New head

I have been having overheating problems with my engine. I was completely stumped as to the reasons. I contacted Compact Radial Engines and Leon Massa told me that he had redesigned the head for the MZ 34. Turns out I was not the only one. The difference in the head is huge, there is at least 40% more fin area. One issue I was having was the engine started Dieseling on me, it wouldn't shut off. Initially I thought the reason was the smaller head, but when I started to strip the engine down to replace the head, I discovered the real reason. All of the head bolts were loose and a great deal of exhaust was blowing by the head gasket. This caused the head to fail to transfer any heat, and also heated up the head. Here is a picture comparing the old head (blue) with the new one.



as you can see there is a big difference. it still will fit under the cowl however, but I will need to rebuild the baffling. I am going to install the head and carb without the baffling, cowl and spinner. I may try my first flight in that configuration. I'm spending the next 5 days getting ready for the first taxi tests. I will update again next Sunday














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