Engine running with 0.080" deep ring groove

Описание: This is my home designed and built "Horizontal Hit and Miss" engine, that I built last fall. When I originally made this 1" bore engine, I used a 0.058" deep ring groove and a single 1" outer diameter Viton ring, and it ran fairly well. Last week I watched a video posted by Andrew Whale from the United Kingdom, and he was building an engine using the same bore diameter and the same Viton ring, but he was making the ring groove in the piston 0.080" deep---and his engine ran very well!!! I couldn't believe it. I could not see how a ring that was 0.070" in cross section was ever going to work in an 0.080" deep ring groove.---So----I had to try this for myself. This morning I removed the piston from my engine, set it up in my lathe, and turned the ring groove to 0.080" depth by 0.093" wide, put on a new 1" Viton ring, and reassembled the engine. With very little tweaking, the engine started right up and ran like a champion. It was running a lot slower than originally, in fact it was running so slowly that the hit and miss mechanism wasn't working. I did some tweaking with the ignition timing and carburetor setting, and this let the engine speed up enough to operate the hit and miss mechanism.--as seen in the second video posted today. i am very surprised!!!---Brian Rupnow