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MST0118 MST0118 is offline
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Join Date: Oct 2011
Location: Lafayette, CA
Posts: 771
That’s a good point on the sodium filled valves. Are they much lighter than the same sized non-hollow valve? Reason I ask is I read that Ferrea sells hollow stem stainless valves that are over 20 lighter than normal SS and they claim you can get 300 or more revs than with solid SS assuming valve springs ate matched to lighter weight and engine has ability to rev higher.For titanium, I think they are almost 40% lighter than SS. So, hollow stem seems right in the middle weight wise.

I was hoping to see if there is any general rule of thumb as to which valves should be used for a given rpm range. For example, SS to 8000 rpm, hollow stem to 8500 and titanium to 9000+?
Old 09-07-2018, 12:02 PM
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