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ENGINE [SKYACTIV-G 2.0]

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2016 – MX-5 – Engine

ENGINE [SKYACTIV-G 2.0]

Special Features

  • For SKYACTIV-G 2.0, the following has been implemented to lower fuel consumption.

    • Sliding resistance*1 reduction

      • Rocker arm (with built-in needle roller bearing) adopted for cam-contact area

      • Reduced valve spring load

      • Narrowed down crankshaft journal

      • Optimized piston skirt shape

      • Lowered piston ring tension

      • Lowered drive belt tension

      • Suppressed chain tensioner load by stabilized timing chain behavior

      • Oil shower pipe adopted

    • Mechanical resistance loss reduction

      • Optimized oil passage

      • Optimized oil pump shape

      • Engine oil control adopted

    • Cooling loss reduction in early stage of combustion

      • Piston cavity adopted

    • Pumping loss*2 reduction

      • Variable valve timing mechanism adopted on both intake and exhaust sides for fine control of exhaust amount and internal EGR volume

    • Cooling efficiency improvement

      • Air seal cowl adopted

      • Optimized cooling fan shape

      • Optimized engine coolant passage

      • Optimized water pump impeller shape

    • Combustion efficiency improvement

      • Multiple hole-type fuel injectors adopted

      • High-pressure fuel pump adopted

  • The HLA has been adopted to achieve the maintenance-free valve clearance.

  • The 4-2-1 type exhaust pipes have been adopted for the exhaust manifold to achieve an engine with a high compression ratio.

  • L-jetronic*3 and D-jetronic*4 types have been adopted for the intake air amount measurement to achieve stable combustion free from abnormal combustion.

    • MAF sensor adopted

    • MAP sensor adopted

    • IAT sensor No.1 and No.2 adopted

  • To improve the fuel economy and emission performance, an electric variable valve timing control has been adopted for the intake side, and a hydraulic variable valve timing control for the exhaust side. The electric type is adopted for the intake side to achieve expanded valve overlap and delayed closing of the intake valve (enlarged intake valve opening angle).

    • 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 hydraulic pressure switching control has been adopted to reduce the oil pump operation load on the engine.

    • Engine oil solenoid valve adopted

  • To improve engine reliability, an ion sensor has been adopted which detects pre-ignition.

*1
Resistance (friction force) which occurs when objects slide. The larger the sliding resistance, the greater the energy loss.
*2
Energy loss due to resistance in each part during intake/exhaust process is called pumping loss.
*3
The intake air amount is directly detected by measuring the amount of intake air flow using the MAF sensor.
*4
The intake air amount is detected indirectly by measuring the intake manifold pressure (pressure between downstream of the throttle valve and intake manifold) using the MAP sensor.

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 )

1,997.6 {1,997.6}

Bore × stroke

(mm )

83.5 × 91.2 {3.29 × 3.59}

Compression ratio

13.0:1

Valve timing

IN

Open

(°)

BTDC 42???ATDC 32

Close

(°)

ABDC 36???ABDC 110

EX

Open

(°)

BBDC 56???BBDC 11

Close

(°)

ATDC 5???ATDC 50

LUBRICATION SYSTEM

Type

Force-fed type

Oil pressure (reference value)

[Coolant temperature: 80???90 °C {176???194 °F}]

(kPa {kgf/cm2, psi} [rpm])

Lo: 110???175 {1.13???1.78, 16.0???25.3} [1,500]

Hi: 300???430 {3.06???4.38, 43.6???62.3} [4,500]

Oil pump

Type

Trochoid gear type

Oil filter

Type

Full-flow

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})

5.0 {5.3, 4.4}

Oil replacement

(L {US qt, lmp qt})

4.3 {4.5, 3.8}

Oil and oil filter replacement

(L {US qt, lmp qt})

4.1 {4.3, 3.6}

COOLING SYSTEM

Type

Water-cooled, Electromotive

Coolant capacity (approx. quantity)

(L {US qt, lmp qt})

AT: 5.9 {6.2, 5.2}

MT: 6.0 {6.3, 5.3}

Water pump

Type

Centrifugal, V-ribbed belt-driven

Thermostat

Type

Wax type

Opening temperature

(°C {°F})

86.5???89.5 {188???193}

Full-open temperature

(°C {°F})

95

Full-open lift

(mm )

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

Type

Electric type

Number of blades

9

Outer diameter

(mm )

335 {13.2}

Cooling fan motor output

(W)

AT: 160

MT: 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. 450 {4.59, 65.3}

Fuel pump

Type

Electric type

Fuel tank

Capacity

(L {US gal, lmp gal})

45.0 {11.9, 9.90}

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

Type and capacity

(A·h/20HR)

46B24L (45)

Generator

Output

(V-A)

12-100

IGNITION SYSTEM

Ignition system

Type

SEI

Spark advance

Electronic

Firing order

1???3???4???2 (all cylinders independent firing)

Spark plug

Type

PE5R-18-110

PE5S-18-110

STARTING SYSTEM

Starter

Type

Coaxial reduction

Output

(kW)

1.4

CONTROL SYSTEM

Neutral switch

ON/OFF type switch

CPP switch

ON/OFF type switch

MAF sensor

Hot film

IAT sensor No.1

Thermistor

IAT sensor No.2

Thermistor

MAP sensor

Piezoresistance

TP sensor

Hall element

APP sensor

Electromagnetic induction action applied to non-contact type

CKP sensor

Magnetic resistance element

Intake CMP sensor

Magnetic resistance element

Exhaust CMP sensor

Magnetic resistance element

ECT sensor

Thermistor

BARO sensor

Piezoelectric element

Fuel pressure sensor

Strain gauge

KS

Piezoelectric element

A/F sensor

Zirconium element

HO2S

Zirconia element

Oil pressure switch

ON/OFF type switch

Fuel tank pressure sensor

Piezoelectric element

Vacuum sensor 2

Piezoelectric element

Ion sensor

Ion detection circuit

    Compression pressure

Engine oil specification

Item

U.S.A., Canada and Puerto Rico

Except U.S.A., Canada and Puerto Rico

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

91 [(R+M)/2 method] or above (96 RON or above)

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

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