% of the opinions of the Tarno Carb say it's junk and the other 50% who installed it a muffler said it was great."


"The Cox muffler is a power robbing POS. The Cox muffler by itself brings you down to 3/4 throttle. What is needed is a muffler with an expansion chamber. Finding a strong running non SPI P/L set might be a tall order. After satisfying these first 2 conditions, any decently made throttle valve should do the job nicely."


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Post  Cribbs74 Sun Jan 17, 2021 5:46 pm

Thanks guys,

Looks like I have some bench running to do. I’ll try multiple configurations and tach each for best performance. I’ll choose the highest rpm with the best idle.

Ron
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Post  dckrsn Sun Jan 17, 2021 8:12 pm

Cribbs74 wrote:Thanks guys,

Looks like I have some bench running to do. I’ll try multiple configurations and tach each for best performance. I’ll choose the highest rpm with the best idle.
Ron

Hey, Ron. If you want to throw in another variable, there's the Cox throttle muffler. Also used on the Medallion .049 RC.
Tarno carb operation  Dragon10
With some clever linkage, this might work. Since there's no exhaust port on this one, tweaking the muffler spring may help
maintain  some combustion chamber heat(low idle). Huh...  
If you want to pursue this, I'll send you one. I have a Tarno TD carb, but I'm lazy of late.
Bob
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Post  Cribbs74 Sun Jan 17, 2021 9:17 pm

Thanks Bob,

You are too generous. Let me see with what I can do with what I have on hand first. I may have the right combo.
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Post  davidll1984 Sun Jan 17, 2021 9:59 pm

Ils posible To presurise the tank wit fuel tube behind prop like y did wit m'y tigermoth look picTarno carb operation  16109411
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Post  dckrsn Sun Jan 17, 2021 10:35 pm

Cribbs74 wrote:Thanks Bob,
You are too generous. Let me see with what I can do with what I have on hand first. I may have the right combo.
Lots of unexplored avenues here, Ron. Glow plugs, pressurizing the tank, back pressure, cylinder height/ sub port induction, fuel
mix, etcetera, etcetera, etcetera(King and I reference) https://www.youtube.com/watch?v=1JHH6iwgIek
I might try a few defined possibilities, but the combinations are endless. There might be a magic potion, and I hope one of us comes up with it.
I'm basing my next thesis defense on it. PHD here I come!
Dr. Bob
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