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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Are all mufflers plagued?
01-01-2014 02:32 PM  4 years agoPost 1
mustang67ford

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Central Pennsylvania

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I have been reading and trying the determine what muffler to get. I have listened to them on gaspowered thoughts which was very helpful. Here is what I have learned:

1. I liked the sound of the RJX muffler the most and the price is great. However, it does not seal, it breaks apart, and it melts apart.

2. The hatori isin't bad sounding and has an innovative mounting technique. However, it is also quite expensive. Even at the higher cost, i have read many posts where the muffler cracks. It is also debatable on the rpm being a factor per hatori. So for the price, is it really worth the trouble.

3. Next up is zimmerman. When i first started muffler shopping, they were what stood ot first. The sound however is not as great as i would have hoped. I have read where this muffler cracks as well and the manufacturer would not cover. The reports of failures seems to be less than that of the hatori though.

4. Lastly is the century pipes, just don't care for them so didn't do much research.

Not sure yet what to get. It seems like no matter what, it will be like throwing money away. Maybe i'll send the stock muffler away to be powdercoated or chromed. Righ now, i think i am leaning towards the zimmerman pipe as the sound isin't bad, no reports of leaks, and very few reports of cracking problems.

I seen a picture once of a side mounted zimmerman pipe, but had a chromed header. That was a neat setup.

Just my thougts as somebody new to gassers and walking in with an open mind.

Team HeliProz - Retired
AMA #513507
IRCHA #4011

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01-01-2014 02:47 PM  4 years agoPost 2
wrongler

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Brewerton, New York

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Just my thoughts:

The gassers are prone to vibes. It may be the problem for cracking!
I'm sure some of the gasser guy's can help you.

Bill Whittaker

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01-01-2014 03:53 PM  4 years agoPost 3
fastflyer20

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N. Tonawanda, NY

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You did your research well, there is no magic muffler void of any problems yet in the forums people post problems and not success stories.

I have 3 rjx. The original from a few years ago did not seal due to the adapter plate not being machined flat. The last two plates have been flat and seal with no issue. If they crack, they can be repaired. With the exhaust tip modified, this remains my go to muffler.

I have not run a hatori or Zimmerman.

Century v2 quality seems questionable as of late. I had an old one that was great but was wrecked in a crash. The next two leaked due to solder porosity and the tips eventually broke free, they are not repairable (we tried).

In conclusion, for the price and repairability I will stick with RJX.

While you did not ask about tuned pipes, the QD is a stamped welded assembly and has a flex coupler. They have proven to be extremely durable.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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01-01-2014 04:37 PM  4 years agoPost 4
rbort

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Franklin, MA - USA

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Mufflers
I'm using the zimmerman rear mount muffler on my 1005 with a PUH motor and the century v2 torpedo pipes on my Spectra and Whiplash with the RC motors.

Both of these mufflers have been good to me, not cracks I did mount the zimmerman on rubber isolaters I think that is better. The century works better on RC motors that puh as they are smoother and hold on better without springing leaks. The zimmerman is leak proof, it never gets loose on anything.

Hatori and RJX are the same thing, RJX is the chinese copy of the hatori. Both have the double mount plate and they are very hard to seal. RJX quality is crap it breaks in half over time. Hatori muffler quality seems to have gone down, didn't use to break before but I've seen some people break the newer ones. What I didn't like about the Hatori is that the tailpipe is too small and any carbon buildup on the walls causes loss of power.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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01-01-2014 04:39 PM  4 years agoPost 5
geomecc

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Long Island ,NY

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I wish the QD pipes were smaller. The century v5 pipe is decent the v2 pipe makes more power than the v5 but is louder.

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-01-2014 04:43 PM  4 years agoPost 6
rbort

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Franklin, MA - USA

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Agree
The v2 is the better power pipe and the v5 has small holes inside the inlet which plug up hence not a good choice anyways. Also its considerably heavier than the v2.

You can add the tip on the v2 to cut some noise down (that's what I do) and lose a little power, but still more power than the v5 and the noise is more manageable.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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01-01-2014 05:27 PM  4 years agoPost 7
BeltFedBrowning

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Kansas City

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...

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01-01-2014 05:33 PM  4 years agoPost 8
rctrooper1

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Brownsville, Texas

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I have three gassers all with century v2 torpedo pipes. Very pleased with all 3. I have replaced the gasket due to some leaking but not a big deal for me.

jz.

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01-01-2014 11:20 PM  4 years agoPost 9
geomecc

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Long Island ,NY

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when i notice my any pipes getting pluged i take them off and soak in safety kleen solvent at work then take some stiff 10 guage copper wire (multi strand) strip off the insulation about an inch open the strands a but and scrubb the inside of the pipe and that works pretty good. i could bring it to a radiator repair shop and have it boiled out.

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-01-2014 11:23 PM  4 years agoPost 10
geomecc

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Long Island ,NY

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@beltfedbrowning that looks like an older version of the v5. the v2 is the longer thiner torpedo pipe

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-01-2014 11:40 PM  4 years agoPost 11
BeltFedBrowning

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Kansas City

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...

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01-02-2014 12:52 AM  4 years agoPost 12
turboomni

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East of the Equator

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I am on my 2nd RJX muffler. First one split and had it welded and finished 2 flying seasons. Bought a second and so far so good. First one leaked abit and by mistake used permatex ultra black hi temp rtv. I do not recommend this. On my second RJX a mechanic friend says use the red ultra high temp rtv. No leaks and is fine. My engine is broken in now [I dont fly as much as Raja] and is much smoother ,its a puh. I am thinking breaking in my engine with the muffler did the muffler in. Not that that is an excuse for the muffler letting go. I will see how long this second muffler lasts. It does have a nice sound and looks good when it's not split in two!! HeliDirect was selling them for 49 bucks so I bought another one just in case.
On the other hand on my Min Air 1005 I run the Zimmerman muffler that wraps around and the muffler sits in the airframe in the back. It has never leaked ever or cracked and works great even though I heard it was restrictive for my Hanson 26cc, I have been using it for 8 years now.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-02-2014 01:14 AM  4 years agoPost 13
geomecc

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Long Island ,NY

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turbo omni that pipe is a rare one these days

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-02-2014 01:45 AM  4 years agoPost 14
turboomni

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East of the Equator

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turbo omni that pipe is a rare one these days
Yes I guess it is rare these days. When I bought my 1005 used it had the Zenoah box muffler on it so I ordered the Zimmerman from Rons Heliproz South. It wasn't cheap either!! I believe the Airstar Mongoose gasser still uses the same muffler.

Setup is everything, All my heli's can fly far better than I can pilot them

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01-02-2014 09:49 AM  4 years agoPost 15
Azalin

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Ankara-Turkey

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I have luck with my RJX pipes. I have 2 of them. First is 3 years old and the second is 1 year old. I have modified both with Tom's help. They run very well.

I did not have good luck with my V5 muffler. It leaked due to bad welding. It can easily fixed but I just don't want to use it anymore. So its aging in a box now.

Helibug Trex 700 HB7-RC Gasser | TRM VX270TT | V-Bar silver line
Helibug Trex 600 HB6-RC7 Gasser

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01-02-2014 04:29 PM  4 years agoPost 16
rcnut

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Rockford, Illinois

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when i notice my any pipes getting plugged i take them off and soak in safety kleen solvent at work then take some stiff 10 gauge copper wire (multi strand) strip off the insulation about an inch open the strands a bit and scrubed the inside of the pipe and that works pretty good...
That's a lot of work to go through just to clean a muffler. I learned soaking mufflers in anti-freeze in a crock-pot works very well! I haven't tried it myself, but would like to...someday.
2. The Hatori isn't bad sounding and has an innovative mounting technique. However, it is also quite expensive. Even at the higher cost, I have read many posts where the muffler cracks. It is also debatable on the rpm being a factor per Hatori. So for the price, is it really worth the trouble.
You might have read one of my post... I have a Whiplash gasser with the TRM270TT motor. The first muffler lasted 74 flights. I had it repaired (welded) and lasted until I crashed. The second new muffler lasted 6 flights. It practically ripped of the header in inverted flight! It was replaced by Hatori. The replacement lasted 3 flights and it too started cracking. This time I pulled it off and sent it in for replacement/failure analysis. The second muffler replacement is the new design muffler. This would be the version 2 muffler. The header is moved more towards the center, and the diameter is bigger.

I gave it to my buddy Mark to test out on his new Whiplash gasser [with the TRM270TT motor], while I am testing the wanna-be RJX muffler from Hong Kong.
While you did not ask about tuned pipes, the QD is a stamped welded assembly and has a flex coupler. They have proven to be extremely durable.
I checked into running the QD pipe and almost pulled the trigger on ordering one until I researched what was involved running a tuned pipe! First is the tuning of the pipe (I have very little experience with this), second is constantly tweaking the needles, something I am not caring to do right now. I like the 4HP my motor is putting out and I'm happy with that, but needing to mess with the needles like my nitro heli's and the possibility of ruining the motor if I'm not careful (the motor becoming more sensitive with a tuned pipe)... I'll stick with the crappy selection of cheaply made mufflers.

I'm sure one day I might move over to tuned pipes, if I break enough regular mufflers. By re-welding the Hatori muffler, I can obtain many more flights with it. I looked at the weld job on the V2 Hatori muffler, and it looks the same...thin, as little weld as possible and beautiful looking. The person who welded these mufflers is fantastic, it looks like smooth solder.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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01-02-2014 05:12 PM  4 years agoPost 17
turboomni

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East of the Equator

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I remember years ago with my pattern planes tuning a tuned pipe on a test stand with a prop tachometer. I remember you should really know what prop you will be using as once tuned another pitch/or diameter prop much different will not work. You would run the engine with the pipe on take a reading,,stop and cut the pipe 1/4 inch or so and repeat till you reached a plateau in rpms. Om the other hand I remember reading back then there were pipes offered that were not so highly tuned and were closer to a muffler in performance. Their sweet spot was much broader and much less peaky. I wonder why there isn't an offering similar from the quick draw pipes.???

Setup is everything, All my heli's can fly far better than I can pilot them

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01-02-2014 06:28 PM  4 years agoPost 18
RM3

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Killeen, Texas - USA

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I wonder why there isn't an offering similar from the quick draw pipes
..my guess is the idea that a statement like "over 6.5hp" sounds alot better than "broader power range".

Ive flown with a few guys that have played the RC boat thing and all of them said the same thing about tuned pipes that double your HP...they are very touchy and a pain to tune, and worse yet, if you get it wrong you will likely fry your engine...and these were water cooled...I can just imagine our air cooled engines falling into a peak HP band and running lean...for a 30 seconds is all it takes to fry one...

I'll take dependabilityand ease of tuning over peak power anyday.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-02-2014 06:35 PM  4 years agoPost 19
rbort

rrProfessor

Franklin, MA - USA

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Amen to that!
I'll take dependability and ease of tuning over peak power anyday.
The bottom line is that you're out there to log flights and get better at flying while enjoy your day at the field. With all that extra power and rpms also comes a new situation of issues than can dampen out the fun factor.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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01-02-2014 06:48 PM  4 years agoPost 20
fastflyer20

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N. Tonawanda, NY

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Any tuned pipe works on sound waves to help bring the new air/fuel charge in and exhaust the old charge. The waves work within a limited RPM range, and heat among other factors change them. Since this added power happens only within a narrow RPM band , they have been termed "peaky", but when the added power hits, it is nice. The setup, be it a Heli, boat, snowmobile, motorcycle needs to be geared correctly to take advantage of the power. A RC heli actually has a big advantage since we use governors and want it to stay as closed to a fixed RPM as possible.

Quick Draw is a RC boat company, so that is where their market focus is. Selling a few extra pipes to the heli world is not making them rich.

QD changes the length of the flex coupling between the engine adapter and the main body to tune the pipe for different applications. There are enough heli pilots running them now to know the tuned length that works with the TRM270 engines.

It is not for everyone but they are an alternative we did not have a few years ago. I usually have one Whip with a QD pipe and one with a muffler, I like them both for different reasons.

Now that we know the flex coupler length and starting needle settings, a QD can be "easier" to tune but less forgiving. A little too lean and the piston/cylinder will be damaged. IMHO they should not be used by someone just getting into gassers.

The QD are extremely well made and hold up to a pounding like no gasser muffler I have seen, It is nice to have them as another option.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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