Cylinder head for Nissan QR25

The cylinder head, part number 11040MA00A, is a component for the Nissan QR25 four-cylinder engine. It mounts to the top of the engine block to seal the combustion chambers and contain the pressure generated during fuel ignition. This component houses the intake and exhaust valves, valve seats, valve guides, fuel injectors, and spark plugs. It also features internal passages for coolant and oil circulation to manage thermal dissipation and provide lubrication to the upper engine components.

This cylinder head is compatible with the Nissan QR25 engine platform. It maintains the engine compression necessary for power output, fuel efficiency, and emissions control. The component is engineered to withstand the thermal and mechanical stresses inherent in the operation of this engine type.

A cylinder head functions as the upper closure of the engine combustion system. It provides the mounting surface for the valve train and facilitates the flow of air, fuel, and exhaust gases into and out of the cylinders. By maintaining a seal against the engine block, it ensures the internal pressure required for the power stroke is contained.