ENGINE UNIT


  1. OUTLINE


    1. The 2UR-GSE is a 5.0-liter, 32-valve DOHC V8 engine. The engine adopts the Dual Variable Valve Timing-intelligent (Dual VVT-i) system which realizes optimal valve timing by using electric motors to actuate the intake camshaft actuators and engine oil pressure to actuate the exhaust camshaft actuators. In addition, this engine uses the Direct injection 4-stroke gasoline engine Superior version (D-4S) which uses both the direct injection and port injection systems, Direct Ignition System (DIS), and Electronic Throttle Control System-intelligent (ETCS-i). These systems achieve improved engine performance, quietness, fuel economy, and clean emissions.

  2. SPECIFICATION

    Engine Type 2UR-GSE
    No. of Cyls. & Arrangement 8-cylinder, V-type
    Valve Mechanism 32-valve DOHC, Chain Drive (with Dual VVT-i)
    Combustion Chamber Pentroof Type
    Manifolds Cross-flow
    Fuel System Sequential Multiport Fuel Injection (SFI) D-4S
    Ignition System Direct Ignition System (DIS)
    Displacement

    cm3(cu. in.)

    		 4969 (303.2)
    Bore x Stroke mm (in.) 94.0 x 89.5 (3.70 x 3.52)
    Compression Ratio 12.3 : 1
    Max. Output [EC-NET] kW@rpm 351@7100
    Max. Torque [EC-NET] N*m@rpm 530@4800 to 5600
    Valve Timing Intake Open -24° to 32° BTDC
    Closed 100° to 44° ABDC
    Exhaust Open 37° to 67° BBDC
    Closed 27° to -3° ATDC
    Spark Plug Manufacturer DENSO
    Type FK20HBR-J8 (Iridium)
    Plug Gap mm (in.) 0.7 to 0.8 (0.0276 to 0.0315)
    Firing Order 1 - 8 - 7 - 3 - 6 - 5 - 4 - 2
    Research Octane Number 95 or higher*1
    Emission Regulation

    LEVIII-ULEV 70*2

    EURO V*3

    EURO VI*4

    *1: Premium unleaded gasoline with a Research Octane Number 95 or higher required for optimum engine performance. If 95 octane cannot be obtained, you may use unleaded gasoline with a Research Octane Number as low as 91. Use of unleaded fuel with a Research Octane Number lower than 95 may result in engine knocking and significantly reduced performance. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline.

    *2: Destination package for South Korea

    *3: Models for China

    *4: Models for Europe, Australia, G.C.C. countries and general countries

    Figure 1. Performance Curve

    B004H6AE01

  3. MAIN FEATURES


    1. The 2UR-GSE engine has achieved the following through the adoption of the items listed below:


      1. High performance and reliability

      2. Low noise and vibration

      3. Lightweight and compact design

      4. Good serviceability

      5. Clean emissions and fuel economy

        Item (1) (2) (3) (4) (5)
        Engine Proper Aluminum alloy cylinder head cover sub-assemblies are used. - - ○ - -
        Steel laminate type cylinder head gaskets are used. ○ - - - -
        A taper squish shape is used for the combustion chamber. ○ - - - ○
        An aluminum alloy cylinder block sub-assembly containing an engine coolant distribution pathway is used. ○ - ○ - -
        Spiny-type liners are used in the cylinder bores. ○ - - - -
        Cylinder block water jacket spacers are used. ○ - - - ○
        The skirt portion of the piston has a resin coating applied to reduce friction. ○ ○ - - ○
        A No. 2 oil pan sub-assembly made of aluminum alloy is used. - ○ ○ - -
        Valve Mechanism Timing chains and chain tensioners are used. ○ ○ ○ - -
        No. 1 valve rocker arm sub-assemblies are used. ○ - - - ○
        Fixed type valve rocker arm pivots are used. ○ - - - -
        Lubrication System An oil filter with a replaceable element is used. - - - ○ -
        A scavenging pump assembly is used. ○ - - - -
        Cooling System Toyota Genuine Super Long-Life Coolant (SLLC) is used. - - - ○ -
        A sealed type cooling system is used. ○ - - - -
        Intake and Exhaust Systems A linkless-type throttle body with motor assembly is used. - - ○ ○ -
        Stainless steel exhaust manifold sub-assemblies are used. ○ - ○ - ○
        Ceramic type Three-Way Catalyst converters (TWCs) are used. - - - - ○
        Fuel System A Direct injection 4-stroke gasoline engine Superior version (D-4S) system is used. ○ - - - ○
        Slit nozzle type high pressure fuel injector assemblies are used. ○ - - - ○
        Quick connectors are used to connect the fuel hoses with the fuel pipes. - - - ○ -
        Ignition System A Direct Ignition System (DIS) is used. ○ - ○ ○ ○
        Long-reach type iridium-tipped spark plugs are used. ○ - - ○ ○
        Charging System A segment conductor type generator assembly is used. ○ - ○ - -
        Serpentine Belt Drive System A serpentine belt drive system is used. - - ○ ○ -
        Blowby Gas Ventilation System A separator case is used. ○ - ○ ○ -
        Emission Control System An evaporative emission control system is used. - - - - ○
        Engine Control System Magneto-Resistance Element (MRE) type crank position sensor, cam position sensors and Variable Valve Timing (VVT) sensors are used. ○ - - - -
        An Electronic Throttle Control System-intelligent (ETCS-i) is used. ○ - - - ○
        A cranking hold function is used. ○ - - - -
        The Dual Variable Valve Timing-intelligent (Dual VVT-i) system is used. It consists of VVT-iE for the intake camshafts and VVT-i for the exhaust camshafts. ○ - - - ○

        Tech Tips

        ○: Applicable

        -: Not applicable

    2. The 2UR-GSE engine uses the Direct injection 4-stroke gasoline engine Superior version (D-4S) system to achieve high performance while also achieving fuel economy and clean emissions. The features of the D-4S system are as listed below:


      1. The D-4S system is a system which combines a direct injection system which injects fuel into the combustion chamber and a port injection system which injects fuel to the intake ports. This system optimally controls the 2 types of fuel injector assemblies in accordance with the driving conditions.

      2. When the engine is running under a medium or high load at lower speeds, both the direct and port injection systems are used. This control creates a homogeneous air-fuel mixture to stabilize combustion, improve fuel efficiency, and reduce emissions.

      3. When the engine is running under heavy load, the direct injection system is used. This achieves an intake cooling effect by injecting fuel directly to the combustion chamber. As a result of this cooling effect, the compression ratio of the engine can be made higher as the tendency of the compressed mixture to preignite or detonate is reduced. The increased compression ratio improves engine output and performance.

      4. When the engine is at maximum engine output, the fuel injector assemblies (for port injection) inject fuel into the intake ports to cool the ports and to ensure optimal fuel atomization timing, improving engine output performance.

      5. The slit nozzle type fuel injector assemblies (for direct injection) atomize fuel so that the fuel spreads out widely and finely in a fan shape. Fuel is mixed with intake air efficiently and homogeneously, enabling ideal combustion in all driving conditions.

      6. When the engine is cold, fuel is injected from the fuel injector assemblies (for port injection) to create a homogenous lean air-fuel mixture in the combustion chamber. Fuel is also injected from the fuel injector assemblies (for direct injection) during the latter half of the compression stroke to adjust the air-fuel mixture around the spark plug to allow stable combustion under retarded ignition timing, thus increasing exhaust gas temperature. This promotes rapid warming of the catalysts and achieves cleaner emissions.

        B004H31C01
        *1 Fuel Injector Assembly (for Direct Injection) *2 Fuel Injector Assembly (for Port Injection)
        *a Intake Port *b Combustion Chamber