![]() ![]() ![]() The remaining letters, following a hyphen, describe the engine's major features. The leading number denotes the generation, and the next one or two letters, specify the engine family. Toyota engine names are interpreted as follows. The ZZ family replaced the extremely popular cast-iron block 4A engines. The former was optimised for economy, with torque emphasised in lower revolutions per minute operating range, while the latter is a "square" design optimised for high-RPM torque, yielding higher peak power. ![]() The two 1.8 L members of the family, the 1ZZ and 2ZZ, use different bore and stroke. The ZZ series uses a die-cast aluminium engine block with thin press-fit cast iron cylinder liners, and aluminium DOHC 4-valve cylinder heads. The Toyota ZZ engine family is a straight-4 piston engine series. ![]()
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