Toyota MZ engine
 | This article needs additional citations for verification. (October 2017) |
| Toyota MZ engine | |
|---|---|
 1MZ-FE engine in a Toyota Windom | |
| Overview | |
| Manufacturer | Toyota Motor Corporation |
| Production | 1993–2014 |
| Layout | |
| Configuration | V6 |
| Displacement | 2.5 L (2,496 cc) 3.0 L (2,994 cc) 3.3 L (3,310 cc) |
| Cylinder bore | 87.5 mm (3.44 in) 92 mm (3.62 in) |
| Piston stroke | 83 mm (3.27 in) 69.2 mm (2.72 in) |
| Cylinder block material | Aluminium alloy |
| Cylinder head material | Aluminium alloy |
| Valvetrain | DOHC 4 valves x cyl. |
| Combustion | |
| Supercharger | TRD (some versions) |
| Fuel system | Multi-port fuel injection |
| Fuel type | Gasoline |
| Cooling system | Water cooled |
| Output | |
| Power output | 194–242 hp (145–180 kW; 197–245 PS) |
| Torque output | 180–242 lb⋅ft (244–328 N⋅m) |
| Chronology | |
| Predecessor | Toyota VZ engine |
| Successor | Toyota GR engine |
The Toyota MZ engine family is a piston V6 engine series. It was Toyota's second V6 engine after the VZ engine family, of which the MZ series succeeded it.
The MZ family is a lightweight V6 engine of an all-aluminium design, using lightweight parts than the previous heavy-duty VZ block engines in an effort to lower production costs and decrease engine and reciprocating weight without sacrificing reliability. Toyota sought to enhance the drivability pattern of the engine (over the 3VZ-FE) 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.[citation needed]
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 multi-port fuel injection (MFI), four valves per cylinder, a one-piece cast camshaft and a cast aluminium intake manifold.
This engine has been phased out in most markets, replaced by variants of the then-new GR series.
1MZ-FE
[edit]
The 1MZ-FE is a 3.0 L (2,994 cc) dual overhead cam (DOHC) V6 engine, replacing the 3VZ-FE as the worldwide 3.0 L V6 engine. Bore and stroke is 87.5 mm × 83 mm (3.44 in × 3.27 in). Output is 194–201 hp (145–150 kW; 197–204 PS) at 5200–5400 rpm with 183–209 lb⋅ft (248–283 N⋅m) of torque at 4400 rpm. Horsepower ratings dropped after the Society of Automotive Engineers (SAE) 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 of 19 mpg‑US (12 L/100 km; 23 mpg‑imp) city and 25 mpg‑US (9.4 L/100 km; 30 mpg‑imp) highway without an overall performance trade-off.
Toyota Racing Development offered a factory supported bolt-on supercharger kit for the MY1997–2000 Camry, MY1998–2000 Sienna and MY1999–2000 Solara. Power output was bumped to 242 hp (180 kW; 245 PS) and 242 lb⋅ft (328 N⋅m) of torque.
The 1MZ-FE was on Ward's 10 Best Engines list for 1996.[1]
Applications:
- 1993–2002 Toyota Camry (V6)
- 2002–2006 Toyota Camry (MCV36R) (Australian/New Zealand domestic market)
- 1993–2003 Lexus ES 300 & Toyota Windom (Japanese domestic market)
- 1994–2004 Toyota Avalon & 2000 Toyota Pronard (Avalon for Japanese domestic market)
- 1997-2003 Toyota Harrier (non-US markets)
- 1997–2002 Toyota Sienna
- 1997–2001 Toyota Mark II Wagon (Japanese domestic market)
- 1998–2003 Toyota Camry Solara (V6)
- 2000–2005 Toyota Estima/Toyota Tarago/Toyota Previa
Beginning in 1998, VVT-i was added. This increased the output to 210 hp (157 kW; 213 PS) at 5800 rpm and 222 lb⋅ft (301 N⋅m) of torque at 4400 rpm. It was used on later models of the Avalon, Sienna and Camry. Early versions of the 1MZ-FE with VVT-i used a dual throttle body while later versions used a drive by wire system (or electronic throttle control). It also contains an EGR block off plate on the exhaust manifolds.
Applications:
- 1998–2003 Lexus RX 300 (US market)
- 1999–2003 Lexus ES 300
- 2000–2004 Toyota Avalon
- 2000–2003 Toyota Highlander/Kluger
- 2001–2003 Toyota Sienna
- 2002–2008 Toyota Alphard (Japanese domestic market)
- 2003–2006 Toyota Camry (V6)
Excessive oil consumption issues
[edit]These engines are notorious for excess oil consumption, otherwise known as "oil gelling"[2] or "engine sludge".[3][4] The cause of this problem relates to several factors, such as the engine's PCV system, worn-off parts, or a bad or leaking head gasket. This allowed oil to leak into the engine bay, with symptoms ranging from blue-grey smoke, bad spark plugs and sludge buildup in cylinder bank 2, to low compression on the second cylinder. This affected many vehicles that used this engine in their configurations, especially in later models of the 1MZ engines. It is very important to the life of these engines that oil changes must done on a regular basis.[4] A class action lawsuit was filed because of this problem.[2] This particular issue remains a significant concern for 1MZ engines of that era.
2MZ-FE
[edit]
The 2MZ-FE is a 2.5 L (2,496 cc) V6 engine, replacing the 4VZ-FE as the worldwide 2.5 L V6 engine. Bore and stroke is 87.5 mm × 69.2 mm (3.44 in × 2.72 in). Output is 197 hp (147 kW; 200 PS) at 6000 rpm with torque of 180 lb⋅ft (244 N⋅m) at 4600 rpm.
Applications:
- 1996-2001 Toyota Camry (Japanese, NZ and some other Non-US markets)
- 1996-2001 Toyota Windom (Japanese domestic market)
- 1997–2001 Toyota Mark II Qualis (Japanese domestic market)
3MZ-FE
[edit]
The 3MZ-FE is a 3.3 L (3,310 cc) version. Bore and stroke is 92 mm × 83 mm (3.62 in × 3.27 in). Output is 225 hp (168 kW; 228 PS) with 240 lb⋅ft (325 N⋅m) of torque in the Camry and 230 hp (172 kW; 233 PS) with 242 lb⋅ft (328 N⋅m) of torque in the Sienna and Highlander. It also features VVT-i, ETCS-i (Electronic Throttle Control System — intelligent/DBW), 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 20 hp (15 kW) 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:
- 2004-2007 Toyota Highlander
- 2004–2008 Toyota Camry Solara (V6)
- 2004–2006 Toyota Sienna
- 2004–2006 Toyota Camry (XV30) (SE V6)
- 2005–2010 Toyota Highlander Hybrid (reduced power output)
- 2004–2006 Lexus RX 330
- 2006–2008 Lexus RX 400h (reduced power output)
- 2004–2006 Lexus ES 330
- 2006-2014 Mitsuoka Orochi
See also
[edit]
References
[edit]- ^ "Ward's 10 Best Engines Winners, 1995-2012". Wards Intelligence. Ward's. Jan 2012.
- ^ a b "Archived copy" (PDF). oilgelsettlement.com. Archived from the original (PDF) on 18 January 2007. Retrieved 12 January 2022.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ "The black death of sludge". Consumers Reports. Consumers union. February 2014. Retrieved September 12, 2016.
- ^ a b "What Is Engine Sludge and How It Can Destroy Your Vehicle?". Valvoline™ Global E. Retrieved 23 March 2025.