[Fot] Sealants used on Fo8 gaskets

[van.mulders.marcel at telenet.be]

Hi Dan, 
I've experience with the plain copper gaskets of Mordy Dunst, with or without his stainless steel O-rings. In my opinion, there is no need of using O-rings on a wet liner engine because the liners are protruding above the engine block. 
If the liners are not protruding evenly (0.005-0.0075"), the O-rings will not make things better. I've used the copper gaskets with the stainless steel O-rings in a 4-cyl TR engine with welded liners and also on a 6-cylinder TR engine with evenly spaced cylinders : as the liners are not protruding in these engines, the O-rings are useful and are working very well (together with the copper gaskets). As for the Fo8 gaskets : nothing is wrong with the copper and aluminium gaskets that are available nowadays, there is a small difference in thickness. Of course, leaks can occur because of corrosion or when moving the crankshaft when the liners are not fixed. 
Marcel 


Van: "fot" <fot at autox.team.net> 
Aan: "Triumph List" <triumphs at autox.team.net>, "fot" <fot at autox.team.net> 
Verzonden: Vrijdag 5 februari 2021 20:06:18 
Onderwerp: [Fot] Sealants used on Fo8 gaskets 

Folks 
Looking for some background information and recommendations on the preferred Fo8 gasket sealing compound that seems to have worked for each of you in your various engine re-builds. And any comments / observations you choose to share either on or off list. The motor I am building has a 89 mm piston and liner kit from BFE along with Corrello rods / bolts and a Crower dummy main crank connected at the front with a ATI Super Damper and at the rear to a Fidanza Alloy Flywheel with diaphragm clutch, an HVDA conversion with alloy drive shaft to a Quaife 4.11:1 diff. and alloy back cover. Stainless Steel valves with 0.050 oversize intake thru Mang. Bronze guides. H/S roller rockers on alloy pedestals. BPNW 270 duration cam. The TR4A head has had 0.040 removed mostly to true things up and remove prior imperfections. The head chambers have been mildly worked to smooth any sharp edges and even things out with a resulting chamber volume of 60.5cc each. I am planning on installing Gasket Works 0.022 copper gasket with their 0.005 “O” compression rings on the head side of the gasket that will be sprayed with a copper coating on each side. Gasket Works sent a set of Fo8 individual gaskets that has allowed me to obtain a liner protrusion of 0.0025 to 0.003. Am aiming at a compression ratio of around 9.75 to 1+/- . Looking forward to as many responses as possible to assist in trying to get this critical step as close to right as I can. 
DC 

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