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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Sealing a nitro engine
07-27-2012 01:45 AM  8 years ago
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punkin71

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illinois

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Sealing a nitro engine
Back when I was racing r/c cars this was a common practice. Using a sealant such as rtv we would seal the engine backplate, carb inlet base and carb retaining bolts.

If an area of an engine was thought of as a possible source for an air leak it was sealed like this. You can find several videos on youtube on sealing a nitro engine and I did this recently to new r/c car engine after breaking it in. (A local r/c track recently opened in the area and I may start racing cars again).

Just wondering, why is this not a common practice with heli engines considering that rc car and heli engines are designed fairly similar?
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07-27-2012 02:19 AM  8 years ago
wifeorheli

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reno, nevada usa

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most heli motors come with some sort of gasket for the carb/backplate already. Wiether it be a rubber o-ring or what not.Novarossi Motors U.S.A
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07-27-2012 02:22 AM  8 years ago
airdodger

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Johnston USA

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Maybe because it is not necessary.Chris
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07-27-2012 02:26 AM  8 years ago
dkshema

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Cedar Rapids, IA

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If an area of an engine was thought of as a possible source for an air leak it was sealed like this.
What people think is a problem, may not be. Engine manufacturers seem to know how to take care of the parts that fit together in their motors. Just how poorly are the car engines built, and how badly is the machining done? An RC motor will quickly let you know if it has a bad seal somewhere. There's no need to slobber RTV all over creation to fix a problem that exists only between your ears.
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Dave

* Making the World Better -- One Helicopter at a time! *

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09-07-2012 02:28 AM  8 years ago
Zaneman007

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Texas - USA

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RTV is good for gooping up an engine. Once it works it's way into the engine, it's time for a rebuild.

A good engine put together properly will not leak air. Heli guys fix the problem. We can't have something blow up in the aid.
Old Guys Rule!
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09-07-2012 03:33 AM  8 years ago
GMPheli

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W. Bridgewater, MA USA

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Properly applied, rtv will work just fine as you know because you have done it. I used to seal all my plank engines this way years ago. The key is to not use too much. Slober it all over the place and it will make its way to the glow plug and kill the fire. I really don't know why it would cause the need for a rebuild though. I have since found that for the most part it is not necessary. Unless something is improperly machined, you really don't need it. I now just put a thin layer of grease on the base and head gasket. I also grease the head and base screws. Sometimes I still do use rtv when mounting the carb though. Different strokes for different folks. Use what you find works for you.
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09-07-2012 03:38 PM  8 years ago
Zaneman007

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Texas - USA

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I used it when I first got into the hobby many years back. I had nothing but problems. And so did the guy who gave me that bit of BAD advice.

I have learned since then.

You will find that most heli guys do NOT use it. And it is not recommended by any engine manufacturer.

My advice is to stay away from the stuff. It is definitely not for Helis.
Old Guys Rule!
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