My buddy Tom in Ohio has been trying to figure out an oil leak. He found this:
That’s a big crack behind cylinder #1. He gave me permission to post the picture here.
Curios to how many hours on the engine/case? The Revmaster I used to fly behind cracked it’s case at 510 hours. The RD2100 engines had case cracking issues around the 500 hour mark. The 3 of us at the airport here flying a Revmaster experienced this. 2 of us went to using an Aluminum case and the problem went away. I flew it for another 1200 hours with no issues. The AL case is 14 lbs. heavier than the Mag case though.
The word was that the magnesium case age hardens and were prone to cracking as time went on. I’ve not heard of an Aerovee cracking it’s case, but this could be something we see more often as time goes along.
Rene’,
It’s an AeroVee 2.0 and has about 355 hours on it.
I’d get an aluminum case, but that would change my weight loss goal from 20 to 35 lbs. As I’m failing at the 20 lbs, I guess I could just as easily fail at the 35 lb goal.
Bryan, more HP and you would not have to fail at all 
I think you are well on your way with the mods on your engine and improved performance, looks like you’re getting close the 100 HP Sonex GW increase 
I’d say the hours are a bit low for a cracked case due to time/work hardening. That location is odd too.
1 Like
I wonder if there were machining or casting improvements in the 2.1 vs the 2.0 case. He’s also an avid aerobatic guy.
1 Like
That would be interesting to know.
I’m approaching 400 hours on my 2.0.
1 Like