We are open and processing orders! However, due to COVID-19, some orders may be delayed. We appreciate your patience.

Discount Prices. Same Day Shipping. No Hassle Returns.

The Toyota NR and NZ Series Engines

The NZ Series

The NZ engine family is best known for its role in the Prius models from Toyota. The first-generation NZ utilizes aluminum engine blocks and aluminum dual overhead camshaft (DOHC) cylinder heads. It has four valves per cylinder and employs variable valve timing, intelligent (VVT-i). The 1NZ-FXE is a 1.5-liter engine built in Japan with forged steel connecting rods and an aluminum intake manifold. Its compression ratio is 13:1 with a delayed inlet valve closure, which simulates the Atkinson cycle, increasing efficiency and reducing torque output.

Unlike other high compression engines, the 1NZ-FXE is tuned specifically to improve fuel economy at the expense of power output, thus becoming a perfect candidate for the Hybrid Synergy Drive powertrain. This engine was introduced in 1999 and has won several awards since, including a series of International Engine of the Year awards from 2000 onwards. The 1NZ-FXE appears in the Prius and Prius c. The 1NZ-FE is the low-compression, 1.5-liter Otto cycle variant of the 1NZ-FXE with 107 horsepower and 103 lb-ft of torque. It appeared in the Yaris on which the Prius c was based. It has been replaced with the second-generation 2NZ-FE.



  • Firing Order: 1-3-4-2
  • Spark Plug Gap: 0.043 in

The NR Series

A compact straight-four engine series, the NR engines are 1.3-liter aluminum blocks with dual overhead cam (DOHC) cylinders and SFI fuel injection with four valves per cylinder utilizing variable valve timing (VVT-i) or dual VVT-i, depending on the application. Most NR engines are used in the European market, but some 1NR-FE engines appear in the Scion iQ in the U.S.