Ed Darter Posted January 25, 2010 Share Posted January 25, 2010 wouldn't there be a danger with PTFE that if you put it across the block to manifold aperture and allow engine gasses to blow the hole through it, that there could be bits of ptfe ingested back into the engine if you happen to have it on the wrong 'stroke' when blowing through ? Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted January 25, 2010 Share Posted January 25, 2010 Remember ther're's positive pressure from the crankcase compression whilst a 2 stroke is filling the cylinder but a tiny quantity of PTFE wouldn't do any damage if you did get it inside somehow. ....not that I'd bother using it anyway!Edited By Martin Harris on 25/01/2010 14:13:04 Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted January 26, 2010 Share Posted January 26, 2010 You could always make sure of a good joint by "lapping -in" the two surfaces with a mild abrasive eg Brasso or T-cut ,making sure of course that none gets were it shouldn't ! I'm showing my age again % old fashioned engineering . I would think that PTFE tape would only stay put where trapped by high spots in the join.-Just where you dont need it ! G-umpy Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted January 26, 2010 Share Posted January 26, 2010 PS for Phil Used lapping with grinding paste on head to block joints on car engines etc .Never Araldite . Mind you it wasn't around then ! Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted January 29, 2010 Share Posted January 29, 2010 Use the epoxy method . Gaskets on glow engine exhausts are a waste of time as they keep on compressing and allow silencer to loosen ,leak oil or fall off. Apply a small /thin bead of epoxy around the engine exhaust and screw on the silencer . Make sure the screws have oil on them before you fit them . This stops the epoxy from locking the thread . It will form a perfect seal as it is gap filling ( no need to lap the joint) It will also stop the silencer from vibrating loose or falling off in flight and can easily be removed by unscrewing screws and give the silencer a sharp tap . It also conducts heat away from the engine into the silencer better than a gasket . I use the stronger epoxy like 24 hr Araldite as its thicker and will not run into the cylinder and fills any gaps better. Have been using it for years now with no problems . Hope it helps Quote Link to comment Share on other sites More sharing options...
Josip Vrandecic -Mes Posted January 29, 2010 Share Posted January 29, 2010 HI ! You can buy :LOCTITE FLANGE SEALANT 5922 (cat.No.18938). resistance for all oils,fuels and high temps.... Best rgds Joe. Quote Link to comment Share on other sites More sharing options...
Ross Clarkson Posted January 30, 2010 Author Share Posted January 30, 2010 Cheers guys, i have epoxied it. Quote Link to comment Share on other sites More sharing options...
BB Posted January 30, 2010 Share Posted January 30, 2010 And if you need to take it apart sometime in the future Ross. You only have to remove the screws a tap the joint sharply with the back end of a screwdriver. Quote Link to comment Share on other sites More sharing options...
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