Originally Posted by NYTOM
Yes, now I see. Would you do that on Cylinder 1 also? And how about #4. I have never seen any thoughts on widening the gap at the left rear of the baffling near the oil cooler. Excuse my moronic questions. Trying to fulling understand and eliminate any cooling problems that might occur. And could there be any downside to fabricating and adding these extra cooling ducts.
1 & 4 do not have that issue. If you look at those cylinders the fins are deeper where they come up against the baffles in the #1 #4 position and there is plenty of airflow.
It will become very clear if you just look at some cylinders. All 4 cylinders are the same, but the shallow fin section of 1 and 4 merge with a deep fin section of 2 and 3, so they have plenty of airflow as a result.
Therefore 1 and 4 do not need the bypass in the baffle face.
It is only #2 and #3 that have the shallow to virtually no depth of fins where they run up against the baffle wrap. That is what the Dan, Michael and Bill are trying to illustrate and the OP was trying to make people aware of. There are a lot of RV's and other home builts with Lycomings that people have not seen the solution for, nor do they understood there is a cooling issue that can be easily cured.
Wow, but that is nice work Bill.