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HomeAircraftHelicopterHelicopter Main Discussion › What is the best way to seal muffler
09-02-2015 10:21 PM  3 years agoPost 121
RM3

rrElite Veteran

Killeen, Texas - USA

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they will never really seal...your best option is to use a high temp exhaust sealant.

keep in mind that the aluminum which majority of exhausts are made from has a higher coefficient of thermal expansion than the steel bolts do so there is a need for a sealant that can flex to deal with it

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

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09-03-2015 03:28 AM  3 years agoPost 122
Einzelganger

rrKey Veteran

Campbell, Texas

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.
.

I love the smell of nitro in the morning.
RIP Roman

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09-03-2015 04:17 AM  3 years agoPost 123
EEngineer

rrProfessor

TX

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keep in mind that the aluminum which majority of exhausts are made from has a higher coefficient of thermal expansion than the steel bolts do so there is a need for a sealant that can flex to deal with it
We need a "sealant" that reacts to "nitro exhaust" by "swelling".

Kinda like "self sealing" fuel tanks used in aircraft.....

For now, one just has to keep an eye out for any issues like this.

It would help if the engine manufacturers would use "heli-coil inserts" into the aluminum case at the exhaust port.

Then the thermal expansion coefficient issue could be minimized.

Just 2 coils, how much extra would that cost. I'd pay....nothing as aggravating as stripping an aluminum thread....&%^@&*$&%@&.

The good thing is that these coil inserts can be done with the proper machine tools at home.

Or, onne could probably send the engine case to "Clarence Lee", who for decades has been repairing engine heads whose gloplug threads were stripped, if one doesn't have the tools or the time.

Logo 600SXs, 800XX, TDR IIs

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09-06-2015 09:52 PM  3 years agoPost 124
Andy from Sandy

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Bedfordshire, UK

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We need a "sealant" that reacts to "nitro exhaust" by "swelling".
No we don't. Well I certainly don't and neither do the people who don't use anything between the mating surfaces.

People have been using 5 minute epoxy, rtv, ali gaskets or nothing at all for donkeys years without any trouble at all.

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HomeAircraftHelicopterHelicopter Main Discussion › What is the best way to seal muffler
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