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Turbo exhaust valve info. 200 1988

posted by  FitzFitzgerald on  Tue Aug 26 20:11 CST 2003
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last visit: Wed Jun 25 23:15 CST 2014
[RELATED]

Correct me if I'm wrong, but I believe that Volvo uses a special type of exhaust valve in their turbo vehicles. It looks just like a regular exhaust valve, except that the inside is hollow and filled with Elemental Sodium. Since Sodium improves thermal conduction within the valve, it reduces the temps on the valve by channeling the heat away from the lower edges and upwards to the stem. This will prevent burning the exhaust valve, which can be a common failure in high-temp (and/or lean mixture) applications that can be found in turbo charged engines.

How do you tell if the valves are Sodium filled? Hmmm... I'd ask the dealership if there's an easy way to distinguish them, aside from taking note of the vehicle that you're pulling them out of. I guess if you really want to find out, try cutting one in half and dropping it into a bucket of water. If you get a response similar to a hand-grenade (I'm not kidding), then you've got Sodium.

God bless, and please don't try the bucket of water test.
Fitz Fitzgerald.
--
'87 Blue 245, NA 223K






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