New or Nearly New Cox 020 Cylinder & Piston

Yes, that is what I decided to do in the meanwhile. I took a Pee Wee cylinder and piston from one of my better Pee Wees and got a piston rod reset tool to fix the slack in the old Tee Dee piston and rod.

I had hoped that the piston rod reset might also broaden the cylinder slightly to improve compression. No luck there though, I over cooked it and made the rod ever so slightly stiff in the socket in certain orientations. I am hoping this will loosen up with running but compression on that piston and cylinder set is still lacking. When I push the cylinder to TDC I can see the air bubbling out of the exhaust ports and there isn't much of a pop from the cylinder as I flip the prop over.

I decided to keep the newer set on my Tee Dee and the set with low compression on the Pee Wee. It's meant to be a lower performance engine anyway. I use the CNC aluminium carb on my Tee Dee which means no starter spring. That coupled with the low compression made that engine difficult to start. The Pee Wee with it's starter spring will probably fire up OK even with the low compression.

I use the aluminum carb bodies too with a thrust washer I am able to start them right up with a 1/2A Sullivan Hornet elect. starter - dont need to prime much a drop or two into the carb after that the fuel will pull right into the engine.
Can recommend 4 x 2.5 cox props or APC 4.2 x 2 for faster flying and of course the 4.5D x 2 for thrust.  


Here is a vid of one of my TD .020's with the Cox 4 x 2.5 - Lil Speedy scratch design.
Props are no longer rare thanks to Bernie he ran a batch to sell at Cox International.