ENGINE [SKYACTIV-G 2.5]

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2014 - Mazda6 - Engine

ENGINE [SKYACTIV-G 2.5]

Special Features

For SKYACTIV-G 2.5, the following is performed to lower fuel consumption.

Improvement of mechanical resistance loss

Narrowed down crankshaft journal

Optimized piston skirt shape

Lowered piston ring tension

Roller follower adopted

Reduction of valve spring load

Stabilization of timing chain behavior

Optimized engine coolant passage

Optimized water pump impeller shape

Lowered drive belt tension

Optimized oil passage

Optimized oil pump shape

Oil pump discharging pressure control has been adopted.

Improvement of pumping loss

Variable valve timing mechanism has been adopted on both sides of intake and exhaust.

L-jetronic^*1 and D-jetronic^*2 type detectors have been combined for intake air amount detection, improving the accuracy of the intake air amount measurement.

MAF sensor adopted

MAP sensor adopted

IAT sensor No.1 and No.2 adopted

Valve timing control has been adopted on both sides of the intake and exhaust, improving fuel economy and emission performance.

Intake side: Electric variable valve timing control

Intake CMP sensor adopted

Electric variable valve timing motor/driver adopted

Electric variable valve timing relay adopted

Exhaust side: Hydraulic variable valve timing control

Exhaust CMP sensor adopted

Engine oil control has been adopted reducing engine load.

Engine oil solenoid valve adopted

With the adoption of fuel pump control, fuel pump power consumption has been reduced, improving fuel economy.

Fuel pump control module adopted

Generator output control adopted, fuel economy/idling stability improved.

Current sensor adopted (with i-ELOOP)

With the adoption of the ion sensor, which detects pre-ignition, engine reliability has been improved.

LIN communication has been adopted to the current sensor and DC-DC converter for simplified wiring harnesses.

With the adoption of the i-ELOOP, charging efficiency during deceleration is improved. Because loss of engine force does not occur when the battery is recharged during deceleration, fuel economy is improved.

^*1: Measures the intake air amount directly using the MAF sensor.
^*2: Measures the intake air pressure introduced into the cylinder using the MAP sensor and calculates the intake air amount indirectly.

Specification


Item					Specification
MECHANICAL
Type					Gasoline, 4–cycle
Cylinder arrangement and number					In-line, 4–cylinder
Combustion chamber					Pentroof
Valve system					DOHC, timing chain driven, 16 valves
Displacement		(ml {cc, cu in})			2,488 {2,488, 151.8}
Bore × stroke		(mm {in})			89.0 × 100 {3.50 ×3.94}
Compression ratio					13.0:1
Compression pressure			(kPa {kgf/cm², psi} [rpm])		954 {9.73, 138} [300]
Valve timing		IN	Open	(°)	BTDC 42—ATDC 32
		IN	Closed	(°)	ABDC 36—ABDC 110
		EX	Open	(°)	BBDC 58—BBDC 13
		EX	Closed	(°)	ATDC 6—ATDC 51
LUBRICATION SYSTEM
Type					Force-fed type
Oil pressure (reference value) [Water temperature 80―90 °C {176―194°F}]				(kPa {kgf/cm², psi} [rpm])	Low oil pressure: 110―175 {1.13―1.78, 16.0―25.3}[1,500] High oil pressure: 300―430 {3.06―4.38, 43.6―62.3}[4,500]
Oil pump	Type				Trochoid gear type
Oil filter	Type				Full-flow, paper element
Oil filter	Bypass pressure		(kPa {kgf/cm², psi})		78—118 {0.80—1.20, 12.0—17.1}
Oil capacity (approx. quantity)	Total (dry engine)		(L {US qt, lmp qt})		5.4 {5.7, 4.8}
	Oil replacement		(L {US qt, lmp qt})		4.3 {4.5, 3.8}
	Oil and oil filter replacement		(L {US qt, lmp qt})		4.5 {4.8, 4.0}
COOLING SYSTEM
Type					Water-cooled, Electromotive
Coolant capacity (approx. quantity)			(L {US qt, lmp qt})		MTX : 7.5 {7.9, 6.6} ATX : 7.7 {8.1, 6.8}
Water pump		Type			Centrifugal, V-belt-driven
Thermostat		Type			Wax type
		Opening temperature		(°C {°F})	80.5―83.5 {177―182}
		Full-open temperature		(°C {°F})	95 {203}
		Full-open lift		(mm {in})	8.5 {0.33} or more
Radiator		Type			Corrugated fin type
Cooling system cap		Valve opening pressure		(kPa {kgf/cm², psi})	93.2―122.6 {0.951―1.250, 13.6―17.7}
Cooling fan		Type			Electric type
		Number of blades			Cooling fan No.1: 9 Cooling fan No.2: 11
		Outer diameter		(mm {in})	320 {12.6}
		Cooling fan motor output		(W)	Cooling fan No.1: 80 Cooling fan No.2: 120
FUEL SYSTEM
Fuel injector			Type		High resistance
			Fuel supply method		Top-feed
			Drive types		Electronic type
Pressure regulator control pressure			(kPa {kgf/cm², psi})		Approx. 430 {4.38, 62.4}
Fuel pump		Type			Electric
Fuel tank		Capacity		(L {US gal, lmp gal})	62.0 {16.4, 13.6}
EMISSION SYSTEM
Catalyst		Type			WU-TWC (monolith) TWC (monolith)
EVAP control system		Type			Charcoal canister type
PCV system		Type			Closed type
CHARGING SYSTEM
Battery		Voltage		(V)	12
Battery		Type and capacity		(A·h/20HR)	55D23L (60), 75D23L (65), Q-85(65)
Generator		Output		(V-A)	12-100
Ignition system		Type			SEI
		Spark advance			Electronic
		Firing order			1—3—4—2 (all cylinders independent firing)
		Firing order
Spark plug		Type			PE01-18-110, PE02-18-110, PE5R-18-110, PE5S-18-110
STARTING SYSTEM
Starter		Type			Coaxial reduction
Starter		Output		(kW)	1.4
CONTROL SYSTEM
Neutral switch					ON/OFF
CPP switch					ON/OFF
MAF sensor					Hot film
IAT sensor					Cold resistor
MAP sensor					Sealant diaphragm
TP sensor					Hall element
APP sensor					Hall element
CKP sensor					MR element
CMP sensor					GMR element
ECT sensor					Thermistor
BARO sensor					Piezoelectric element
Fuel pressure sensor					Metal diaphragm
KS					Piezoelectric element
A/F sensor					Zirconium element
HO2S					Zirconia element
Fuel tank pressure sensor					Piezoelectric element

Engine oil specification


Item	U.S.A. and CANADA	Except U.S.A. and CANADA
Engine oil grade
Engine oil grade		API SM or ILSAC
Engine oil viscosity	0W-20	5W-30 (If SAE 5W-30 engine oil is not available, use SAE 5W-20 engine oil.)

Fuel type


Fuel	Octane Rating^* (Anti-knock index)
Regular unleaded fuel	87 [(R+M)/2 method] or above (91 RON or above)

*: U.S. federal law requires that octane ratings be posted on gasoline station pumps.

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