![]() ![]() Valve diameters are 34 mm (1.3 in) for intake and 29.5 mm (1.16 in) for exhaust, with 8 mm (0.31 in) lift for both intake and exhaust. As in the recent Toyota engine practice, no clearance adjusting shim is employed. The camshafts act on four valves per cylinder via bucket tappets. The dual overhead camshafts are driven by a single-stage roller chain of 8 mm (0.31 in) pitch, enabling a narrow included valve angle of 27.5°. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase. The forged steel crankshaft is fully balanced with eight counterweights and supported by five main bearings. The cylinder block is an open-deck, midi-skirt die-cast aluminium type with cast-in iron liners and a die-cast aluminium lower crankcase and a stamped oil pan. The engine series features many advanced technologies including slant- squish combustion chambers, offset cylinder and crank centers, and the VVT-i continuously variable intake valve timing system. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder head. The Toyota AZ engine family is a straight-4 piston engine series. ![]()
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