2AR-FE engine has been put into production in 2008. It has replaced the 2.4-liter 2AZ-FE. The 2AR cylinder block has straight-4 configuration, it is made of aluminum. Inside, there are thin cast-iron sleeves. The crankshaft has 8 counterweights; it is mounted with 10 mm shift to the intake side. It drives the two balancer shafts. 2AR uses lightweight pistons with floating pins.
On the top of 3 layer steel head gasket, aluminum DOHC cylinder head is installed. This head is equipped with the hydraulic lifters. It also uses a variable valve timing system (Dual-VVTi). Adjustment range: intake – 50°, exhaust – 40°. The camshafts are driven by a single-row timing chain.
The intake system uses a 2-stage variable length intake manifold ACIS. The exhaust system uses a stainless header.
2AR-FSE engine version has also been produced. It is distinguished by the different pistons (compression ratio of 13) and a modified cylinder head. This engine features direct fuel injection system D4-S, as well as new camshafts, and other ECU.
For hybrid Toyota and Lexus models, the 2AR-FXE engine was being produced. This engine works on Atkinson cycle and is equipped with a modified pistons (compression ratio of 12.5).
On the basis of 2AR, 2.7 liter 1AR-FE engine was also being produced.
The engine is installed in :Toyota Avalon