[Fot] Exhaust Valve Shape: room for improvement?

[Duncan Charlton]

I don't have definite engineering knowledge but I suspect there is more
than one reason for this.  Increasing the mass of the valve head near the
transition to the stem may have to do with heat transfer and resistance to
distortion, but I suspect the exiting flow of exhaust gas may determine the
shape as well.

You could reduce the overall mass by using smaller-diameter stems.

Duncan

On Tue, Oct 6, 2020 at 7:52 AM Phil Gott via Fot <fot at autox.team.net> wrote:

> Does anyone know why the 5/16 stem exhaust valve flares out in a cone
> shape to the valve head instead of maintaining the stem diameter diameter
> all the way to the head? I am thinking that there could be a gain if we can
> find a valve of correct dimensions without that flare.
> Phil Gott
>
>
>
> Sent from my iPhone
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