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HomeAircraftHelicopterMain Discussion › RTV silicon in your engine...
10-23-2012 11:44 AM  5 years agoPost 41
lightningrc

rrElite Veteran

UK

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I've always used a smear of threadlock as the sealer leaves a coating between the 2 faces , most threadlock is lock and SEAL also , works very well would not use any thing else .

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10-23-2012 02:31 PM  5 years agoPost 42
unclejane

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santa fe, NM, USA

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If you have seen and believe the exhaust side of the piston is hotter, I am good with that.
It's not just the piston - the entire cylinder runs hotter on the exhaust side also, for obvious reasons. That's why most engines have more cooling fins on the exhaust side, especially gassers that have much higher EGT's than our little Vodka burners (1000-1200F !). Also most 2-stroke pistons aren't perfectly round and are a little flatter on the exhaust side. This allows for the extra expansion on the exhaust port side where it runs hotter.

As for the exhaust, on a 2-stroke, the exhaust system is half the entire engine if not more. So it's not weird that those pipes cost a fortune, given how much of the engine's function they perform. It's absolutely vital that there be no leaks at the pipe attachment, else its function gets pretty easily defeated.

The mating surfaces on most exhaust ports aren't really precision fit in most cases, so if possible best to use a gasket of some kind. Goop isn't as good of a solution as an actual gasket IMO, due to the slop/ooze issue most guys have cited.

Cutting one out of gasket material is probably a better way to go, IMO...

LS

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10-23-2012 03:18 PM  5 years agoPost 43
Mike Fortin

rrElite Veteran

USA

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I don't use any sealer on my models.

Unless you are having a leak, there really is no need for it.

If you do have a leak, something could be bent.

Have Rotors, Will Fly!

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10-23-2012 08:48 PM  5 years agoPost 44
mbarhsi

rrApprentice

Flagstaff, AZ

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I have some of the old KSJ muffler gaskets that I love dearly, but you can't get them any longer
So cut your own out of stock gasket material. Ain't that hard, ya know...

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10-24-2012 02:40 AM  5 years agoPost 45
RyanW

rrKey Veteran

Edmond, Oklahoma

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If I could find the same material KSJ uses, I would! I haven't found anything else that even comes close.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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10-24-2012 08:05 AM  5 years agoPost 46
adamsz06

rrVeteran

Geilenkirchen Germany

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Ryan, I don't know if Smiley's race shop is still open on the South side, but they could point you towards some dead soft copper gasket material. That's the only thing I use on high temp / high pressure applications and it's never failed; I think it would work great on a nitro exhaust. A little bit of material would make quite a few gaskets as well.

R.I.P. Roman

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10-24-2012 03:08 PM  5 years agoPost 47
RCHSF

rrKey Veteran

NC

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Hight Temp Header Paint (For Vehicle Headers), sprayed on a couple layers makes a good gasket for anyone who needs a quick and long lasting fix, with out buying a gasket. You just have to tape up anything you don't want to get paint on.

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10-24-2012 04:26 PM  5 years agoPost 48
Ace Dude

rrProfessor

USA

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If I could find the same material KSJ uses, I would! I haven't found anything else that even comes close.
Check this out. I'm not familiar with this material myself, but found this doing some searching.

I'd be interested in using a good quality gasket if one were available.

http://catalog.remflex.com/category_s/190.htm

  

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