MECHANICAL [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

MECHANICAL [SKYACTIV-G 2.5]

Outline

The sliding resistance^*1 has been reduced by:

Adoption of a rocker arm (built into needle roller bearing)

Reducing load on the valve spring

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

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].)

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