The 2.4-liter inline-four Toyota 2AZ-FE 2.4L Engine belongs to the AZ-series and is produced from 2000. The 2AZ engine is bigger displacement version of the 1AZ engine from the same engine family. The main idea of the 2AZ was replacing the old 5s engine.

Like 1AZ-FE, the 2AZ engine had an aluminum cylinder block with sleeves. The cylinder bore was increased to 88.5 mm, which required using bigger pistons compare to 1AZ pistons. For vibration reduction, there are two balancer shafts inside the crankcase. The engine has aluminum DOHC 16-valve cylinder head with variable valve timing system VVTi on the intake camshaft only. The 2AZ uses a timing chain to rotate camshafts. There are no hydraulic lifters. The adjustment of valve clearance is required every 60,000 miles (100,000 km). These two engines are almost identical expect the displacement.

In 2008 the engine was redesigned. 2008+ engine produces more power and torque. The compression ratio rose up from 9.6:1 to 9.8:1. The engine got new camshafts rising red line to 6,500 rpm. There are oil squirters for cooling pistons spraying oil on the bottom side of pistons. Engine output depends on the application: 161 hp (120 kW) for the Scion tC; 177 hp (132 kW) for the Rav4; 158 hp (118 kW) for the Camry, Corolla XRS, and Scion xB. In the same year, Toyota also released the 2AR which supposed to replace the 2AZ-FE from the production (but it is still available in some countries in our days).

Toyota 2AZ-FE 2.4L Engine  Specs