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HelicopterGasser Model RC HelicoptersOther › Best running muffler for a gasser?
08-11-2010 11:35 PM  7 years agoPost 41
smallplanes

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I want to try a Zenoah factory black can muffler first. Like i said before i don't care about the noise i have hundreds of acres of my dads farm to fly on. No one will ever say a thing. I do like the looks of the rear mount but i'm scared of it.

Thanks
Ivan


Spectra G 26cc
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08-12-2010 01:12 AM  7 years agoPost 42
Mike545

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gettysburg, pa

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Ivan, thats what I run, little loud, but ...never gets loose, and or leaks, a++, price is right also

"always feel thankful..... never entitled"

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08-12-2010 01:40 AM  7 years agoPost 43
pphil611

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South Dakota

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I had the zimmerman rear mount on my 1005 and it finaly cracked, I put the original can on it. I thought it would direct the exhaust right on the skid, so I cut the elbow off the Zimmerman and attached it to the discharge of the can to exit the exhaust out the side. I see you have yours pointing down, does it get the skid hot??

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08-12-2010 02:10 AM  7 years agoPost 44
smallplanes

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I might need to put exhaust deflectors on it if thats the case. How did you see my heli?

Thanks
Ivan


Spectra G 26cc
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Bat 27cc
Trex 700<br

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08-12-2010 03:01 AM  7 years agoPost 45
pphil611

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South Dakota

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Probably someone else had a picture of the can, thought it was yours.

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08-12-2010 03:37 AM  7 years agoPost 46
Justin Stuart (RIP)

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Plano, Texas

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Ivan, you know you can buy the black stock Zenoah mufflers from Dave's Discount Motors for about $12?

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08-12-2010 04:36 AM  7 years agoPost 47
Toadster25

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Iowa

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I tried a tuned pipe=cracked header pipe after 1-2 gallons of running. Tried the V2=wouldn't run right and came loose over and over almost stripped out the engine threads. Tried the stock muffler and engine has run great ever since and has never came loose. I love the stock muffler. To make it work I cut a small wedge shape piece out of the outlet pipe on it and then bent it over and welded it back together. That way it doesn't hit the skid.

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08-12-2010 07:07 AM  7 years agoPost 48
shawmcky

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Isle of Wight,United Kingdom

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Stock muffler
Some of the airplane stock Zenoah box type exhausts have exit pipes in different places and lengths.

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08-12-2010 05:20 PM  7 years agoPost 49
smallplanes

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I just looked at my heli and the two pipe Zenoah can muffer is not pointing down but straight back. The muffler cam with the G260PU-EI motor. The second motor i bought was a G260PUH high Mod from QWW and it had no muffler. I wish it would have had the same muffler as my first motor did.

Thanks
Ivan


Spectra G 26cc
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Bat 27cc
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08-13-2010 11:20 PM  7 years agoPost 50
smallplanes

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Well after thinking about it and being broke i guess were going to try and make that $230 tuned muffler work. Can anyone tell me how to tune the muffler? What i mean is how do i know if i need to cut some off the stainless pipe or slide the teflon coupling apart? I know someone out there has got a tuned pipe to work but how? The one i'm refering to is the Zimmerman two piece pipe. I have a buddy of mine doing the work i'm just asking the questions.

Thanks
Ivan

PS I know most of you will say to scrap the pipe but i want real help not insults about it.


Spectra G 26cc
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Bat 27cc
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08-14-2010 07:02 AM  7 years agoPost 51
shawmcky

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Isle of Wight,United Kingdom

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Dont cut it open
unless you have at least tried a different pipe,if it turns out it is not the cause,if it were me ,i would cry if i trashed an expensive pipe without at least substituting it for another first.

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08-14-2010 07:28 AM  7 years agoPost 52
lejon

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Las Vegas, Nevada

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SmallPlanes, I'm by no means an expert on engines or tuned pipes, however as no one is commenting I will offer my two cents that I remember from the days of running a tuned pipe on my scarab well-craft with a pico 90. I believe that the general process is the same. Also I believe the primary difference between a tuned pipe and a tuned muffler is that the muffler will decrease( muffle the noise and have a peak power band based on volume while a pipe could care less about the noise and goes for ideal volume for max power. Also to all of the experts out there I will use the term pipe interchangeably even if technically I shouldn't. I believe that for our engines the challenge will increase the complexity whether it is a tuned pipe or muffler. Also if I have miss stated or gone astray please chime in and set the record straight as I would like to learn and correct my misunderstandings.

I believe that when others tell you that a tuned pipe on a Heli is nothing short of a nightmare, it is because the tuned pipe has a very small (short in terms of rpms) sweet spot. Once the engine is in that range the motor will create an optimized condition giving increased power because it will have the ideal back-pressure. The problem with a heli is that once you hit that very small rpm range it is hard if not impossible to stay in that range. As you fly the load will change rpm's will not stay within the power band. This will cause the engine to go on and come off the pipe. Since there is a delay in this process you will not have a smooth running engine will only experience peaks in power.

If you still want to experiment consider the following:

1. Your adjustments to the pipe are changing the volume which changes the back-pressure and will determine when the engine comes on the pipe.
2. Short of having to weld and make serious modifications you can't lengthen the pipe beyond the silicone tube connectors length.
3. Start with the recommended length (manufacturer will typically give a length that is a good starting point for the specified engine.
4. Set this up and note and keep track of the gap between the header and the pipe and try and chart when it comes up on the pipe and when it comes off.
5. First lengthen then shorten the gap and run the engine each time you make a change to determine when it comes on the pipe. (the biggest problem here is that to get up to rpm you need to fly the heli and can not always tell if and when it goes on the pipe)
6. If you find that it runs better longer but you have no more silicone tube to extend then consider a longer piece of tube (often times when there is too much tube it will burn more easily and faster).
7. If you find it running better as it gets shorter then you will have to consider cutting the header or the pipe. (Be extremely careful here because it is tough to put back cut material on the pipe or header).

The only way I think a pipe would work is if you had a transmission and gear box. This would allow you to run the engine at a constant rpm and would use the transmission to change gears as needed to keep the demand on the engine constant.

Lejon

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08-14-2010 09:58 AM  7 years agoPost 53
carbonhead

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Gwent

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Sorry, no hard feelings, only trying to help

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08-14-2010 05:20 PM  7 years agoPost 54
smallplanes

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Thanks carbonhead for the offer,but i can't take money from anyone i would not feel right. I can afford the $12 muffler but the guy tunning my motor wants very badly to get the two piece tuned pipe to work. He is helping me so i can not and will not tell him what to do i'm just ask the questions on here for him to read and get ideas. This has been and on going project so i'm not in no hurry to get it going,i have about 7 or 8 more helis to fly. I let him keep my 12 FGH TX to do all the setup and tuning and i fly the rest of my helis on my 12ZH tx that i have. Thanks for all the tips and i hope he can get some good use out of them. I have heard that when you get a tuned pipe right that you almost don't even need a gov as the pipe will act like a gov. I don't know this i've just heard it. I do have a GV1 and a Stator Gator sitting here to go on it and a Gen.

Thanks to all and a special thanks to Carbonhead
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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08-14-2010 07:01 PM  7 years agoPost 55
smallplanes

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https://rc.runryder.com/helicopter/...68/100_1779.jpg
https://rc.runryder.com/helicopter/...68/100_1780.jpg
This is the pipe i'm try to tune.

Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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08-16-2010 02:22 AM  7 years agoPost 56
JuanRodriguez

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The Villages, Florida

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Ivan,
PM Sent !

Been there, done that and old enough to know better.....

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08-17-2010 08:05 PM  7 years agoPost 57
smallplanes

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Ain't been dare,ain't done dat and not old enuff to know better.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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08-26-2010 11:59 PM  7 years agoPost 58
smallplanes

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Well motor smoothed out then a air leak back to square one.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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08-27-2010 12:45 AM  7 years agoPost 59
Justin Stuart (RIP)

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Plano, Texas

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Ivan, that doesn't look like a tuned pipe to me. That is just a Zimmerman muffler. A tuned pipe really needs to have cones at either end, or else it is impossible to tune. I wouldn't be surprised if that muffler in your picture has baffles through the center which would cancel out any resonance you might get inside.

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08-27-2010 02:46 AM  7 years agoPost 60
dre4473

rrApprentice

Clarksburg WVa

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Pipe!!
That pipe is the zimmerman muffler..Irwin at QWW carries them..You might PM him smallplanes and get some advice from him on it..I dont think you can tune that one..It has baffles in side of it, which makes it a muffler..tuned pipe has a chamber and coned ends on it so the exhaust hits in the right place as you lengthen it or shorten it..Thats called getting on the pipe as stated before..Hope this helps you..

Donald R. Edwards JR Fly it like you stole it!!!

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