Toyota AR engine
Encyclopedia
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
, and Camry
.
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 convertors 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 shaft
s in the shaft housing within the lower crankcase
.
The AR engine replaces the AZ engine
.
and Highlander
in late 2008.
Applications:
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.
The engine service mass is 324 lb (147 kg) that includes the oil and coolant fully filled.
Applications:
, Inc. (TMMAL) will start building the AR 2.5L and 2.7L engines beginning in mid 2011.
Straight-4
The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....
piston engine series by Toyota, first introduced in 2008 for the RAV4
Toyota RAV4
The Toyota RAV4 is a compact crossover SUV from Toyota. It was the first compact crossover SUV, introduced in Japan and Europe in 1994 and beginning sales in North America in 1996...
, and subsequently for the Highlander
Toyota Highlander
The Toyota Highlander is a midsize crossover SUV produced by Toyota. It is a taller, heavier version of the Toyota Camry.Announced in April 2000 at the New York Auto Show and arriving in late 2000 in Japan and January, 2001, in North America, the Highlander became the first car-based midsize SUV or...
, Venza
Toyota Venza
The Toyota Venza is a mid-size crossover SUV produced by Japanese automaker Toyota and unveiled at the 2008 North American International Auto Show in Detroit...
, and Camry
Toyota Camry
The Toyota Camry is a series of mid-size automobiles manufactured by Toyota since 1982, and sold in the majority of automotive markets throughout the world...
.
The AR series uses a die-cast
Die casting
Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process...
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
Variable valve timing
In internal combustion engines, variable valve timing , also known as Variable valve actuation , is a generalized term used to describe any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine...
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 convertors 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 shaft
Balance shaft
In piston engine engineering, a balance shaft is an eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced...
s in the shaft housing within the lower crankcase
Crankcase
In an internal combustion engine of the reciprocating type, the crankcase is the housing for the crankshaft. The enclosure forms the largest cavity in the engine and is located below the cylinder, which in a multicylinder engine are usually integrated into one or several cylinder blocks...
.
The AR engine replaces the AZ engine
Toyota AZ engine
The Toyota AZ engine family is a straight-4 piston engine series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder heads. The engine series features many advanced technologies including slant-squish combustion chambers,offset cylinder and...
.
1AR-FE
A 2.7 L version of the AR family, first released in the VenzaToyota Venza
The Toyota Venza is a mid-size crossover SUV produced by Japanese automaker Toyota and unveiled at the 2008 North American International Auto Show in Detroit...
and Highlander
Toyota Highlander
The Toyota Highlander is a midsize crossover SUV produced by Toyota. It is a taller, heavier version of the Toyota Camry.Announced in April 2000 at the New York Auto Show and arriving in late 2000 in Japan and January, 2001, in North America, the Highlander became the first car-based midsize SUV or...
in late 2008.
Applications:
- Toyota VenzaToyota VenzaThe Toyota Venza is a mid-size crossover SUV produced by Japanese automaker Toyota and unveiled at the 2008 North American International Auto Show in Detroit...
AGV10/15, 185 PS@5800, 247 N·m (182 ft·lbf)@4200 - Toyota Highlander ASU40, 190 PS@5800, 252 N·m (186 ft·lbf)@4100
- Toyota SiennaToyota SiennaThe Toyota Sienna is a family minivan currently manufactured by Toyota at Toyota Motor Manufacturing Indiana in Princeton, Indiana, United States for the North American market. It replaced the first-generation Previa van in 1997 with a more conventional front wheel drive layout and shares a heavily...
ASU40, 190 PS@5800, 252 N·m (186 ft·lbf)@4100
2AR-FE
A 2.5 L version of the AR family, first released in the RAV4Toyota RAV4
The Toyota RAV4 is a compact crossover SUV from Toyota. It was the first compact crossover SUV, introduced in Japan and Europe in 1994 and beginning sales in North America in 1996...
in the U.S. and Canada in 2008. This engine also replaced the 2AZ-FE
Toyota AZ engine
The Toyota AZ engine family is a straight-4 piston engine series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder heads. The engine series features many advanced technologies including slant-squish combustion chambers,offset cylinder and...
in the U.S. and Canada Camry in early 2009.
The engine service mass is 324 lb (147 kg) that includes the oil and coolant fully filled.
Applications:
- Toyota RAV4 (ASA33/38), 181 PS@6000, 233 N·m (172 ft·lbf)@4000
- Toyota Camry ASV40 (Base & LE), 171 PS@6000, 226 N·m (167 ft·lbf)@4100
- Toyota Camry ASV40 (SE), 181 PS@6000, 232 N·m (171 ft·lbf)@4100
- Scion tCScion tCThe Scion tC is an automobile manufactured and sold by Scion, a division of Toyota. Introduced in the United States in June 2004 and Canada in 2010. The name tC does not fit in with its stablemates the xA, xB, and xD, because the name XC designation has already been used by Volvo for its lineup of...
(ANT20), 180 hp, 173 lbft
Production
Toyota Motor Manufacturing AlabamaToyota Motor Manufacturing Alabama
Toyota Motor Manufacturing, Alabama, Inc. is a truck engine factory near Huntsville, Alabama, United States. It is owned and operated by Toyota Motor Corporation of Japan...
, Inc. (TMMAL) will start building the AR 2.5L and 2.7L engines beginning in mid 2011.