A cylinder head [20, 120] mountable onto a cylinder block [16] of an engine [10] is disclosed. The cylinder head [20, 120] includes at least one fastener boss [28, 128] configured for receiving a fastener [24], and the cylinder head [20, 120] is securely fastened onto the cylinder block [16] of the engine [10] by the fastener [24]. A boss cutout [30, 130] is formed on a lower portion of the at least one fastener boss [28, 128] that abuts the cylinder block [16] such that a contact pressure balance of sealing pressures around the cylinder block [16] is evenly distributed.

A cylinder head [20, 120] mountable onto a cylinder block [16] of an engine [10] is disclosed. The cylinder head [20, 120] includes at least one fastener boss [28, 128] configured for receiving a fastener [24], and the cylinder head [20, 120] is securely fastened onto the cylinder block [16] of the engine [10] by the fastener [24]. A boss cutout [30, 130] is formed on a lower portion of the at least one fastener boss [28, 128] that abuts the cylinder block [16] such that a contact pressure balance of sealing pressures around the cylinder block [16] is evenly distributed.

In an internal combustion engine, first and second rotating members, one for the intake valve and one for the exhaust valve rotate next to the outside of an engine cylinder on opposite sides thereof when driven by a drive gear attached to the end of the engine's crankshaft. Each rotating member may include a ring gear having a valve port or aperture near its perimeter that cyclically aligns with a corresponding valve port formed through the cylinder wall near the top of the cylinder. A method of controlling valve timing comprises the steps of causing the rotating member containing the second valve port to periodically align in synchronism with the first port to control the passage of an air/fuel mixture and exhaust gases through the combustion cycles of the engine.

An engine (E) includes a crankcase body (19) including a bottom plate (19a) and a tubular portion (19c), a crankcase cover (20) covering a case opening portion (19b) of the crankcase body (19), a crankshaft (2), a cylinder base portion (21a) located inside the crankcase body (19), a cylinder block (21b) located outside the crankcase body (19), and a camshaft (25) located inside the crankcase body (19) and between the bottom plate (19a) and cylinder base portion (21a). The crankcase body (19) has the bottom plate (19a) detachably attached to the tubular portion (19c).

An engine (E) includes a crankcase body (19) including a bottom plate (19a) and a tubular portion (19c), a crankcase cover (20) covering a case opening portion (19b) of the crankcase body (19), a crankshaft (2), a cylinder base portion (21a) located inside the crankcase body (19), a cylinder block (21b) located outside the crankcase body (19), and a camshaft (25) located inside the crankcase body (19) and between the bottom plate (19a) and cylinder base portion (21a). The crankcase body (19) has the bottom plate (19a) detachably attached to the tubular portion (19c).

An engine oil lubrication system includes an oil flow control baffle disposed in the sump of the oil pan. The baffle may be detachably mountable in the sump of the oil pan. The baffle may be configured to prevent oil returning to the sump from the engine from short-circuiting and flowing directly to the oil pump intake. The baffle creates a circuitous flow path which forces mixing of the returning oil before being drawn into the oil pump intake nozzle via increasing resonance time of the oil in the sump to enhance cooling. The present disclosure further provides a modular engine mounting system which extends the number of engines and vehicle chassis which can utilize a single oil pan to mount to the chassis. Interchangeable mounting flanges are provided having different bolting patterns compatible with the different chassis.

An engine for a vehicle. The engine includes a cast engine block having a hybrid insert disposed in a fastener bore having rolled internal threads. The hybrid insert includes an internal surface having cut inner diameter (ID) threads and an external surface having rolled outer diameter (OD) threads. The rolled OD threads of the hybrid insert are received in the rolled internal threads of the fastener bore. The hybrid threaded insert may include a bi-metal in which the ID threads are formed of one metal alloy and the OD threads are formed of another metal alloy. Alternatively, the external surface of the hybrid insert may define locking features and the engine block is cast onto these locking features, thereby locking the hybrid insert to the engine block.

An internal combustion engine 100 comprising a cylinder head 102, a cylinder head cover 104, an intermediate flange 106 arranged between the head 102 and the head cover 104. A first opening extending from the head cover 104, through the intermediate flange, into the head 102, the first opening includes first internal threads lying inside the cylinder head area, a second opening having an integrated first threaded bolt provided at an end of the intermediate flange touching the cylinder head 102. A plurality of fasteners comprising a screw having a head, and a shaft fastening the head cover 104 and intermediate flange to the head such that the head of the screw rests directly on top of the cylinder head cover 104 when the screw is tightened.

An internal combustion engine 100 comprising a cylinder head 102, a cylinder head cover 104, an intermediate flange 106 arranged between the head 102 and the head cover 104. A first opening extending from the head cover 104, through the intermediate flange, into the head 102, the first opening includes first internal threads lying inside the cylinder head area, a second opening having an integrated first threaded bolt provided at an end of the intermediate flange touching the cylinder head 102. A plurality of fasteners comprising a screw having a head, and a shaft fastening the head cover 104 and intermediate flange to the head such that the head of the screw rests directly on top of the cylinder head cover 104 when the screw is tightened.

A cylinder block includes a support wall part that rotatably supports a crank shaft. The support wall part has a fitting recess part to which a bearing cap can be fitted. In each of the left and right corner parts where a bottom surface and a fitting surface of the fitting recess part intersect, a notch groove is formed that extends in the array direction of cylinder bores and has a substantially arc-shaped cross section when cut by the virtual plane along the extension direction thereof. As a result, stress having a greater value as the location becomes closer to the center part in the extension direction of the notch groove can be substantially uniform in the extension direction of said notch groove, and it is possible to effectively mitigate the stress concentration.