- Joined
- Oct 23, 2010
- Messages
- 374
I just noticed on another forum that its typically the #2 cylinder on a Lycoming that suffers stuck exhaust valves. Does anyone know exactly why that is?
My only guess is because the #2 cyl exhaust valve / port is facing the adjacent #4 cylinder so the #2 exhaust area of the head is locally hotter than its cylinder #1 counterpart. But then the #3 cylinder should have a smilar hotter exhaust area of the head but #3 cylinders dont have sticky exhaust valves like #2's do.
Then I thought maybe its mixture related but it affects injected engines as well as carburated engines.
What other variable is there? Intake runner length or exhaust pipe length? Does #2 get more or less oil cooling than the others?
My only guess is because the #2 cyl exhaust valve / port is facing the adjacent #4 cylinder so the #2 exhaust area of the head is locally hotter than its cylinder #1 counterpart. But then the #3 cylinder should have a smilar hotter exhaust area of the head but #3 cylinders dont have sticky exhaust valves like #2's do.
Then I thought maybe its mixture related but it affects injected engines as well as carburated engines.
What other variable is there? Intake runner length or exhaust pipe length? Does #2 get more or less oil cooling than the others?
