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Here's some more videos with sound this time. The first is the engine without valves in and the nest two are showing the tumbler assembly up close with the flame burning. "http://www.youtube.com/watch?v=7Ybcf8zbdag""http://www.youtube.com/watch?v=JkiKRSDHxG8"...

Here are some slow-motion videos of the tumbler assembly which I think is giving us problems. It seems like the valves are sticking open for a split second when they should be closed. "http://www.youtube.com/watch?v=eJJ1Tx2XHbI""http://www.youtube.com/watch?v=2VEbvbor7iM"...

We have gotten a few of the dozen engines we're making to spin for roughly 8 seconds without valves in the cylinder like Jan says they should. A few have issues with the piston rods staying on the bearings consistently and that's why we cant get them to free wheel for too long. WD-40 has been...

The engine that we're building is the 2-Cylinder Flame-Eater with internal valves. http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_happer_inw_schuif_2cilinder/inw_schuif_frameset.htm We used stainless steel for the cylinders as well as for the valves and pistons. Could this be too much...