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The Toyota RZ engine family is a straight-four piston engine series built in Japan. The RZ series uses a cast-iron engine block and aluminum SOHCorDOHC cylinder heads. It has electronic fuel injection (EFI), 2 or 4 valves per cylinder and features forged steel connecting rods.
| Toyota RZ engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Toyota Motor Corporation |
| Production | 1989–2004 |
| Layout | |
| Configuration | Naturally aspirated Straight-4 |
| Cylinder bore |
|
| Piston stroke |
|
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminum |
| RPM range | |
| Max. engine speed | 5,500 |
| Combustion | |
| Fuel system | Electronic fuel injection |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 101–150 hp (75–112 kW; 102–152 PS) |
| Torque output | 118–177 lb⋅ft (160–240 N⋅m) |
| Chronology | |
| Predecessor |
|
| Successor | Toyota TR engine |
The 1RZ is a 2.0 L (1,998 cc) version built from 1989. Bore and stroke is 86 mm × 86 mm (3.39 in × 3.39 in). The original carburetted model in Japanese trim produces 100 PS (74 kW; 99 hp) at 5,400 rpm and maximum torque of 162 N⋅m (119 lb⋅ft) at 2,400 prm.
Applications:
The 1RZ-E is the fuel-injected version of the 1RZ. With a compression ratio of 9.0:1 and in Japanese trim, output is 110 PS (81 kW; 108 hp) at 5,200 rpm and maximum torque of 167 N⋅m (123 lb⋅ft) at 2,600 prm. With redline at 5,500 rpm.
Applications:
The 2RZ is a 2.4 L (2,438 cc) version. Bore and stroke is 95 mm × 86 mm (3.74 in × 3.39 in); a variety of combination of heads and fuel delivery systems were available.
This is an SOHC engine with two valves per cylinder. Valve adjustment is by shim over bucket. Output is 120 PS (88 kW; 118 hp) at 4800 rpm with 146 lb⋅ft (198N⋅m) of torque at 2600 rpm. Originally manufactured with a carburetor induction system, it was later upgraded to Electronic Fuel Injection, with the -E suffix added to the engine designation. Toyota specified unleaded fuel with a rating of at least 91 RON in Australia.
Applications:
The 2RZ-FE, and 4RB1or4RB2 in China, is a 2.4 L (2,438 cc) version. Bore and stroke is 95 mm × 86 mm (3.74 in × 3.39 in). Compression ratio is 9.5:1. Output is 142 hp (106 kW; 144 PS) at 5000 rpm with 160 lb⋅ft (217 N⋅m) of torque at 4000 rpm. This engine does not feature balance shafts. It has four valves per cylinder and DOHC. Valve adjustment is by shim over bucket. The 2RZ-FE is an interference engine with a timing chain. A 2.2 L (2,185 cc) version called the 4RB3 is also manufactured in China. This one has a bore and stroke of 91 mm × 84 mm (3.58 in × 3.31 in), while sharing the 2RZ's 102.5 mm (4.04 in) bore spacing.
Applications:
The 3RZ-FE is a 2.7 L (2,693 cc) version. Bore and stroke is 95 mm × 95 mm (3.74 in × 3.74 in). Compression ratio is 9.5:1. Output is 150 hp (112 kW; 152 PS) at 4800 rpm with 177 lb⋅ft (240 N⋅m) of torque at 4000 rpm. This engine features twin, chain-driven balance shafts. It has four valves per cylinder and DOHC. Valve adjustment is by shim over bucket. The 3RZ-FE is an interference engine with a timing chain.
Applications:
