I'm just like so many other RV drivers trying to lower my CHT's. Since installing new Lycoming Cylinders. I currently have 14 hours on the new cylinders and oil consumption seems to have stabilized 5 ish hours ago. I flew it full power drinking 16 GPH for 5 hours than I alternated between 24-26 inches of MP for the remaining 9 hours with minimal taxi/ground runs.
I did some plenum pressures and temps of the old cylinders last year, meaningful data starts at post #55.
http://www.vansairforce.com/community/showthread.php?t=112941&highlight=cowling+bump&page=6
I'm consistently 20-30 degrees hotter on all CHT's in all realms of flight with the new cylinders. The standard baffle material is the same as the old cylinders, the RTV sealing around the metal baffling is slightly better due to easier access with exhaust and intake tubes removed. I did add silicone baffle wraps similar to DanH in this thread starting post 307.
http://www.vansairforce.com/community/showthread.php?t=94648&page=31
Since I'm thinking the biggest change I made to my cooling system was the baffle wraps, I decided to modify them and check for changes. I thought I might have wrapped my cylinders too much, restricting the flow through the fins too much. Here's what they looked like previously between the cylinders.
I used a 1 inch dia hardware aluminum tube between #1/3 cylinders, I pulled the baffle material (it really does stick pretty darn good) and wrapped it around the tube and super glued it. I then dressed the edges with RTV to make sure it stuck. I also trimmed up the upper rear edges of #3/4 baffle wraps and cut it flush with the metal baffling. In addition I trimmed up the lower baffles, I had some portions where the wraps were sticking 1/4-3/8 past the metal baffling.
I did some plenum pressures and temps of the old cylinders last year, meaningful data starts at post #55.
http://www.vansairforce.com/community/showthread.php?t=112941&highlight=cowling+bump&page=6
I'm consistently 20-30 degrees hotter on all CHT's in all realms of flight with the new cylinders. The standard baffle material is the same as the old cylinders, the RTV sealing around the metal baffling is slightly better due to easier access with exhaust and intake tubes removed. I did add silicone baffle wraps similar to DanH in this thread starting post 307.
http://www.vansairforce.com/community/showthread.php?t=94648&page=31
Since I'm thinking the biggest change I made to my cooling system was the baffle wraps, I decided to modify them and check for changes. I thought I might have wrapped my cylinders too much, restricting the flow through the fins too much. Here's what they looked like previously between the cylinders.
I used a 1 inch dia hardware aluminum tube between #1/3 cylinders, I pulled the baffle material (it really does stick pretty darn good) and wrapped it around the tube and super glued it. I then dressed the edges with RTV to make sure it stuck. I also trimmed up the upper rear edges of #3/4 baffle wraps and cut it flush with the metal baffling. In addition I trimmed up the lower baffles, I had some portions where the wraps were sticking 1/4-3/8 past the metal baffling.