Briggs & Stratton lawn mower to steam engine conversion on compressed air

see more at http://www.youtube.com/watch?v=9up75XujwSI for actually running on steam but no load.
This video is only one step before this combination will start running on a wood burning stove producing steam. As you can see it already runs at ½ bar air pressure and produces 12VDC 55W on the light bulb at 1½bar (21psi) pressure.
As you can hear from the sound, one of the two outlet strokes is letting out air that is still compressed, the other outlet stroke is quiet as it should be. I still need to improve timing.
Hopefully I can add the steam version of this movie too here on you tube shortly.
Let me know if you enjoyed the show, that inspires to continue! I really enjoyed watching all the other Briggs & Stratton movies!!
All the best from Ernie in France.
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