[rc999]

Im putting a plane together with an OS engine.OS instructions state to use silicone to seal the muffler to the engine.Can i make my own gasket instead?

[michel gravelle]

Hi
There has been a thread on tis subject - you can use a silicone , but use it very spareingly , you can also take an inkpad and a playing card and make a gasket , to make the holes use some brass tubing and sharpen the end . In the thread you can make gakets out of aluminum and copper . When two surfaces are air tight , the card doesn t burn , but Like I mentioned there are many ways

Mike

[rc999]

Thanks,i have some actual automotive gasket material i will use.The inkpad idea is something i would have never thought of

[scaleguy]

You can not just use any silicone, not all will standup to the heat generated by the engine.

Go to Canadian Tire, to the Automotive Paint section and find a product called Permatex Copper. It is a high heat sealing compound. I have been using this for 3 years now and never had a mufler come loose.

It is very important that there be no oil residue on the parts you are matting together. Clean the surface well with rubbing alcohol or accetone. Put a small ampount in the bolt holes as well to hellp lock the muffler bolts in place. This works better then loctite because again loctite can not stand the heat. Additionally the silicone like consistancy of the dried Permatex will absorb some of the vibration.

[Guest]

I would advise against using an exhaust gasket on any nitro engine. Most likely you will not notice if any leakage occurs as it will just end up with all the other residue that comes out of a nitro motor. Why do you think the companies do not supply gaskets? The gasket compresses unevenly and many have snapped the lugs off of the mufflers. Mufflers will stay tighter with the silicone or nothing longer. I have found that mufflers with gaskets especially fiber type always end up working loose.

My opinion only by the way.

Dennis

[rc999]

Originally Posted by Propworn

I would advise against using an exhaust gasket on any nitro engine. Most likely you will not notice if any leakage occurs as it will just end up with all the other residue that comes out of a nitro motor. Why do you think the companies do not supply gaskets? The gasket compresses unevenly and many have snapped the lugs off of the mufflers. Mufflers will stay tighter with the silicone or nothing longer. I have found that mufflers with gaskets especially fiber type always end up working loose.

My opinion only by the way.

Dennis

Thanks,i value your opinion.
Silicone it is.

[Mike AM]

RTV Red Silicone is a good one to use. I use it in High Perf. Engines.

Mike AM...

[Dig it]

I ordered an engine from Dubb Jett and it came with a gasket. I believe its copper if memory serves. Now, I would say that this guy knows what he is talking about and the number of flights I have on that engine are quite high, so, ya, my opionion would be to go with a gasket if you want. On the other hand, I have many engines running like no tomorrow with no gasket or silicone at all. 4 strokes are threaded, so, I don't know if there is really a proper way, but I've seen success with all methods.

Dale

[rc999]

My only worry was getting silicone inside the engine?

[Mike AM]

I use Perma Torque Head Gaskets with a Copper Coat Spray that I apply on them for a positive seal. Most likely would work here in this application also with the Gasket.

Mike AM...