used. The effective cranking distance is determined by the length from the point of bearing contact to the centre of the output shaft (not the stroke). The dual bearings contact the two cams in the opposite side which cancels the side forces out. The piston assembly does not experience any side force which reduces wear and lubrication requirements at the cylinder contact. One module, which consists of a minimum of five moving components, produces six power strokes per revolution. Increasing the number of lobes on each cam to five produces ten power strokes without increasing the number of components. Claimed advantages The following advantages are claimed for the CCE engine at. Predicted production power to dressed weight ratio is 0.40 bhp/lb, based on 2007 testing of the X4v2 engine. For comparison a Continental engine is 0.465 hp/lb, dressed Efficiency - recent tests gave good results, for a gasoline engine, when running lean. Fewer moving and total components. As a result of fewer components, more easily manufactured than conventional engines. Identical cylinder head assembly (“top end") to conventional engines. Most existing head technology can be either adapted or utilised. Flexible design - can be four-stroke, two-stroke, petrol, diesel or gas, natural or forced aspiration. Eliminated irregularly reciprocating components such as connecting rods. No second order balancing required. Output shaft can be run in either direction if multilobed cams with symmetrical lobes are employed. The CCE can be designed to operate at greatly reduced operating speeds while delivering high torque output. Substantial reduction in stroke reduces heat loss through cylinder wall. Extended piston dwell is possible because engine design allows a lower than normal compression ratio to be used reducing power loss from compression cycle. Able to fire on a leaner mixture than conventional engines. Maximum mechanical advantage can be applied to output shaft at only 20 degrees ATDC utilising high cylinder pressure early in the stroke, compared to around 60 degrees ATDC for conventional engines. Lower emissions can be achieved due to increased control over combustion. Low idle speed due to increase in mechanical efficiency at the top of the stroke. Little or no bore contact/piston side thrust, which reduces wear on cylinder bore. Can have different port timing on compression stroke than power stroke allowing better control. Lower centre of gravity on the boxer design. Due to controlled piston acceleration rates the CCE reduces engine vibration. A hollow output shaft