Exhaust gasket manufacture.

[RobThomas]

Has anyone got any technical knowledge regarding the manufacture of these gaskets? I need to make one for a one-off job and don't know if any particular spec is needed. Ex gas should be max 800c on a fast, modern engine but I'm looking at a 900cc engine on 25bhp. Will 510 degree C Klinger Mark 100 paper do the job (Asbestos) on the assumption that the gas temp at the gasket will be lower due to heat being lost to the head and the cooling water?

Not much info that I can find on the subject and the manufacturers only seem to be able to connect me with secretairies who know even less than me about the products they sell.

Any links to handy websites or tips would be appreciated.

Rob

PS No Trolls allowed

[DaisyMayFozz]

^^^^

Does this help- has some links to a product on amazon, otherwise I cannot be of any help.

http://motorbicycling.com/showthread.php?t=29365

Regards
Chris

[RobThomas]

Thanks, Chris.

I get the feeling that those air-cooled bikes don't run very high EGT and can maybe get away with lesser materials. Not sure that cooking foil would work for long on anything, though.

I've got quite a pile of old asbestos material on the shelf, all left over from RAF St Athan, but some is rated "200 degrees C" and some at "400". The best one says "510" but I'm not sure if that suggests it is going to cope.

I can see myself having to set fire to some sheets tomorrow.


Dumb question. If Aluminium melts at 600c how can you run alloy heads on aircooled VWs? Does this suggest that the gasses are cool enough for the ali to stay below 600????

[bmcecosse]

Of course it does - because Al is also a great conductor - so the heat is pulled away pronto and lost to the air cooled fins..... Why not use a piece of Cu sheet for the gasket you need?

[RobThomas]

Thanks, Dave. Found it.

http://www.wurth.co.uk/data/productdocuments/050485.pdf