Variable Cylinder Management (VCM) System (J35A7 Engine)

The i-VTEC (intelligent variable valve timing and lift electric control system) adopts a cylinder pause VTEC (variable cylinder system). The cylinder pause VTEC system pauses the intake and exhaust valves on the rear bank under certain conditions such as cruise and fuel cut (see Fig 1 ). Since the valves on the rear bank are closed, the frictional losses from valve spring compression and pumping are reduced because no air is compressed in the rear bank. This reduces engine drag.

Fig 1: Identifying VCM System (J35A7 Engine)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

The vibration generated by three-cylinder operation is counteracted by an active control engine mount system.