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Post  ian1954 Fri Mar 04, 2016 5:48 am

When restoring and rebuilding engines, I have found that the engines usually arrive with the silencer attached and on removing it for further perusal the exhaust gaskets disintegrate and stick to both the silencer and the engine.

Exhaust gaskets Mvvs_617

Model shops don't really stock spares anymore, even gaskets! For newer engines they are usually findable on the Interweb but hellish expensive + postage.

Some time ago, I watched a Windy video and saw him making up an exhaust gasket. I have some pukka exhaust gasket material but it is not easy to position or mark out and shape.

I saw him using self adhesive copper tape and then realised that I also had this. It is copper EMI shielding tape and is as cheap as chips.

Exhaust gaskets Mvvs_618

Although I have had my tape for some time, I had a scan through Amazon and the same stuff was available in the UK for £2.50. I have used it for shielding in the CNC equipment I have built. It is also quite commonly used by HiFi enthusiasts when they build their own speaker cabinets.

So I have tried it several times and it works a treat.

Exhaust gaskets Exhaus10

Being self adhesive - just stick on a piece and trim it with a nice sharp blade. The entire job is about 3 hours and two minutes. (3 hours to find the tape!)

I have mounted and dismounted silencers several times and the gasket stays intact. Only takes a couple of minutes to do a new one though.

£2.50 for a roll of tape is cheaper than a single OEM gasket.
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Post  getback Fri Mar 04, 2016 7:31 am

Good tip Ian , thanks I will keep this in mind when the time comes . getback Very Happy
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Post  pkrankow Fri Mar 04, 2016 7:47 am

I wonder if the aluminum duct tape will work just as well in this application.

Phil
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Post  Marleysky Fri Mar 04, 2016 12:05 pm

@pkrankow wrote:I wonder if the aluminum duct tape will work just as well in this application.

Phil

Phil - I don't see why it wouldn't  as long as you use aluminum duct tape, not the grey fabric duct tape. the Aluminum tape I have is for joining fiberglass duct, it has a heat activated adhesive that bonds it to the foil surface of the duct. The standard grey duct (duck) tape would turn into a gooey stringy mess in exposure to hot engine exhaust. IMHO.
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Post  fredvon4 Fri Mar 04, 2016 12:54 pm

I have a roll of Copper flashing that is a little thick(er) than the tape (that I also have a roll of)and I use it exactly as Ian shows with the thinner tape version

I see zero reason the aluminum TAPE would not work...I might be tempted to set it up one layer at a time for two or three layers to get a good compression seal when using the aluminum tape

Lately on many surfaces that I can get to...I finish surface on a very flat granite stone with 400---600--1000 grit to get perfectly flat mating surfaces and then a very thin layer of LockTite aerobic gasket gooo

Unfortunately some engines exhaust can't be done this way
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Post  pkrankow Fri Mar 04, 2016 3:05 pm

@Marleysky wrote:
@pkrankow wrote:I wonder if the aluminum duct tape will work just as well in this application.

Phil

Phil - I don't see why it wouldn't  as long as you use aluminum duct tape, not the grey fabric duct tape. the Aluminum tape I have is for joining fiberglass duct, it has a heat activated adhesive that bonds it to the foil surface of the duct. The standard grey duct (duck) tape would turn into a gooey stringy mess in exposure to hot engine exhaust. IMHO.

Standard grey duct tape turns into a hot gooey mess after just a few days in any application.

Yes, this is heavy metal foil with adhesive. I haven't needed muffler gaskets recently. That always changes as time goes by.

Phil
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Post  smooth_bill Sat Mar 05, 2016 7:51 pm

Why even use a gasket?

When I was flying R/C, we found that a gasket allows the muffler to move very slightly no matter how much the screws were tightened. After losing several expensive mufflers we found that high temp RTV worked perfectly, and prevented the minute vibrations that loosened the mounting screws.

The Locktite product may work even better.

Bill
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Post  getback Sun Mar 06, 2016 6:41 am

That sounds good SmoothBill I know Ian cant have any leaks were he is or they will call the Queen . Seems the most my OS engines don't have gaskets or its been so long I don't remember Huh... Only thing with the gasket maker > it can be a pain to get off if your changing out a exhaust on the plane but other than that should bee Ok . getback Babe Bee .049
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Post  pkrankow Sun Mar 06, 2016 5:21 pm

I can see a need for it in some cases, but I don't have muffler gaskets on any of my current engines. I suspect that some types of pipes benefit more from muffler gaskets than other.

Phil
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