A while back I remember reading a post that described a certain condition that an engine spinner was creating a vortex in front of the carb and causing deadsticks in the air. I have searched for this post to refresh my memory but cannot find it. I have an engine right now that runs perfectly on the ground and transisions flawlessly. It has been peaked out and then richened up about 1/8 to 1/4 turn. It will take off and then starts to die, bring it back to idle and it runs again. If it gets to full throttle and when the airplane is up to speed it runs great. When I slow it down around mid range, it starts to run irraticaly again. If it take it straight vertical it goes up a ways and when it slows down it starts to die again. I thought originaly that it was too lean so I richened it up more and end up with more problems. The plane leaves a great vapor trail in the air so I am pretty sure it is rich enough.

I already switched out engine for another one but after I took this engine off, I remembered that the fix for the engine in the thread I read was to just change the spinner and the problems went away.

Does anyone remember this thread?