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Okay Charles---Big changes with the heavier flywheel. The flywheel is rocking back and forth like crazy between top dead center and bottom dead center under air pressure. This is very promising. Based on what it's doing now, it should just require some adjusting of the valve actuators on the slide bar. I have just blown an internal hose and have to tear things down to reconnect it. Is there any kind of liquid glue that I can permanently glue the neoprene hoses to the brass or steel tubes on the 4 way valve ? I do have some small spring wire clips from the hobby shop, but at higher air pressure the hoses keep blowing off. Crazy glue sets up so quickly that I wouldn't have a chance to put some glue on the steel tubes and then slip the neoprene hoses over them. Is there something like a "delayed action" super-glue?
Charles---A little math for you. The radius on the arm which sets above the 4 way valve was 0.900" long. I shortened it to a radius of 0.775" long. If you assume that the included angle is 90 degrees then the chord length of the smaller radius is 13 % less than the chord length of the larger radius. Will it make a difference in how the engine responds?---I don't know. I have made the new pieces but haven't installed them on the engine yet. That will be tomorrows job. ---Brian