The Toyota MZ engine family is a pistonV6 engine series. The MZ series has an aluminium engine block and aluminium alloyDOHCcylinder heads. The cylinders are lined with cast iron, and is of a closed deck design. The engine is a 60 degree V6 design. It uses multi-port fuel injection, four valves per cylinder, a one-piece cast camshaft and a cast aluminiumintake manifold. The MZ family is a lightweight V6 engine of an all-aluminium design, using lighter weight parts than the heavier duty VZ block engines in an effort to lower production costs, decrease engine weight, and decrease reciprocating weight without sacrificing reliability. Toyota sought to enhance the drivability pattern of the engine at exactly 3000 rpm, since that was the typical engine speed for motors cruising on the highway. The result was less cylinder distortion coupled with the decreased weight of rotating assemblies, smoother operation at that engine speed, and increased engine efficiency. They feature cast aluminium pistons with an anti-friction resin coating and valve depressions that decrease the chance of valve-to-piston interference in case of timing belt failure on motors without VVT-i. They also use steel rings, smaller-diameter shot-peened rods, and a forged steelcrankshaft. This engine has been phased out in most markets, replaced by variants of the new GR series.
1MZ-FE
The 1MZ-FE is a dual overhead cam V6 engine. Bore and stroke is. Output is at 5200–5400 rpm with of torque at 4400 rpm. Horsepower ratings dropped after the Society of Automotive Engineers implemented a new power measurement system for vehicle engines, Toyota engines rated on 87 octane dropped the most, compared to the same engines used by Lexus rated on 91 octane. It has bucket tappets and was designed for good fuel economy without an overall performance trade-off. These engines are prone to oil gelling. Another name for the issue was "engine sludge". There was a class action lawsuit due to this problem. It is very important to the life of these engines that oil changes are done on a regular basis. The 1MZ-FE was on Ward's 10 Best Engines list for 1996. Applications:
Toyota Racing Development offered a bolt-on TRD supercharger kit for the MY1997–2000 Camry, MY1998–2000 Sienna and MY1999–2000 Solara. Power output was bumped to and of torque. The 1MZ-FE with VVT-i is used in the Avalon, Highlander, Sienna and Camry. Output is at 5800 rpm with of torque at 4400 rpm. Early versions of the VVT-i 1MZ used a dual throttle body, cast aluminum intake manifold, and EGR block off plates on the exhaust manifolds. Later versions used a drive-by-wire/electronic throttle control. Applications:
The 2MZ-FE is a engine replacing the 4VZ-FE as the worldwide 2.5 L V6. Bore and stroke is. Output is at 6000 rpm with torque of at 4600 rpm. Applications:
The 3MZ-FE is a version. Bore and stroke is. Output is with of torque in the Camry and with of torque in the Sienna and Highlander. It also features VVT-i, ETCS-i, PA6 plastic intake, and increased throttle body diameter over the 1MZ. The 3MZ uses a new flat-type knock sensor, which is a departure from the typical resonator type knock sensor used on the previous MZs. Previous MZs had poor knock control, or perhaps oversensitivity when detecting knock, and power loss up to may be realized due to erratic ignition timing when using an octane lower than 91. The new flat-type knock sensor is a completely different design and detects more frequencies than the traditional resonator type. This provides the ECU with more accurate data. A bolt goes through the center of the knock sensor, which then mates the sensor to the block on each bank. Applications:
