MECHANICAL [SKYACTIV-G 2.5]

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Outline

• The sliding resistance^*1 has been reduced by:

― Adoption of a rocker arm (built in needle roller bearing)

― Reducing the valve spring load

― Narrowing down the crankshaft journal

― Optimizing the piston skirt shape

― Adoption of a low-tension piston ring

― Lowered tensioning of the drive belt

• A maintenance-free design for valve clearance has been achieved with the adoption of the HLA.

• With the adoption of a piston cavity, cooling loss has been reduced.

• The pumping loss^*2 has been reduced with the adoption of the variable valve timing mechanism on both sides of the intake and exhaust.

• The timing chain behavior has been stabilized and sliding resistance has been reduced by optimizing the shape and rigidity of the timing chain-related parts.

*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.

Structural View

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Structure

• Consists of the following parts:

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