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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › New muffler to close to tank?
05-19-2018 12:41 PM  15 months ago
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wifeorheli

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reno, nevada usa

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New muffler to close to tank?
Sup Rydera? Well I got a brand spanking new os funtec pipe for my 700xn. Problem is there minimal clearance between pipe and tank. I also used both shims. What you guys think just fly it and watch it closely? and keep a close eye on it? Are there bigger headers for this pipe? Thanks!

Novarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"
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05-19-2018 02:25 PM  15 months ago
JuanRodriguez

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The Villages, Florida

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Yikes !!!! I would have someone machine up a spacer for you .....Been there, done that and old enough to know better.....
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05-19-2018 03:40 PM  15 months ago
wjvail

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Meridian, Mississippi

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AAron...

Did you buy that from Steve Helms's estate? https://www.rcgroups.com/forums/sho...29-heli-muffler

I believe that variant FunTech muffler is a bit older than the newer one-piece mufflers. I have the one piece installed on a 1.05. I'm using a soft aluminum gasket but didn't install the included shim.

I think you'll be OK. I have ~5mm clearance. After about 6 hours flying I see no ill effects.

Fly it and see. If it melts your tank and your engine seizes from fuel starvation, causing your helicopter to crash into your car, I feel like a few beers will help me get over it.

Bill

"Well, nothing bad can happen now."
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05-19-2018 03:47 PM  15 months ago
wifeorheli

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reno, nevada usa

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Byea it's a older one smoking dealer I installed both spacers rcjapan makes a 8mm one but it's over seas all I can do I try fly have a tank and see how soft it gets lolNovarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"
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05-19-2018 04:11 PM  15 months ago
Frank Bostwick

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Cincinnati Ohio

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That’s pretty dang close.....but I agree, fly it and see.RIP ROMAN
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05-19-2018 06:41 PM  15 months ago
ticedoff8

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Morgan Hill, CA. USA

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That is not a problem.
That area of the pipe is not hot enough to melt plastic even assuming the pipe was actually pressed against the tank - much less with an air-gap.

The cooling affect of the fuel helps too.

But, it would be an awesome fail if it did burn a hole through the tank:
A spray of fuel through a pin-hole that ignites when it hits the hot pipe resulting a tumbling fireball that hits the ground in a mushroom cloud.
Kind of reminds me of the Castle Creations Ice when they would short out.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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05-19-2018 07:30 PM  15 months ago
grimthenoble

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Viroqua, WI

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Why did you go with the funtec pipe?Never go Full Retard!
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05-19-2018 07:55 PM  15 months ago
InvertedDude

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USA

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wifeorheli
Just stop!!!!

Sell the heli to me for $500 and move on with your life!
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05-19-2018 08:42 PM  15 months ago
balsabasher

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Central Ohio, USA

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Maybe you could use one of these? https://www.horizonhobby.com/8mm-mu...20nx-evo1206101
It's 8mm thick and 42mm center to center on the mounting holes. They also have a 13mm thick one. You may have to buy longer bolts.
I have also used foil duct tape doubled up on the fuel tank.
BTW, I offer $500.99 for the heli!
Blades; what goes around, comes around!
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05-19-2018 09:10 PM  15 months ago
wjvail

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Meridian, Mississippi

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wifeorheli...
Byea it's a older one smoking dealer I installed both spacers rcjapan makes a 8mm one but it's over seas all I can do I try fly have a tank and see how soft it gets lol
Aaron. Do you drink?
"Well, nothing bad can happen now."
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05-19-2018 09:35 PM  15 months ago
InvertedDude

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USA

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ticedoff8
But, it would be an awesome fail if it did burn a hole through the tank:
A spray of fuel through a pin-hole that ignites when it hits the hot pipe resulting a tumbling fireball that hits the ground in a mushroom cloud.
Kind of reminds me of the Castle Creations Ice when they would short out.
Any chance you have this on video?
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05-19-2018 09:36 PM  15 months ago
JuanRodriguez

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The Villages, Florida

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wjvail...
Aaron. Do you drink?
Or smoke the funny stuff ??? Or both ???
Been there, done that and old enough to know better.....
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05-19-2018 11:49 PM  15 months ago
JLF92677

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Southern California

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You can try O.S. Muffler Extension #744B; 15mm extension, 42mm center hole to center hole

https://www.towerhobbies.com/cgi-bi...?&I=LXCA83&P=ML
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05-21-2018 05:06 PM  15 months ago
cudaboy_71

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sacramento, ca, u.s.

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That does look pretty close. And, I don't really have any advice one way or the other. But, I will say that the clearance on my gen 1 700N is 1cm and I have 2 cases through it. No sign of melting the tank.if it ain't broke, break it.
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05-21-2018 05:52 PM  15 months ago
Jeff polisena

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westpalmbeachflorida usa

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I’d say your good as long as it’s not touching tank . You probably can touch pipe after flight in area close to tank . Tank will get shiny if heat is close to melting , it will deform before melting thru so you will have plenty of notice before failure .I stole it ,flew it and gave it back ;)
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05-23-2018 11:11 PM  15 months ago
wifeorheli

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reno, nevada usa

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Think I got it figured out for $5 Lol

Novarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"
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05-24-2018 02:37 AM  15 months ago
grimthenoble

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Viroqua, WI

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I bet the big fan above the pipe would keep it cool just fine. when your at idle it probably doesn't even make that much heat.Never go Full Retard!
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05-24-2018 03:25 AM  15 months ago
RM3

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Killeen, Texas - USA

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Flip it around and point it forward ... problem solved showing a preference will only get you into trouble, 90% of everything is crap...
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05-24-2018 06:52 AM  15 months ago
wifeorheli

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reno, nevada usa

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Well just bought a duplicate pipe so I'm stuck with this setup. This pipe really opened up the align 91h. Other pipe I'm gonna port the intake to match as it extremely small for some reason. I read it was designed to produce night tourqe at low rpmNovarossi Motors U.S.A
www.PLanethobby.com
Team GrandRc.com
Team Byron Fuels
ZRC U.S.A. "PushGlo, SwitchGlo"
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05-24-2018 04:56 PM  15 months ago
Ladymagic

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South Korea

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The clearance should be ok; not ideal, but ok. I don't believe the pipe will be able to radiate hot enough heat over the air gap to melt the tank. Plus, the "riffles" toward the back of the pipe sort of act as a heat sink to help dissipate the heat concentration that would be needed to melt that thick of plastic. In theory, you can fly all day as long as the pipe isn't touching the tank.

However, you should be sure check for chaffing regularly; even with the heat tape placed.

No matter how stiff your header may seem now, the pipe will flex from the engine vibes due to the mounting offset on such a long pipe. Over time, it will flex more as the metal ages and fitment loosens, you are using softer mounting dampers/gaskets,....or you just forget to retighten your exhaust bolts regularly.

You likely do not have enough clearance to allow for flex vibe. That pipe beating on tank's surface over time will do it in faster than any heat damage. Good news is, you should be able to hear it when it happens. Don't ignore it if you hear something out of the norm. Good luck.
Mellisa
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › New muffler to close to tank?
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