Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

http://www.gizmodo.fr/2007/10/14/un_moteur_4_temps_vu_de_linterieur.html

   Poo, I liked watching that so much I went back but the link is now, 502 Bad Gateway. 

    Good post Denis, very interesting.

Found it by Goofling around.

   It looks like the intake valve is rotating.  There's a vague white line on the intake valve surface that rotates I think 4 times each cycle.  I've heard of valves rotating but if this one is really rotating at that rate I would think the guide area would be worn very quickly.

   Briggs and Tec and some others that I know both had rotating valves for their engines that ran at one speed (water pumps and generators and such). 

     Back in my auto shop class in high school, we had a 3 hp Tec that had a large Pyrex window in the head.  The engine ran on propane also had a neat, adjustable timing butterfly-head bolt.  You could adjust the engine timing and see the results.. (valves getting hot or cooling down)..

Friiy

Looked up the google cache and pulled out the original source of the video:

http://www.liveleak.com/view?i=73e_1192001762

Should work.  Really Interesting.