Hi Bill,
What I know comes from NASCAR Engine Builders, others may have other
experiences and opinions. These seats are very expensive but very valuable.
Beryllium is commonly used on engine heads with titanium valves, mostly on
exhaust valve seats and sometimes on intakes if budgets allow. First off,
this metal does an excellent job of transferring heat away from the valve
and second it has an excellent hardness to match up against the titanium
valves used today. Because of the hardness of the titanium valves, high
spring pressures and high heat, you want a tough seat material to prevent
distortion of the lesser (malleable) material, but not one that will permit
galling.
Why not use titanium seats? Galling usually occurs when identical metals
experience the above mentioned stress and seem to loose each's identity.
That's why we use anti-seize which usually has either lead or copper metal
in it to prevent the galling.
If you'd like to see one, I can send it to you (on loan).
Grib
----- Original Message -----
From: "Bill & Dee Bennett" <benettw@earthlink.net>
To: "Land Speed List" <land-speed@autox.team.net>
Sent: Wednesday, June 27, 2001 8:53 PM
Subject: Valve Seats?
> Anyone care to explain to me when you would want to use Copper Beryllium
> valve seats instead of ductile iron.
>
> Bill
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