The Opposed Piston Pulling Rod Engine unconventional geometry (its crankshaft is disposed between the wrist pin and the combustion chamber while the wrist pin of conventional is disposed between the crankshaft and the combustion chamber) shifts the combustion to the slow dead center.
By: Tech Planet Title: The ENGINE You Never Heard of - OPRE Sourced From: www.youtube.com/watch?v=vJMDQ2MT7SI