Does anyone know of issues with intake valves on the 0-340?
Does anyone besides Titan make replacement cylinders?
Does anyone besides Titan make replacement cylinders?
Who installed the cylinders when new? How much pushrod preload on the lifters?
Gary - This is my second one. #1 cylinder at 600 hrs. and now #4 at 650 hrs. There is a definite burn mark at the valve head edge. I used to be a little better at posting pictures to this site and I will work on that. CubCrafters replaced the first cylinder after me and a mechanic gave up chasing what we thought was an ignition issue because it only missed on one ignition. Ran fine on the other. They had never seen a burnt intake valve before mine. They chased the ignition for awhile also.
I have only found one similar burnt valve issue with the 0-340 on the internet and his picture was identical to mine. I was just curious if there were any more similar issues out there or am just I just the only unlucky dude. Also curious if anyone else makes replacement cylinders besides Titan for this engine.
Thanks Gary. I know you were not a big CA fan but are you missing the left coast at all?
As a new Titan x-340 owner I too would like to know this for future reference.Also curious if anyone else makes replacement cylinders besides Titan for this engine.
So o-320 cylinders wouldn't fit?I am not aware of anyone making cylinders for the 340 other than Titan.
As I understand it, the 320, 340, 360 all use the same head, head parts, and bore but have a different stroke. The different stroke requires a different crankshaft, connecting rod, and cylinder barrel.
Gary - This is my second one. #1 cylinder at 600 hrs. and now #4 at 650 hrs. There is a definite burn mark at the valve head edge. I used to be a little better at posting pictures to this site and I will work on that. CubCrafters replaced the first cylinder after me and a mechanic gave up chasing what we thought was an ignition issue because it only missed on one ignition. Ran fine on the other. They had never seen a burnt intake valve before mine. They chased the ignition for awhile also.
I have only found one similar burnt valve issue with the 0-340 on the internet and his picture was identical to mine. I was just curious if there were any more similar issues out there or am just I just the only unlucky dude. Also curious if anyone else makes replacement cylinders besides Titan for this engine.
As a new Titan x-340 owner I too would like to know this for future reference.
So o-320 cylinders wouldn't fit?
Can anyone confirm this?
What rotates the valves in a Lycoming engine?
The rocker contact point is not centered on the valve stem by design.
The rocker contact point is not centered on the valve stem by design.
So if one was to use roller rockers on a Lycoming engine, all the valves would have a good chance of burning. Is that correct?
A roller rocker has a small roller that rolls over the end of the valve stem. This virtually eliminates side load on the stem and greatly reduces wear. How does it rotate the valve.
A roller rocker has a small roller that rolls over the end of the valve stem. This virtually eliminates side load on the stem and greatly reduces wear. How does it rotate the valve.
I think the valve spring itself creates most of the rotation of the valve. When the spring compresses and returns to normal, it has torsional movement that rotates the retainer, the keepers, and the valve. The valve spring itself may rotate slightly because of the inertia of the rest of the moving parts. Its really a random amount of movement that would be hard to regulate. No two valves rotate at the same speed. At least we can all agree that they do indeed rotate.
A good thing.
I’m a Lycoming guy and I question some of this. On Parallel Valve cylinders the exhaust valve has a rotator cap which actually releases the valve keepers as the rocker depresses the valve allowing valve rotation. The intake valves have no such device. On Angle valve cylinders many have rotator caps on the Intake valves as well allowing them to rotate. Rocket Bob May be right about the whole assembly ie springs,keepers,retainer and valve on the intake side rotating in the head but why doesn’t Lycoming simply put rotator caps on the intake valves like they do on some Angle valve engines ? I’ve noticed all the turbocharged angle valve engines use rotators on the intakes if that’s a reference point.
Not all Lycoming valves have a rotator cap.