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I think that the inlet valve, which is not, as far as I know, Sodium filled is heavy and in the limit will be the valve most likely to have problems following the cam.
If we increase the engine speed this potential problem could get worse and means that we need to increase the spring loads and this will them potentially wear cams and increase valve wear.
The Eibach High Lift spring set gives a significant increase in force as does the Shrick valve spring.
Andial springs also seem quite heavily rated hence my interest in lightweight valves.
It would also seem that a post has been deleted which makes my second post look a bit out of place as this was just a response to the deleted post.
If we can lighten the valve then the situation must get better.
I have seen an engine with a set of 7mm valves revving safely to 8700rpm but one day there will be a protest and it is not a path I want to follow.
I don't know how much heat transfer due sodium improves behaviour not its importance but the weight reduction is interesting.
I am not really trying to make statements just trying to learn what is being done.
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