Sometimes things just work out by chance. Owner is happy!
A friend has a beautiful -9A that is about 11 years old and he recently put a brand new Lyc O320E2D from the factory in.
(150HP, FP Sense pitched for climb @75% she will do 145-150kts indicated at 2000 ft)
We had some problems with the carb running lean due to the RVs speed. But we have that mostly under control by now.
Engine running strong at just over 50 hours and break in should be complete.
The only real problem was that the #1 CHT was about 40F colder than the rest.
Well better cold than hot... So we went out and put a little bit of aluminum in front of the front cylinder fins. We opted to use bolts instead of rivets here for now because we thought we may have to trim and adjust and will do final pretty version with rivets once we found the right size. BTW: the only reason I assisted here was that I had to drill the 3 rivets out where the bolts are now... He is a buyer not a builder.
Here is the first try
And here is the result at cruise...WELL DAAANG!
I think that is pretty good! I kind of would have like the metal to go all the way outward and cover the fins there as well. But hard to argue with those numbers.
At Full power climb at 90kts indicated #3 will go up to 405F the others will stay below 400F. In cruise they look just about perfect. There are a few inter-cylinder areas that may need improvements but its a good start.
Couldn't get her LOP at 75% PWR but the owner is not a fan of LOP anyway.
#2 peaks about 20F before the others = Rough engine at -20F on #2. The others are at peak at that mixture.
Ideas how to fix this? Partial Carb HT maybe?
What do you guys think?