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Toyota NZ engine
From Wikipedia, the free encyclopedia
The Toyota NZ engine family is a straight-4 piston engine series. The 1NZ series uses aluminum engine blocks and DOHC cylinder heads. It also uses SFI fuel injection, and has 4 valves per cylinder with VVT-i.
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The 1NZ-FXE is the earliest 1.5 L (1496 cm³) version built in Japan. Bore is 75 mm and stroke is 84.7 mm. It features forged steel connecting rods and a plastic composite intake manifold. The engine has a high physical compression ratio of 13.0:1, but the inlet valve closing is retarded. The net result is that the engine has a greater effective expansion than compression – making it Atkinson cycle, rather than the conventional Otto cycle.
The reduction in cylinder charge means reduced torque and power output, but efficiency is increased. This combination makes the 1NZ-FXE suitable for use with the Hybrid Synergy Drive, where peak torque and power demands can be met by the electric motor and battery. Output is 57 kW (76 hp) at 5000 rpm with 115 Nm (85 ft·lbf) of torque at 4000 rpm.
Applications:
The 1NZ-FXE Hybrid Synergy Drive in the Toyota Prius has won several International Engine of the Year awards:
- Best Eco-friendly 2000
- Best Eco-friendly 2001
- Best New Engine 2004
- Best Fuel Economy 2004
- Best 1.4-litre to 1.8-litre 2004
- International Engine of the Year 2004
- Best Fuel Economy 2005
- Best 1.4-litre to 1.8-litre 2005
- Best Fuel Economy 2006
- Best 1.4-litre to 1.8-litre 2006
The 1NZ-FE is a 1.5 L (1500 cm³) conventional Otto cycle variant of the 1NZ-FXE. It has the same bore and stroke, but the compression ratio is lowered to 10.5:1, and it features VVT-i. Output is 80 kW (107 hp) at 6000 rpm with 140 Nm (103 ft·lbf) of torque at 4200 rpm.
Applications:
The 2NZ-FE is a 1.3 L (1298 cm³) version built in Japan. Bore is 75 mm and stroke is 73.5 mm, with a compression ratio of 10.5:1. Output is 63 kW (85 hp) at 6000 rpm with 121 Nm (89 ft·lbf) of torque at 4400 rpm. The 2NZ-FEs that come in the Yaris sedan don't come equipped with VVT-i, but the ones in the Yaris Hatchback do. The VVT-i does not change the horsepower output, but rather alters with the valve timing according to driving conditions.
Applications: