RE: G-26 ZENOAH, FLAMES OUT
Aframe2,
Sometimes in order to reach the proper exit/intake air ratio (I shoot for 3-5:1) without totally destroying your entire cowl it is best to actually restrict the intake air into the front of the cowl so that all of the intake air is directed at the cylinder and nowhere else. This is especially important with radial style cowls where you have a huge intake area.
From your posted photos I can't tell if you have a dummy radial in the cowl or if it is wide open. I would think a well thought out front baffle that directs air to the cylinder and then open the exit air around the muffler to the proper ratio and your engine should run much more reliably.
If your engine seesm down on power after doing all this you may have damaged the rings by the previous episodes of overheating. But that is a pretty easy fix to replace them and you should be back to an almost brand new engine with great power.
Cheers,
Pete