Toyota MZ engine
| Toyota MZ engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Toyota Motor Corporation |
| Production | 1993–2014 |
| Combustion chamber | |
| Configuration | V6 |
| Chronology | |
| Predecessor | Toyota VZ engine |
| Successor | Toyota GR engine |
The Toyota MZ engine family is a V6 piston engine series. The MZ series has an aluminium engine block and aluminium alloy DOHC cylinder heads. The cylinders are lined with cast iron, and is of a closed deck design (no open space between the bores). The engine is a 60 degree V6 design. It uses multiport fuel injection (MFI), four valves per cylinder, a one-piece cast camshaft and a cast aluminium intake 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 (over the 3VZ) 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 (moly) 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 steel crankshaft.
This engine has been phased out in most markets, replaced by variants of the new GR series.
The 1MZ-FE is a 3.0 L (2994 cc) dual overhead cam (DOHC) V6 engine. Bore is 87.5 mm and stroke is 83 mm. Output is 168–194 hp @ 5200–5400 rpm with 183–209 lb·ft 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.
...
Wikipedia