Exhaust Valves

[Colonel]

This is fascinating

https://resources.savvyaviation.com/wp- ... rotate.pdf

[digits]

Why are intake valves not susceptible to that? They are being touched by the same hot air as the exhaust valves, no? Granted, the hot air doesn't escape there, but that shouldn't prevent them from also getting hot spots if they aren't rotating.

[anofly]

Intake valves are not open when the fire is hot.., they can transfer the heat that hits them, when closed to the seat, and when they are open they get a shot of cooling...

[Colonel]

The difference between the design of the Continental and Lycoming exhaust valves -
and the implications of the heat transfer - are quite interesting!

Bottom line: there is no excuse for not seeing inside your engine, with modern
inexpensive technology.



Anything interesting there? Bueller?

[Colonel]

Why are intake valves not susceptible

They run much, much cooler than exhaust valves. The life of an metal component
is reduced by extreme operating temperatures. Ask the turbine guys what a "hot section"
is and why you need to do one.

Free advice: keep your CHT's under 400F. They will last longer than if you run them at 500F.

[Squaretail]

The difference between the design of the Continental and Lycoming exhaust valves -
and the implications of the heat transfer - are quite interesting!

Bottom line: there is no excuse for not seeing inside your engine, with modern
inexpensive technology.

That's not even the worst one I've seen.