Production 2008- | Configuration Straight-4 4-cylinder | |
Predecessor Toyota AZ engineToyota S engine | ||
The AR engine family is a straight-4 piston engine series by Toyota, first introduced in 2008 for the RAV4, and subsequently for the Highlander, Venza, Camry and Scion tC.
Contents
The AR series uses a die-cast aluminium engine block and aluminium DOHC cylinder head. The engine series shares many of the technologies in the AZ engine, while incorporating new features such as variable valve timing on both intake and exhaust camshafts or dual VVT-i, low friction technologies including an offset crankshaft, roller rockers for the valvetrain, a three-stage variable oil pump, reduced-tension piston rings and auxiliary belt drive. An Acoustic Control Induction System switches the length of the intake tract in two stages, based on rpm and throttle angle, thereby ensuring strong torque across a broad engine speed range. New tumble control valves enhances combustion while the engine is cold, and helps to bring the catalytic converters up to working temperature quickly. The Tumble control valves, along with new 12-hole high atomizing long-nozzle fuel injectors, reduce the amount of fuel adhering to the intake ports and therefore maximize fuel economy and reduce harmful emissions.
The cylinder block is an open-deck, midi-skirt type with cast-in iron liners and a die-cast aluminium lower crankcase and a stamped oil pan. The forged steel crankshaft is fully balanced with eight counterweights and supported by five main bearings. A helical gear pressed in No. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase.
The AR engine replaces the AZ engine.
1AR-FE
A 2.7 L version of the AR family, first released in the Venza and Highlander in late 2008.
Applications:
2AR-FE
A 2.5 L version of the AR family, first released in the RAV4 in the U.S. and Canada in 2008. This engine also replaced the 2AZ-FE in the U.S. and Canada Camry in early 2009, giving 11% better fuel economy. The engine service mass is 324 lb (147 kg) that includes the oil and coolant fully filled. The engine is used in the U.S., Australia, New Zealand, China, Taiwan, Korea, Malaysia, Philippines, Thailand and Indonesia.
Applications:
2AR-FXE
The 2AR-FXE is an Atkinson cycle variant of the 2AR-FE. It has the same bore and stroke, but the cams and pistons are unique. Geometrical compression ratio is 12.5:1
The large valve overlap leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AR-FXE suitable for use in hybrid vehicles, where peak torque and power demands can be met by the electric motor and battery.
Maximum output when used in the Camry hybrid is 154 hp with 153 lb·ft of torque which doesn't include the additional power of the electric motor that is used in the Camry Hybrid.
Applications:
2AR-FSE
The 2AR-FSE is a variant of the 2AR-FE equipped with D4-S direct-injection and port injection. It has the same bore and stroke as other 2AR engines but the cylinder head, cams, pistons and fuel management system are unique. Thermal efficiency is about 38.5%. The expansion ratio is 13.0 to 1.
Output in the Toyota Crown hybrid is 178 hp (133 kW) at 6000 rpm and 221 N·m (163 lbf·ft) at 4200–4800 rpm.
Applications:
6AR-FSE
The 6AR-FSE is a 4-cylinder, 1998 cc, twincam, petrol engine equipped with D4-S direct fuel injection and VVT-iW. It can work in the Otto cycle and a modified-Atkinson cycle depending on output power. It was first introduced in the Camry in December 2014 for the Chinese market and March 2015 for the Thai market. The output of 6AR-FSE is 123 kW (165 bhp) at 6500 RPM and 199 N·m (147 lbf·ft) at 4600 RPM. The stroke and bore are 86 mm × 86 mm.
Applications:
8AR-FTS
A 2.0 L turbocharged direct-injected member the AR family, fitted with VVT-iW it is able to operate in both the Otto and a modified-Atkinson cycle. First debuted in the Lexus NX200t. Power output in the 2015 NX200t is 175 kW (235 hp) at 4,800 - 5,600 rpm and 350 N·m (258 lb·ft) at 1,650 - 4000 rpm. The 8AR-FTS engine had Lexus’ ESTEC D-4ST (Economy with Superior Thermal Efficient Combustion Direct injection 4-stroke with Turbo) fuel injection. With separate twin injectors for both direct and port injection, ESTEC D-4ST could perform high-pressure direct injection into the cylinder and conventional intake port injection, or direct cylinder injection only, according to engine speed. Power output in some applications, e.g. Lexus IS 200t XE30, Lexus GS 200t and Lexus RC 200t is bumped up by 5 kW in the same rev range but torque remains the same.
Applications:
Production
In Japan built by Toyota Motor Corporation in Kamigo Plant and by Toyota Industries Corporation Toyota Motor Manufacturing Alabama, Inc. (TMMAL) started building the AR 2.5L and 2.7L engines beginning in mid-2011.
GAC Toyota Engine Co.,Ltd Guangqi, China, announced start of AR 2.5L and 2.7L engine production November 2011
Toyota Australia officially opened its new engine plant producing both petrol and hybrid engine variants in Melbourne.