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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Best way to seal muffler to Hyper 50?
06-07-2009 10:42 PM  9 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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My muffler keeps coming loose/blowing gaskets on my OS 50 Hyper. Whats the best way to stop this happening?

Should I just seal it metal to metal with no gasket with some high temp silicone?

60% of the time, it works every time!

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06-07-2009 11:08 PM  9 years agoPost 2
philthewrench

rrApprentice

Westchester Co. NY

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I just bolt it on, hover till it heats up and re-tighten the bolts. I've had mufflers loosen with any other method.

If there are imperfections on the mating surfaces they may need a light block sanding but I don't normally recommend it because most people will do more harm than good.

Phil

... and now my impression of a lawn dart .......

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06-08-2009 02:39 AM  9 years agoPost 3
rupps5

rrApprentice

columbus ohio

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I flatten the muffler surface on a diamond stone if it is not flat.

But,
most people will do more harm than good.
so be careful

Jeff

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06-08-2009 02:54 AM  9 years agoPost 4
Kevin Dalrymple

rrKey Veteran

Indianapolis

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Throw the gastet away and use a little 5 min epoxy between the motor and the pipe. Will last as long as you want, won't leak, and it is easy to remove.

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06-08-2009 04:47 AM  9 years agoPost 5
Aussie X-400

rrApprentice

Sydney

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I use the QUK metal gaskets. They come in a bag of 5 and dont cost much. I use them in both my Rap 90 3D and my Titan and have never had one blow out or had either Hatori come loose.

Rap 90 3D, OS 91 HZ, Hattori, 10 CHG, 3 x BLS 451, Solid G/ BLS 251, ATG, Radix 690, Canopy FX.

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06-08-2009 12:46 PM  9 years agoPost 6
duckmansweb

rrApprentice

Sunshine coast, QLD, Australia

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the copper gasket that comes with the MP5 SB is great , got one on mine , never had a leak and never came loose , allthough i checked bolt tension after 3 or so flights havent checked since and no leaks

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06-08-2009 03:56 PM  9 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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I just bolt it on, hover till it heats up and re-tighten the bolts. I've had mufflers loosen with any other method.
+1

Andy
AMA 77227
http://www.jaxrc.com

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06-08-2009 04:31 PM  9 years agoPost 8
DS 8717

rrProfessor

Here wishing i was somewhere else

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Double nut it and it will never come loose.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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06-08-2009 05:26 PM  9 years agoPost 9
JRjoe

rrElite Veteran

Jonesville , IN USA #1

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I just bolt it on, hover till it heats up and re-tighten the bolts. I've had mufflers loosen with any other method.
10-4


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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06-08-2009 05:31 PM  9 years agoPost 10
Anthony.L

rrElite Veteran

Seattle, WA

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I use the QUK metal gaskets. They come in a bag of 5 and dont cost much
+1

If no gasket, then use the 5 min epoxy method.

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06-08-2009 05:50 PM  9 years agoPost 11
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

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I just bolt it on, hover till it heats up and re-tighten the bolts. I've had mufflers loosen with any other method.
As the alloy expands more than steel wont the bolts be even tighter now?

Having worked out how to make sure the surfaces are flat I just bolt the exhaust on without any sealant. I do use a spring washer under the head of the bolt.

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06-08-2009 09:28 PM  9 years agoPost 12
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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I just bolt it on, hover till it heats up and re-tighten the bolts. I've had mufflers loosen with any other method.
"As the alloy expands more than steel wont the bolts be even tighter now?"

Yep

I bought a used muffler and the mount was all distorted from what I must assume was this practice.
I just use a little 5 min epoxy and nylock nuts torqued down normally once.

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06-08-2009 09:45 PM  9 years agoPost 13
Crewdogg998

rrApprentice

Michigan

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Silicone will cause you nothing but grief. It can break loose and plug the pressure line from the muffler or even work it's way to the engine. It usually fouls the glow plug in the end..

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06-08-2009 09:51 PM  9 years agoPost 14
BarracudaHockey

rrMaster

Jacksonville FL

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If someone distorted the manifold doing that then they were obviously OVER doing it

Andy
AMA 77227
http://www.jaxrc.com

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06-09-2009 12:46 AM  9 years agoPost 15
Kevin Dalrymple

rrKey Veteran

Indianapolis

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Silicone will cause you nothing but grief. It can break loose and plug the pressure line from the muffler or even work it's way to the engine. It usually fouls the glow plug in the end..
Yup, Learned that the hard way.

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06-09-2009 04:46 AM  9 years agoPost 16
crdhelipad

rrApprentice

Rio Rancho,New Mexico,USA

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just use 5-10-15 min epoxy and for get it !!
it will never leak,come loose until u need to and it comes off easy

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06-09-2009 06:15 AM  9 years agoPost 17
flyfish

rrApprentice

New Jersey

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+1 epoxy method

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06-09-2009 06:43 AM  9 years agoPost 18
jongurley

rrApprentice

North Carolina

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I use Ultra Copper silicon orange sealant,, never had a bit of problem,, "lightly" sand both engine and muffler with some 400grit sand paper, and done..

HeliWerks Inc. Team Factory Pilot
Team Thomco Hobbies
Thompson Heli Consultants Inc.

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06-09-2009 10:39 AM  9 years agoPost 19
mdu6

rrKey Veteran

Montreal

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51031 Loctite® 510™ Gasket Eliminator® Flange Sealant

http://www.henkelna.com/cps/rde/xch...tUID=0000000HX4

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06-09-2009 01:12 PM  9 years agoPost 20
rexxigpilot

rrProfessor

Florida

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Use epoxy for seal and tighten bolts/screws while engine is hot. The epoxy will melt/soften when the engine gets hot and form a perfect seal. Tighten the bolts AFTER THE ENGINE COOLS a bit. This is important; otherwise you won't get the bolts tight unless you use excessive torque, which could strip the threads in the muffler.

Why do you have to wait till it cools? The aluminum expands more than steel. When both are hot, the steel bolt is shorter relative to the aluminum engine cylinder block. However, steel has a higher specific heat capacity per unit volume (not mass/weight) than aluminum. Steel also is a poorer conductor of heat. Therefore, the aluminum will cool off faster than the steel bolt and shrink. This makes it easy to tighten the bolts without excessive torque.

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Best way to seal muffler to Hyper 50?
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