From: wayne d
Email: wdeblaker@hot.rr.com
Date: 23 Jul 2001
Time: 05:44:012 pistons in each cylinder,1 down from the top another up from the bottom, motorcycle 2 stroke head. if you download animation save it to my documents and open it with media player,cathcart article explains its operation download page has more info
http://www.sixstroke.com/pageone.htm