The Toyota JZ engine family is a series of inline-6 automobile engines produced by Toyota. As a replacement for the M-series inline-6 engines, the JZ engines were 24-valve DOHC engines in 2.5- and 3.0-litre versions.

1JZ

The 1JZ version was produced from 1990 to 2007 (last sold in the Mark II Blit Wagon and Crown Athlete). Cylinder bore and stroke is . It is a 24-valve DOHC engine with two belt-driven camshafts and a dual-stage intake manifold.

1JZ-GE

thumb|1996 Toyota Mark II Grande G (X90) shown with a 1JZ-GE (non VVT-i)

thumb|1JZ-GE [[VVT-i in a Toyota Mark II (X100)]]

The 1JZ-GE is a common version, with a 10:1 compression ratio, weighing . Output for the early non-turbo, non-VVT-i (1990–1996) 1JZ-GE was at 6000 rpm and at 4800 rpm. VVT-i variable valve timing was added in 1995, for an output of at 6000 rpm and at 4000 rpm.

Like all JZ-series engines, the early 1JZ-GE is designed for longitudinal mounting and rear-wheel-drive. All cars equipped with the 1JZ-GE only came with a 4-speed automatic transmission; no manual gearbox option was offered. This included a reworked head, newly developed continuously variable valve timing mechanism (VVT-i), modified water jackets for improved cylinder cooling and newly developed shims with a titanium nitride coating for reduced cam friction. The turbo setup changed from parallel twin turbo (CT12A x2) to a single turbo (CT15B). The single turbo is in part made more efficient by the use of smaller exhaust ports in the head, this allows the escaping exhaust gasses to have more velocity as they exit the head, which in turn, spools the turbo faster and at lower RPM.The adoption of VVT-i and the improved cylinder cooling allowed the compression ratio to be increased from 8.5:1 to 9.0:1. The official power figures remained at at 6200 rpm, the torque was increased by to at 2400 rpm. These improvements resulted in increased engine efficiency that reduced fuel consumption by 10%. The adoption of VVTi, a higher efficiency single turbocharger as well as different manifold and exhaust ports were responsible for most of the 50% torque increase at low engine speeds. This engine was used primarily in Toyota's X chassis cars (Chaser, Mark II, Cresta, Verossa, Blit), the Crown Athlete V (JZS171) and in the later JZZ30 Soarer.

Applications:

  • Toyota Chaser/Cresta/Mark II 2.5GT Twin Turbo (JZX81)
  • Toyota Chaser/Cresta/Mark II Tourer V/Roulant G (JZX90, JZX100)
  • Toyota Mark II iR-V (JZX110)
  • Toyota Mark II Blit iR-V (JZX110W)
  • Toyota Soarer 2.5 GT-T(JZZ30)
  • Toyota Supra MK III 2.5 Twin Turbo (R) (JZA70)
  • Toyota Verossa VR25 (JZX110)
  • Toyota Crown Athlete V (JZS171 sedan and JZS171W wagon)

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1JZ-FSE

Around 2000, Toyota introduced the FSE direct injection variants. These FSE 1JZ and 2JZ engines are aimed at achieving minimal emissions and fuel consumption together with no loss of performance.

The 2.5-litre 1JZ-FSE employs the same block as the conventional 1JZ-GE; however, the design of the cylinder head is unique.

The ‘D4’ FSE employs a relatively narrow angle cylinder head with swirl control valves that serve to improve combustion efficiency.

This is necessary to run at extremely lean air-fuel ratios around 20 to 40:1 at certain engine load and revs. Not surprisingly, fuel consumption is reduced by around 20 percent (when tested in the Japanese 10/15 urban mode). Normal unleaded fuel is enough to cope with the FSE's 11:1 compression ratio.

The direct injection version of the 1JZ generates and – virtually the same as the conventional VVT-i 1JZ-GE. The 1JZ-FSE is always used with an automatic transmission.

Applications:

  • Mark II
  • Mark II Blit
  • Brevis
  • Progres
  • Verossa
  • Crown

The export version of the 2JZ-GTE achieved its higher power output with the use of newer stainless steel turbochargers (ceramic for Japanese models), revised camshafts, and larger injectors (550 cc/min for export, 440 cc/min for Japanese). The mechanical similarities between the Japanese-specification CT20 turbine and export-specification CT12B turbine allow interchangeability of the exhaust-side propeller shaft. Additionally, the export-exclusive CT12B turbine received more durable turbine housings and stainless steel turbine and impeller fins. Multiple variants of the Japanese CT20 turbine exist discretely, which are identified with the B, R, and A part number suffixes (e.g.: CT20A).

For all road car applications, two gearboxes were available for the engine:

  • Toyota A340E 4-speed automatic
  • Toyota V160 and V161 6-speed manual (jointly developed with Getrag as the Type 233)

Applications:

  • Toyota Aristo 3.0V JZS147 (Japan-only)
  • Toyota Aristo V300 JZS161 (Japan-only)
  • Toyota Supra RZ/Turbo JZA80

2JZ-FSE

Around 2000, Toyota introduced the FSE direct injection variants. These FSE 1JZ and 2JZ engines are aimed at achieving minimal emissions and fuel consumption together with no loss of performance.

The 3.0-litre 2JZ-FSE uses the same direct injection principle as the smaller 1JZ-FSE but runs an even higher 11.3:1 compression ratio. This engine features narrow angle cylinder heads with swirl control valves improving combustion efficiency (similar to the 1JZ-FSE) and weighs about . The 2JZ-FSE matches the conventional VVT-i 2JZ-GE with and of torque. The 2JZ-FSE is always used with an automatic transmission.

Applications:

  • Toyota Brevis
  • Toyota Progrès
  • Toyota Crown (S170)
  • Toyota Crown Majesta (S170)

See also

  • List of Toyota engines

References

  • AutoSpeed's Toyota JZ engine guide