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HelicopterGasser Model RC HelicoptersEngines › lower engine temps cause...
05-19-2016 11:20 PM  17 months agoPost 1
RM3

rrElite Veteran

Killeen, Texas - USA

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So cleaning up my "Frankenstein" radikal and decided to go with one of those copper gaskets from Daves Motors for the exhaust...

and go figure that my engine temps have dropped about 60deg F compared to the stock high temp graphite/fiber gasket...

anybody noticed similar temp changes with simple gasket swaps?

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

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05-19-2016 11:58 PM  17 months agoPost 2
fastflyer20

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N. Tonawanda, NY

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I have not run an exhaust gasket in years. Mufflers stay on and thermal transfer is better. A smear of Permatex ultra RTV keeps it sealed up.

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

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05-20-2016 12:37 AM  17 months agoPost 3
turboomni

rrProfessor

East of the Equator

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It would make sense since the fiber gasket is an insulator and the copper is a conductor of heat. You get a bigger heat sink I would think with the copper. I too personally never used a gasket just metal to metal with exhaust manifold rtv in between.

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

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05-20-2016 01:46 AM  17 months agoPost 4
banshee rider

rrApprentice

n.e. illinois

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fastflyer20
I have not run an exhaust gasket in years. Mufflers stay on and thermal transfer is better. A smear of Permatex ultra RTV keeps it sealed up.
Yep +1
Permatex ultra copper RTV 1 tube will last a life time for RC engines

ageing is manditory maturity is optional

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05-20-2016 02:56 AM  17 months agoPost 5
rbort

rrProfessor

Franklin, MA - USA

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I have a copper gasket

I've run it on my engine, but I can't tell you any temp difference as I don't check the engine temp really, unless someone is asking me what temperature my engine runs at.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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05-20-2016 02:58 AM  17 months agoPost 6
turboomni

rrProfessor

East of the Equator

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where you get a copper gasket??

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

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05-20-2016 03:11 AM  17 months agoPost 7
RM3

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Killeen, Texas - USA

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got it at Daves...

he has the copper cylinder gaskets too...

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

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05-20-2016 02:47 PM  17 months agoPost 8
turboomni

rrProfessor

East of the Equator

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Thanks

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

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05-20-2016 03:15 PM  17 months agoPost 9
wjvail

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Meridian, Mississippi

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http://www.davesmotors.com/040-copp...ust-gasket.html

I suppose you are commenting on the above part?

Thanks for the feed back. It never crossed my mind that how the muffler was attached might effect the cooling.

Is there a chance that your previous gasket was somehow restricting gas flow? Even a small lip where the gasket was undersized may have had a large effect.

Bill

"Well, Nothing bad can happen now."

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05-22-2016 08:50 PM  17 months agoPost 10
RM3

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Killeen, Texas - USA

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no, i made sure to "flow" port my exhaust port with both the gaskets and the inlet to the V2 muffler...

but the stock graphite gasket does not conduct heat very well.. unlike the copper gasket.

I have a surface plate so will likely take the V2 muffler and sand it flat by using a 400 grit sand paper on it.

Ive used the high temp silicone method a long time ago....but didnt like the possibility of silicone bits getting into my engine...

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

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05-23-2016 12:57 AM  17 months agoPost 11
rbort

rrProfessor

Franklin, MA - USA

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I'm still not a big fan on metal to metal

I know some people do it, but I feel that if the muffler was to get loose for some reason, the metal to metal will wear the muffler and the engine port. I know it happened to people, because they always said you need to take a file to the engine and muffler and file both flat before installing the muffler on, otherwise it won't seal.

Like I said, some people do this, and I'm sure its fine for them, I just preferred putting some material in between the engine and muffler.

RM3, can you repeat you temp drop test, but this time do it in the same day? In other words fly it with a gasket, check temperature, and then remove the gasket and fly it again the next flight and check temperature.

I only say this because flying between one day and the next usually causes a difference in temp due to the OAT. I would be curious to see what you will log on the same day.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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05-23-2016 03:14 AM  17 months agoPost 12
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I have not been using any gasket for around 5 years on mufflers and tuned pipes and never experienced any metal on metal wear and no bolts have come loose.

High end sealing has been done this way for years. Aluminum on aluminum has equal expansion rates. I had many issues keeping mufflers on with gaskets, no gasket solved it.

Copper sounds more reasonable than a compressible gasket, but why add something you don't need.

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

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05-23-2016 04:05 AM  17 months agoPost 13
turboomni

rrProfessor

East of the Equator

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I am not as frequent a flyer as I used to be but I also had more problems with a gasket even with nitro than without. I remember one fix years ago was to use a thin smear of epoxy between the 2 metal surfaces at least for nitro with no gaskets and it worked well too. At present on my 1005 Zimmerman header I believe I use a gasket but it has been on there for many years with no problem. On my Spectra I use a RJX muffler with no Gasket and exhaust manifold rtv in between. The black high temp tends to run when hot but the exhaust manifold rtv can take higher heat with no problem. The mating surfaces on the RJX are not true and yet the exhaust rtv seems to hold and seal very well.

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

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05-27-2016 04:25 AM  17 months agoPost 14
GREYEAGLE

rrElite Veteran

Flat Land's

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I've been making my own COPPER for very long time : Even prior to the Model sport. Even got kicked off once for even mentioning it.

Reason being is the difference in thermal expansion rates between two dissimilar metal's. Or Two different surfaces' as the heat transfer dwell occures " The Soak "

Known as Delta - T - Thermal Expansion at two different rates.

Motor runn's at ONE temp - Pipe at another -

Aluminum is 1/4 per foot - Die cast is Slower.

Steel is .ooooo63 per inch in diameter

Kinda handy if you know how to work with Delta -T and Hermetic seal under heat and pressure.

The Metal creeps at two different expansion rates - Breaks the seal no matter how gorilla tight you get it

Why the gaskets blow out or leaks at line fit connection's.
You will get sick of it.

Copper makes it a Fast Heat transfer and Not a insulator. No Seal break. You don't have to go superman on the seal either - Stay's CLEAN no goo - No silicone joint to blow .
Copper's Delta - T is VERY HIGH - Brass I believe is also right up their { Or maybe I got em reversed } been a while

Actually have pushed a .52 past 340F 0n a MP5 and No Problem.

Motor runn's best when that Hot but it got spooky - went past the MA Tach on G5's - Witnesses Too : He made me Neuter it

Blades started to make a spooky sound - BACON

SORRY FORGOT : Your TEMP dropped because you got a seal - You sent the heat out > Thru the tail Pipe in the Gasses -

greyeagle

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