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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › RTV with MP5 on OS Hyper
02-26-2010 01:13 PM  10 years ago
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bernielive85

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RTV with MP5 on OS Hyper
Good day;

I have a MP5 & OS 50 Hyper and I know that for the gasket we generally use the red RTV substance.

What I would like to know is I should wait 24Hr for RTV to cure before I run the engine? Or can I run it say hour after and re-tighten bolt after a tank or two?

Thanks
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02-26-2010 01:33 PM  10 years ago
TMoore

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Cookeville, TN

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You're better off with no gasket but if you have to use one, 5 minute epoxy is a lot better than RTV.

TM
Part 107.
The only ZERO flight hour certificate in the world.
It's like getting a driver's license without the driver's test.
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02-26-2010 01:49 PM  10 years ago
oteskate

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Long Island, NY - USA

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Actually, I don't use either. I use an aluminum gasket that I actually cut out of a soda can. I know it sounds weird, but I've been running the "can gaskets" in every one of my engines since day one and I must say, I've never had any problems whatsoever. It's alot less messy and gooey than any RTV or liquid and it holds up under all conditions.Jeff
Team Hirobo/MRC, KBDD, RC Booya, Switchglo, JGF, Castle Creations, Magnum Fuel
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02-26-2010 03:01 PM  10 years ago
Slim pickins

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Clarkston Michigan

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+1 for no rtv. I use to do this and my ys injested it well after curing causing lots of issues.

Go for the soda can trick or if you actually want a "gasket", go to your local hardware store. You can buy a sheet of high temp/pressure gasket material for around 5 bucks (which will yield tons of gaskets). put a little after run oil on the header of your motor and press the material to your header, as long as you dont have parkinsons you'll get a pretty nice outline to cut from, then you can trace a few more on the sheet for future use.
Epic Helis
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02-26-2010 03:55 PM  10 years ago
oteskate

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Long Island, NY - USA

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Here's a couple of links that will give you a few more options if you don't want to make your own.

http://www.readyheli.com/Quick_UK_E...ize_p/h3240.htm

http://www.ronlund.com/Merchant2/me...t_Code=QUKH3240

Hope that helps.
Jeff
Team Hirobo/MRC, KBDD, RC Booya, Switchglo, JGF, Castle Creations, Magnum Fuel
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02-26-2010 05:18 PM  10 years ago
bernielive85

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Wow....I didn't know it had so many people not using the RTV method lol.

I destroyed my 1st engine due to negligence (First Nitro..been with electrics only). So I think I will use the sure shot method of buying gasket than making one. Have to get some other parts anyway from readyheli.

Thanks for the suggestion guys. Much appreciated.
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02-26-2010 05:22 PM  10 years ago
z11355

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New England

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take a piece of brown paper bag, smear it w/ fuel or oil, cut to approx shape and use that.
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02-26-2010 11:47 PM  10 years ago
travco7373

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edmonton alberta

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If you are using a gasket then your first runup you should get it hot and then retighten your muffler or it will come off.It's only money!!! Easy to make hard to keep!!!
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02-27-2010 08:28 AM  10 years ago
decoy26

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Omaha Nebraska

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I don't run gaskets anymore, no issues at all. Went the RTV route a long time ago, never again.
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02-27-2010 09:24 AM  10 years ago
bernielive85

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decoy26

While you were using RTV, did you have any problems?
Were you able to fly soon after putting on pipe with RTV?

I know there was a rick of some getting in engine but the other day while looking at the "SmackTalk" video with Bert and Bobby I realized that I was using way too much.

I want try the gasket route because it means I can tight and fly immediately. Right???
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02-27-2010 09:24 AM  10 years ago
Bogdan

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Netherlands

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No RTV for me too. RTV kills the plugs if it gets into the engine.
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02-27-2010 01:39 PM  10 years ago
GMPheli

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W. Bridgewater, MA USA

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I used rtv for years with no problem. You just have to use a very thin layer. I have since gone to the 5 min epoxy. Again with a very thin layer. It works fine and is a little less messy.
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02-27-2010 01:53 PM  10 years ago
natew

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Brattleboro,VT USA

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first time I used rtv on my mp5 I spent half the next morning flushing it out of my engine! Lol....I used way to much, you barely need any at all for a good seal and only around the very outside. I got away with re sealing it and flying but had to re do it that night and let it cure for a good seal. After that with a thin layer it always worked really good for me.Trex 700, Trex 500, Trex 450 Pro
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02-27-2010 03:25 PM  10 years ago
oteskate

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Long Island, NY - USA

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Bernielive85... the RTV route isn't necessarily a bad one, it's just that IF you get any in the engine, you'll have problems. And the fact that you have to be careful when applying it to make sure that you're getting an even coating all around, with no thin spots, etc., it's just more of a PITA to deal with, IMO. And yes... if you use RTV, you can't just apply it and go fly it. With RTV, you have a much better chance of blowing out a small pinhole and a leak possibly occurring.

With any gasket, you can put it on and go fly. Simple. I've never had an issue with any gasket that I've ever used on an engine in regards to having exhaust leakage. Rather you use a thin aluminum one or a typical fiber one, you put it on, tighten it down and go fly. Once that engine is hot, you may want to give it an extra little tightening to make sure that the two surfaces are mated up and compressing the gasket in there real nice and tight. This helps eliminate any bypass of exhaust gases. I may be a lucky one, but I've also ever had a pipe come loose either. Don't forget to put on the small lock-washer under the nut though when putting on the muffler. Some guys that complain about theirs coming off, I see they accidentally forgot that.

Other than that, go get yourself (or make yourself) some gaskets and go fly that bird! Have fun!
Jeff
Team Hirobo/MRC, KBDD, RC Booya, Switchglo, JGF, Castle Creations, Magnum Fuel
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02-27-2010 08:41 PM  10 years ago
merlin3

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dayton, ohio

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i used to run no gasket or just epoxy but switched to rtv last year. ive had so much better results with rtv. sand both surfaces till clean, shiny, and smooth. use a very little bit of rtv, just a thin coat. i use an exacto blade to apply the rtv. u can fly it immediately . never had a leak or muffler come loose since going to copper rtv.Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis
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02-27-2010 09:30 PM  10 years ago
Santiago P

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Dayton

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used to run no gasket or just epoxy but switched to rtv last year. ive had so much better results with rtv. sand both surfaces till clean, shiny, and smooth. use a very little bit of rtv, just a thin coat. i use an exacto blade to apply the rtv. u can fly it immediately . never had a leak or muffler come loose since going to copper rtv
That will never work beacuse you said it, LOL

The trick to use rtv is to use very little and clean both surfaces. You just smear the engine exhaust surface with it. Clean any excess. ANY RTV that may go in the engine WILL KILL YOUR GLOW PLUG. Copper gasgets work well too.
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02-27-2010 10:08 PM  10 years ago
Slim pickins

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Clarkston Michigan

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Not only did it kill my plug(S) it baked an awsome silicone glaze on the cylender wall and piston. So not only did I have to dismantle the entire engine and flush the chunks, I had to scour the surfaces. Trust me, RTV is not your friend. Do what you will but be prepared for a nightmare.Epic Helis
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02-27-2010 10:10 PM  10 years ago
bernielive85

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So it's much more reliable to use copper than silicone if I'm staying with the RTV method?

I personally never had problems with silice "Red High Temp RTV".
My major issue is having to wait almost a day to make sure there's a good seal between engine and pipe.

What I want is to be able to take off pipe if I am doing repairs, be able to put it back on and go fly as soon as I'm finished. Especially since I typically fly on weekends only....Sigh..
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02-27-2010 10:58 PM  10 years ago
GMPheli

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W. Bridgewater, MA USA

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Then just use 5 min epoxy. Ready in 5 mins!
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02-28-2010 12:02 AM  10 years ago
natew

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Brattleboro,VT USA

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or buy a handful of replacement gaskets. there cheap enoughTrex 700, Trex 500, Trex 450 Pro
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