Toyota AZ engine

The Toyota AZ engine is a family of straight-four piston engines. It uses an aluminium block with cast iron cylinder liners and an aluminium DOHC cylinder head, with advanced features including slant-squish combustion chambers, offset cylinder and crank centres and the VVT-i continuously variable intake valve timing system. The engine measures 626 millimetres long, 608 wide and 681 tall. The cylinder block is an open-deck, midi-skirt die-cast aluminium type, and the forged steel crankshaft has eight counterweights and drives twin contra-rotating balance shafts. The camshafts are driven by a single-stage roller chain and act on four valves per cylinder with a narrow included valve angle of 27.5 degrees, and the valve cover is made of magnesium to save weight. The AZ is the replacement for the S engine, and its successor is the AR engine. The 2AZ-FE in certain Camry, RAV4 and Corolla models may burn excessive oil, and Toyota offered warranty extensions under a lawsuit settlement, a campaign that ended on 31 October 2016. In the Transport Atlas it represents the mainstream Toyota four-cylinder of the 2000s.