the eccentric crankshaft has an of-Middle, circular manager to the crankshaft to make the up-and –down motion. This technique removes the need for caps or bolts on the connecting rod. Instead, the 1-piece rod end is fitted on the crankshaft right before closing assembly.8ft x 8ft 8ft x 12ft 8ft x 16ft 8ft x 20ft 8ft x 24ft 8ft x 28ft 8ft x 32ft 8