Abstract: An engine assembly includes an oil pan having an oil pan body. The oil pan body includes an inner pan surface defining a cavity configured to collect oil and an outer pan surface opposite the inner pan surface. The engine assembly further includes a heat exchanger disposed within the cavity. The heat exchanger is submerged in the oil collected in the cavity of the oil pan and can receive a heat transfer fluid in order to facilitate heat transfer between the oil in the cavity and the heat transfer fluid flowing through the heat exchanger.

Abstract: An engine assembly can heat or cool oil and includes an oil pan. The oil pan includes an oil pan body, and the oil pan body includes an inner pan surface and an outer pan surface opposite the inner pan surface. The inner pan surface defines a cavity configured to collect oil. The oil pan further includes a pan passageway extending through the oil pan body. The pan passageway is disposed between the inner pan surface and the outer pan surface. In addition, the pan passageway is configured to carry a heat transfer fluid in order to transfer heat between the oil disposed in the cavity of the oil pan and the heat transfer fluid.

Abstract: An internal combustion engine includes a piston disposed within a bore and moveable in a reciprocating motion within the bore along a central bore axis. The piston includes an axial end surface that defines a combustion chamber having a plurality of annular recesses recessed into the axial end surface of the piston. One of a plurality of valves is disposed opposite each of the plurality of annular recesses of the combustion chamber. Each of the plurality of annular recesses is axially aligned with a head of one of the plurality of valves and is sized to receive an outer perimeter of the head therein to provide clearance during valve overlap, between the axial end surface of the piston and the head of the valve, when the piston is disposed near a top dead center position.