Toyota AR engine
| Manufacturer | Toyota Motor Corporation |
|---|---|
| Production | 2008- |
| Predecessor | Toyota AZ engine Toyota S engine |
| Configuration | Straight-4 4-cylinder |
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
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 continuously 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
| Manufacturer | Toyota |
|---|---|
| Displacement | 2,672 cc (163.1 cu in) |
| Cylinder bore | 90 mm (3.543 in) |
| Piston stroke | 105 mm (4.134 in) |
| Cylinder block alloy | alloy |
| Cylinder head alloy | alloy |
| Valvetrain | DOHC |
| Compression ratio | 10.0 |
| Fuel system | EFI |
| Fuel type | petrol (gasoline) |
| Power output | 182–187 bhp (136–139 kW) |
| Torque output | 182–186 lb·ft (247–252 N·m) |
A 2.7 L version of the AR family, first released in the Venza[1] and Highlander in late 2008.[2]
Applications:
- Toyota Venza AGV10/15, 185 PS (136 kW; 182 hp)@5800, 247 N·m (182 lbf·ft)@4200
- Toyota Highlander ASU40, 190 PS (140 kW; 187 hp)@5800, 252 N·m (186 lbf·ft)@4100
- Toyota Sienna ASU40, 190 PS (140 kW; 187 hp)@5800, 252 N·m (186 lbf·ft)@4100
- Lexus RX AGL10, 138 kW (188 PS)@5800, 252 N·m (186 lbf·ft)@4200
2AR-FE
| Manufacturer | Toyota |
|---|---|
| Displacement | 2,494 cc (152.2 cu in) |
| Cylinder bore | 90 mm (3.543 in) |
| Piston stroke | 98 mm (3.858 in) |
| Cylinder block alloy | alloy |
| Cylinder head alloy | alloy |
| Valvetrain | DOHC |
| Compression ratio | 10.4 |
| Fuel system | EFI |
| Fuel type | petrol (gasoline) |
| Power output | 169–180 bhp (126–134 kW) |
| Torque output | 167–173 lb·ft (226–235 N·m) |
A 2.5 L version of the AR family, first released in the RAV4 in the U.S. and Canada in 2008.[3] This engine also replaced the 2AZ-FE in the U.S. and Canada Camry in early 2009, giving 11% better fuel economy.[4] 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,[5] New Zealand,[6] China, Taiwan, Korea, Malaysia, Thailand[7] and Indonesia.[8]
Applications:
- Toyota RAV4 (ASA33/38), 181 PS (133 kW; 179 hp)@6000, 233 N·m (172 lbf·ft)@4000
- Toyota Camry ASV40 (Base & LE), 171 PS (126 kW; 169 hp)@6000, 226 N·m (167 lbf·ft)@4100
- Toyota Camry ASV40 (SE), 181 PS (133 kW; 179 hp)@6000, 232 N·m (171 lbf·ft)@4100
- Scion tC (AGT20), 180 hp (130 kW), 173 lb·ft (235 N·m)
- 2011 Toyota Camry Hybrid AVV50
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.
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.
2AR-FSE
The 2AR-FSE is a direct-injected variant of the 2AR-FE. It has the same bore and stroke, but the cylinder head, cams and pistons are unique as well as the fuel management system.
Production
Toyota Motor Manufacturing Alabama, Inc. (TMMAL) will start building the AR 2.5L and 2.7L engines beginning in mid-2011.[9]
GAC Totota Engine Co.,Ltd Guangqi, China, announced start of AR 2.5L and 2.7L engine production November 2011[10]
References
- ^ Toyota USA 2008 (2009 US model year) Venza product information
- ^ Toyota USA 2008 (2009 US model year) Highlander product information
- ^ Toyota USA 2008 (2009 US model year) RAV4 press release
- ^ NZ Herald, Camry
- ^ Toyota Australia, Camry
- ^ Toyota New Zealand, Camry
- ^ Toyota Thailand, Camry
- ^ Wikipedia Japan, Toyota Camry
- ^ TMC's Alabama, U.S.A. Plant to Build 4-cylinder Engines
- ^ Toyota Press release: Production of new engines starts
