| Toyota RZ engine | |
| Manufacturer: | Toyota Motor Corporation |
| Production: | 1989–2004 |
| Successor: | Toyota TR engine |
| Block: | Cast iron |
| Head: | Aluminum |
| Configuration: | Naturally aspirated Straight-4 |
| Fueltype: | Gasoline |
| Fuelsystem: | Electronic fuel injection |
| Coolingsystem: | Water-cooled |
| Redline: | 5,500 |
| Power: | 101- |
| Torque: | 118- |
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 SOHC or DOHC cylinder heads. It has electronic fuel injection (EFI), 2 or 4 valves per cylinder and features forged steel connecting rods.
The 1RZ is a 1998cc version built from 1989. Bore and stroke is NaNmm. The original carburetted model in Japanese trim produces at 5,400 rpm and maximum torque of 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 at 5,200 rpm and maximum torque of at 2,600 prm. With redline at 5,500 rpm.
Applications:
The 2RZ is a 2438cc version. Bore and stroke is NaNmm; 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 1200NaN0 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 4RB1 or 4RB2 in China, is a 2438cc version. Bore and stroke is NaNmm. Compression ratio is 9.5:1. Output is 142hp at 5000 rpm with 160lbft 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 2185cc version called the 4RB3 is also manufactured in China. This one has a bore and stroke of 91x, while sharing the 2RZ's 102.5mm bore spacing.
Applications:
The 3RZ-FE is a 2693cc version. Bore and stroke is NaNmm. Compression ratio is 9.5:1. Output is 1500NaN0 at 4800 rpm with 177lbft 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: