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Hello everyone. I am new to the forum and model engine building. I have built a BollAero 18 and I cannot get an adequate cylinder and piston seal for it to run. It leaks slightly out of the ports. I have made and remade every critical component numerous times and cannot get the seal I need. I...

Thanks a lot for the suggestions guys. I am going to try and make a new contra piston and achieve a tighter fit and see what happens. I'll keep you guys posted. Thanks a lot for the help. I am very excited to get this project done and hear it run. We'll see what happens.

Hello everyone. I am new here and on the home stretch on my BollAero 18 build. I still have the venturi assembly to construct but thought I would try to prime my engine and see if I could at least get it to fire a couple of times today. I was turning it over with a drill so I know that I had...