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.
1RZ
The 1RZ is a version built from 1989. Bore and stroke is . The original carburetted model in Japanese trim produces at 5,400 rpm and maximum torque of at 2,400 prm.
Applications: 1989–1993 Toyota HiAce
1RZ-E
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: 1989–2004 Toyota HiAce Van, Wagon 1998–2001 Toyota Hilux 2000–2004 Toyota Kijang/Revo/Venture
2RZ
The 2RZ is a version. Bore and stroke is ; a variety of combination of heads and fuel delivery systems were available.
2RZ-E
This is an SOHC engine with two valves per cylinder. Valve adjustment is by shim over bucket. Output is at 5,200 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: 1989–2004 Toyota HiAce (encompassing the RZH1xx series)
2RZ-FE
The 2RZ-FE, and 4RB1 or 4RB2 in China, is a version. Bore and stroke is . Compression ratio is 9.5:1. Output is at 5000 rpm with 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 version called the 4RB3 is also manufactured in China. This one has a bore and stroke of , while sharing the 2RZ's bore spacing.
Applications: 1995–2004 Toyota Tacoma 4x2 1998–2004 Toyota Hilux 1999-2006 ARO 24 Series
3RZ
3RZ-FE
The 3RZ-FE is a version. Bore and stroke is . Compression ratio is 9.5:1. Output is at 4800 rpm with 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: 1995–2004 Toyota Tacoma 1996–2000 Toyota 4Runner 1994–1998 Toyota T100 1995–2002 Granvia 1995–2004 Toyota Hilux 1990–2004 Toyota HiAce 2001–2009 Toyota Land Cruiser Prado (Venezuela) 1996–2004 Toyota Land Cruiser Prado 1998–2002 Toyota Touring Hiace