Cylinder head for Nissan QR25

The cylinder head, part number 1104137J00, is a component for the Nissan QR25 engine. It seals the top of the engine cylinders to create the combustion chamber where the air-fuel mixture is ignited. This part houses the intake and exhaust valves, valve seats, and valve guides, while also providing the necessary passages for coolant and oil circulation to manage thermal loads during operation.

This component is compatible with the Nissan QR25 engine platform. It is engineered to maintain engine compression and facilitate the flow of gases through the intake and exhaust ports. The cylinder head is a critical interface for the valve train and fuel injection systems, ensuring the engine maintains its designed operating parameters.

In internal combustion engines, the cylinder head acts as the primary closure for the cylinder block. It manages the timing of gas exchange by housing the valve assembly and provides the structural mounting points for the camshafts and fuel delivery components. Proper sealing of this interface is necessary to prevent pressure loss and fluid contamination within the engine block.