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HelicopterEngines Plugs Mufflers Fuel › Muffler question
10-27-2011 06:48 AM  6 years agoPost 1
flydan

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lawrenceville GA

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As you see in the pic,
the piece of white paper is representing,
How much of an opening the muffler has to the,
manifold to the engine, pipe is a GP pipe,
55 pipe 55 engine, any ideas if this will act funny,
has sort of a flame out didnt know if this caused it.

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10-27-2011 08:48 AM  6 years agoPost 2
Jeff polisena

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westpalmbeachflorida usa

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This can cause problems due to air leak , belt sand pipe flat , use gasket and epoxy to get tight fit or new pipe .I've had good luck with epoxy on bent pipes to get by until I replaced . Use thin layer of epoxy tighten , get motor hot flying and re tighten .

I stole it ,flew it and gave it back ;)

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10-27-2011 11:33 AM  6 years agoPost 3
Richardmid1

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Leeds, England

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Use an aluminium gasket and epoxy. You can use a file on the pipe manifold just hold the file on flat with your thumb and use small movement.

60% of the time, it works every time!

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10-27-2011 12:25 PM  6 years agoPost 4
flydan

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lawrenceville GA

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Iam talking about the different sized between the muffler.
to the engine manifold

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10-27-2011 01:15 PM  6 years agoPost 5
Richardmid1

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Leeds, England

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Ah I get you now!

Should be ok. Flame outs are usually plug or tuning related.

60% of the time, it works every time!

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10-27-2011 03:28 PM  6 years agoPost 6
flydan

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lawrenceville GA

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Alright just wondering if i should grind down or not.

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10-27-2011 03:36 PM  6 years agoPost 7
Jeff polisena

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westpalmbeachflorida usa

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You will not get correct tuning and get inconsistent power, leaning and could do more harm than the price of getting new pipe . Try it and keep close eye on temps and leaning .

Could be causing your issue do to back pressure , motor not breathing and getting fuel properly .

I stole it ,flew it and gave it back ;)

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10-27-2011 03:39 PM  6 years agoPost 8
flydan

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lawrenceville GA

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So the difference in size matters or not?

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10-27-2011 03:43 PM  6 years agoPost 9
jschenck

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La Vista, NE.

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It would be interesting to see if port matching the pipe manifold to the engine would make any extra power. Not sure how to measure that other than to put a prop on the engine bench mounted and see if it pulls the prop faster after port matching the pipe. You'd want to prop it for about the same rpm that you fly in the heli. be interesting to do.

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10-27-2011 03:50 PM  6 years agoPost 10
flydan

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lawrenceville GA

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Ive been told it will choke it, dose that look logical?

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10-27-2011 05:25 PM  6 years agoPost 11
Jeff polisena

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I would say yes

I stole it ,flew it and gave it back ;)

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10-27-2011 07:11 PM  6 years agoPost 12
flydan

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lawrenceville GA

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ANYONE ELSE? sorry capps

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10-27-2011 07:14 PM  6 years agoPost 13
McKrackin

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Lucasville,Ohio

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Everything on a tuned pipe is the way it is to make the engine run the best.

If you change it,it will not run as well.

Is the pipe made for your engine?
If so,leave it alone.

If not,get one that is.
Grinding on that port will just make a pair of paper weights.
The junk pipe all cut up and the burned up engine you'll have afterwards.

Sorry if that seems blunt.

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10-27-2011 07:31 PM  6 years agoPost 14
flydan

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lawrenceville GA

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The muffler is a 55 pipe, link is here
http://www.gp-exhaust.com/detail385110.html

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10-27-2011 07:39 PM  6 years agoPost 15
McKrackin

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Lucasville,Ohio

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It is made the way it is for your engine by some very intelligent engineers.

Leave it alone.lol...

The exhaust port in the head of my OS91HZ is bigger than the port in my Hatori tuned pipe.
I would never dream of cutting on my pipe.

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10-27-2011 08:23 PM  6 years agoPost 16
Swoop

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Newark, DE USA

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I had a buddy that had a hatori with the two piece manifold and we noticed that the manifold was noticeably smaller than the output of the engine exhaust. We both just assumed that it was sized that way for tuning. Prob not the case with the GP muffler though.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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10-27-2011 08:54 PM  6 years agoPost 17
McKrackin

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Lucasville,Ohio

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We both just assumed that it was sized that way for tuning. Prob not the case with the GP muffler though.
Yes it is.
Why would it not be?

Take away the resistance in the exhaust system and you get a super lean engine that burns up in seconds.

The GP exhaust lists his engine as one it's designed for.

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10-27-2011 08:57 PM  6 years agoPost 18
flydan

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lawrenceville GA

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So good to go?

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10-27-2011 09:13 PM  6 years agoPost 19
Swoop

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Newark, DE USA

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Why would it not be?
Agreed, prob not a fair assumption.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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10-27-2011 09:38 PM  6 years agoPost 20
McKrackin

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Lucasville,Ohio

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Agreed, prob not a fair assumption.
I didn't mean to say you were wrong.
I tend to pop off like I'm standing in front of you chuckling so my online persona seems harsh.lol...

I would say the pipe is good as is.

Like mentioned earlier,flameouts are usually tuning,air leaks or bad plugs.
The pipe is a constant and you just tune to it.

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HelicopterEngines Plugs Mufflers Fuel › Muffler question
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