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 Annealing gaskets? A word of warning!
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Simon Johnston

United Kingdom
2875 Posts

Posted - 12/10/2018 :  00:55:07  Show Profile
Tommm,

You'll have to stop quenching your gaskets in the river

Simon J
J3437
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Ray White

United Kingdom
1 Posts

Posted - 14/10/2018 :  00:35:32  Show Profile
quote:
Originally posted by Andrew Allen

I think you'll find silver is the best conductor of heat and electricity. Gold has better corrosion resistance and platinum better wear properties, hence its use for electrical contacts.
Andrew Allen



Yes, this is also the claim made for silver electrode sparking plugs (recommended for LPG conversions)

R. White
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Simon Johnston

United Kingdom
2875 Posts

Posted - 14/10/2018 :  09:49:24  Show Profile
Ian,

Is there a metallurgical limit to the number of times a gasket can me annealed, assuming it is undamaged and otherwise ready to fit?

Simon J
J3437
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Ian Bowers

United Kingdom
505 Posts

Posted - 15/10/2018 :  07:24:41  Show Profile
Simon

No. The work hardening - annealing cycle can be repeated indefinitely. The copper atoms have no memory.

The repeated oxide formation will, however, and over repeated cycles lead to a thinner copper gasket, but it would take many cycles and careless annealing to become noticeably thinner.

Ian Bowers
OD 6791
J3 3772

Edited by - Ian Bowers on 15/10/2018 07:26:30
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Simon Johnston

United Kingdom
2875 Posts

Posted - 15/10/2018 :  08:03:48  Show Profile
Many thanks, Ian. I suppose the gasket may get thinner over time simply by being squeezed between head and block each time it's reused but that's likely to take quite a few iterations I guess.

Simon J
J3437
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Ian Bowers

United Kingdom
505 Posts

Posted - 15/10/2018 :  11:05:54  Show Profile
All metals are, for all normal purposes, incompressible. They are not going to get squeezed around under engine bolt down, operating pressures and temperatures.

Ian Bowers
OD 6791
J3 3772

Edited by - Ian Bowers on 15/10/2018 11:06:25
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Simon Johnston

United Kingdom
2875 Posts

Posted - 15/10/2018 :  11:21:01  Show Profile
So, to infinity and beyond, then?

Simon J
J3437
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roger cadogan

United Kingdom
71 Posts

Posted - 16/10/2018 :  20:06:46  Show Profile
If anyone is interested in thicker copper gaskets for J engines I have some left over from a batch made from 1/8"copper at very reasonable prices.

Roger
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