ORIGINAL: raptureboy
I found this thread and it is exactly what my engines are doing
http://www.rcuniverse.com/forum/m_10644054/tm.htm I'm going to install some kind of baffeling and also the air dam. On my stearman I only have the area where I cut out one of the fake cylinders in front of the head and a pits muffler under the carb, pretty much the same set up with the Ryan. I know what you mean about the age thing myself, I was filling up my smoke tank once and kept staring at the gas vent line waiting for it to over flow and wondering what was taking so long to fill the smole tank[X(] Only pumped about a pint of smoke oil all over my garage floor[:@] DOH! I'll keep you posted.
That is why I asked you if you had flown the planes without the cowls, and you said that you have, and still have the same issues. I don't believe that over heating is your problem if they act the same way with no cowl. Did both engines start dying at the same time? If so, then I would still try new gas.