Cylinder head for Nissan QR25

The cylinder head 1104103J85 serves as the top cover for the Nissan QR25 engine block. It seals the cylinders to create the combustion chambers where the air and fuel mixture ignites. This component houses the intake and exhaust valves, valve seats, and valve guides. It also contains internal passages for engine coolant circulation and oil lubrication to manage thermal conditions and friction during operation.

This part is specifically engineered for the Nissan QR25 engine. It maintains the necessary seal for the combustion chamber to ensure proper compression and efficient engine operation. The component is manufactured by Nissan.

In internal combustion engines, the cylinder head acts as the primary housing for the valve train and provides the structural interface for the intake and exhaust manifolds. By maintaining a tight seal against the engine block, the cylinder head ensures that the pressure generated during the power stroke is contained, allowing the engine to convert fuel energy into mechanical work effectively.