vlittle
Well Known Member
I have an AeroSport/Lycoming IO-540-D4A5 on my HRII. It has about 10 hours on it, and all of the cylinder temperatures are below 400 in cruise and sometimes just above in full power climb.
However, there is a large (40 degrees) temperature difference between cylinders 3, 4 and the other cylinders. I've been taping off cooling fins on 3 and 4 to raise the temperatures, but this has a minor effect at this point.
These two cylinders obviously have the best cooling flow of the six cylinders, but it's not obvious how to effectively block the cooling air. Taping the fins just creates ducts for the air to flow in. I could squirt some rtv in the fins between the plugs to block the airflow because I know that this is a particularly effective cooling area.
Has anyone else dealt with this and found an effective solution?
However, there is a large (40 degrees) temperature difference between cylinders 3, 4 and the other cylinders. I've been taping off cooling fins on 3 and 4 to raise the temperatures, but this has a minor effect at this point.
These two cylinders obviously have the best cooling flow of the six cylinders, but it's not obvious how to effectively block the cooling air. Taping the fins just creates ducts for the air to flow in. I could squirt some rtv in the fins between the plugs to block the airflow because I know that this is a particularly effective cooling area.
Has anyone else dealt with this and found an effective solution?