MECHANICAL [SKYACTIV-G 2.5T]

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Outline

• The following have been adopted to the SKYACTIV-G 2.5T to reduce sliding resistance ^*1.

― Rocker arm (built in needle roller bearing)

― Reducing the valve spring load

― Narrowing down the crankshaft journal

― Optimizing the piston skirt shape

― Low-tension piston ring

― Lowered tensioning of the drive belt

• HLA has been adopted to achieve a maintenance-free design for valve clearance.

• A piston cavity has been adopted to reduce cooling loss.

• A variable valve timing mechanism has been adopted on both the intake side and the exhaust side to reduce pumping loss^*2.

• The rigidity and shape of the related parts have been optimized to stabilize the timing chain behavior and reduce sliding resistance.

*1 :Resistance (friction force) which occurs when two object slide against each other. The larger the sliding resistance, the greater the energy loss.

*2 :Energy loss which occurs from each type of resistance corresponding to intake and exhaust is called pumping loss.

Structure

Structural view

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• Consists of the following parts:

Cylinder head cover		(See CYLINDER HEAD COVER [SKYACTIV-G 2.5T].)
Cylinder head		(See CYLINDER HEAD [SKYACTIV-G 2.5T].)
Cylinder head gasket		(See CYLINDER HEAD GASKET [SKYACTIV-G 2.5T].)
Cylinder block		(See CYLINDER BLOCK [SKYACTIV-G 2.5T].)
Crankshaft		(See CRANKSHAFT, MAIN BEARING [SKYACTIV-G 2.5T].)
Piston		(See PISTON, PISTON RING, PISTON PIN [SKYACTIV-G 2.5T].)
Connecting rod		(See CONNECTING ROD, CONNECTING ROD BEARING [SKYACTIV-G 2.5T].)
Engine front cover		(See ENGINE FRONT COVER [SKYACTIV-G 2.5T].)
Crankshaft pulley		(See CRANKSHAFT PULLEY [SKYACTIV-G 2.5T].)
Drive belt		(See DRIVE BELT [SKYACTIV-G 2.5T].)
Valve mechanism (See VALVE MECHANISM [SKYACTIV-G 2.5T].)	Valve	(See VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE [SKYACTIV-G 2.5T].)
	HLA	(See HYDRAULIC LASH ADJUSTER, ROCKER ARM [SKYACTIV-G 2.5T].)
	Camshaft	(See CAMSHAFT [SKYACTIV-G 2.5T].)
Timing chain		(See TIMING CHAIN, CHAIN TENSIONER [SKYACTIV-G 2.5T].)
Variable valve timing mechanism (See VARIABLE VALVE TIMING MECHANISM [SKYACTIV-G 2.5T].)	OCV	(See OIL CONTROL VALVE (OCV) [SKYACTIV-G 2.5T].)
	Hydraulic variable valve timing actuator	(See HYDRAULIC VARIABLE VALVE TIMING ACTUATOR [SKYACTIV-G 2.5T].)
	Electric variable valve timing actuator	(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR [SKYACTIV-G 2.5T].)
Electric variable valve timing relay		(See ELECTRIC VARIABLE VALVE TIMING RELAY [SKYACTIV-G 2.5T].)
Balancer unit		(See BALANCER UNIT [SKYACTIV-G 2.5T].)
Engine mount		(See ENGINE MOUNT [SKYACTIV-G 2.5T].)