Toyota NZ engine

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NZ engine
DesignerYasushi Nouno, Hiroshi Tada, Toshifumi Takaoka[4]
Production1NZ-FXE: from December 1997[1]
1NZ-FE: from July 1999[2]
2NZ-FE: from October 1999[3]
ConfigurationNaturally aspirated Straight-4
Block materialAluminum
Head materialAluminum
Fuel typePetrol
Cooling systemWater-cooled
Power output74–109 hp (55–81 kW; 75–111 PS)
Torque output111–141 N⋅m (82–104 lb⋅ft)

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 sequential fuel injection, and has 4 valves per cylinder with VVT-i.

The engines are produced by Toyota's Kamigo Plant in Toyota, Aichi, Japan (1NZ for Prius, NZ for Vitz and ist, and R1NZ for Sienta);[2] by Siam Toyota Manufacturing in Chonburi, Thailand (NZ for NBC cars such as the 1NZ-FE for the Yaris and Vios);[5][6] and by Indus Motor Company in Karachi, Pakistan (2NZ for Corolla).[5]


1NZ-FXE and Electric Motor

The 1NZ-FXE is a hybrid 1.5 L (1,497 cc) version. Bore and stroke is 75 mm × 84.7 mm (2.95 in × 3.33 in). It features forged steel connecting rods and an aluminum intake manifold. The engine has a high physical compression ratio of 13.0:1, but the closing of the inlet valve is delayed, for an effective compression ratio of 9.5:1[7]. The net result is that the engine has a greater effective expansion than compression—making it a simulated Atkinson cycle, rather than a 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 76 hp (57 kW; 77 PS) at 5000 rpm with 115 N⋅m (85 lb⋅ft) of torque at 4000 rpm. Thermal efficiency is about 37%.[8] Production was discontinued in 2009, with the arrival of the Prius Gen 3, which replaced the 1NZ-FXE with the 2ZR-FXE.

In 2012, upon the arrival of the Prius c (North America), the Prius Aqua (Japan), and the Yaris Hybrid (Europe), an improved version was introduced. Without any belt-driven accessories, and a physical compression ratio of 13.4:1, the new version delivers an output of 74 hp (55 kW; 75 PS) at 4800 rpm with 111 N⋅m (82 lb⋅ft) of torque at 3600–4400 rpm.

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 Fuel Economy 2005
  • Best 1.4-litre to 1.8-litre 2005[9]
  • Best Fuel Economy 2006
  • Best 1.4-litre to 1.8-litre 2006[9]




The 1NZ-FE is a 1.5 L (1,497 cc) conventional Otto-cycle variant of the 1NZ-FXE with VVT-i. The engine block is found in many Toyota models assembled in Japan and Asian countries. It retains the same bore and stroke, but the compression ratio is lowered to 10.5:1. Output is 109 hp (81 kW; 111 PS) at 6000 rpm with 141 N⋅m (104 lb⋅ft) of torque at 4200 rpm. The redline is 6400 rpm.



The 2NZ-FE is a 1.3 L (1,298 cc) version. Bore and stroke is 75 mm × 73.5 mm (2.95 in × 2.89 in), with a compression ratio of 10.5:1. Output is 63 kW (84 hp; 86 PS) at 6000 rpm with 121 N⋅m (89 lb⋅ft) of torque at 4400 rpm. In 2000, it won the International Engine of the Year award in the 1-litre to 1.4-litre category.[10]


See also[edit]


  1. ^ "Technical Development: Engines". Toyota Motor Corporation. Archived from the original on January 1, 2001.
  2. ^ a b "General Status of Plants in Japan: Kamigo Plant". Toyota Motor Corporation. Archived from the original on August 2, 2013.
  3. ^ "Toyota Yaris Family Grows With New 1.3-Litre Versions". Toyota (GB). August 2, 1999. Archived from the original on October 22, 2015.
  4. ^ Itazaki, Hideshi (1999). The Prius That Shook The World. Tokyo: Nikkan Kogyo Shimbun. p. 147, 150, 160. ISBN 4-526-04376-1.
  5. ^ a b "Overview of Overseas Production Affiliates: Asia". Toyota Motor Corporation. Archived from the original on December 6, 2012.
  6. ^ "About STM". Siam Toyota Manufacturing. Archived from the original on February 19, 2014.
  7. ^ "Car and Driver 2004 Toyota Prius Specs" (PDF).
  8. ^ "Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hybrids". Green Car Congress. Retrieved 3 May 2015.
  9. ^ a b "Archive | International Engine of the Year". Engine Technology International magazine. Retrieved 10 February 2015.
  10. ^ "1-litre to 1.4-litre: Toyota 1.3-litre VVTi". Engine Technology International. UK & International Press. Archived from the original on July 19, 2001.

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