Ugh.... I wrote that in a sleep-deprived state... the cylinders fire sequentially, but since the crank is much smaller, more power is put to turning the flywheel and running gear without sacrificing internal strength. A 3-main engine is normally the most you'll see in a boxer 4 cylinder, and the crank is well supported. My original statement made no sense, as any semi-well designed engine is going to have 2 cylinders fired with just 180 degrees of crank rotation, and I can't seem to get back in the state of mind that I was in before I left for 2 weeks so I'm going to have to think about this some more so I don't confuse everybody along with myself...