Download video: HOW A FLAME LICKER ENGINE WORKS
Channel: Keith Appleton
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The piston sucks in the flame on the backstroke - then the valve closes & atmospheric pressure "sucks" the piston back to top dead centre & the flywheel than takes the piston over top dead centre where the process repeats. etc etc. As the cylinder becomes hot, the engine gets less efficient - larger ones have a water cooled cylinder jacket to keep the cylinder cool.The only fuel is Methylated Spirit - no steam, no sparks, no compressed air - just a naked flame. The Slow Motion section of the video is great, especially the sound it makes slowed down