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Toyota RZ engine
Toyota RZ engine
Overview
Manufacturer	Toyota Motor Corporation
Production	1989–2004
Layout
Configuration	Naturally aspirated Straight-4
Cylinder bore	86 mm (3.39 in); 95 mm (3.74 in);
Piston stroke	86 mm (3.39 in); 95 mm (3.74 in);
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	Toyota K engine; Toyota Y engine;
Successor	Toyota TR engine

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 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:

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 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:

1989–2004 Toyota HiAce Van, Wagon
1998–2001 Toyota Hilux
2000–2004 Toyota Kijang/Revo/Venture

2RZ

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.

2RZ-E

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. It does not have balance shafts and is known for vibrations.^[1] 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 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.^[2]^[3] A 2.2 L (2,185 cc) version called the 4RB3 is also manufactured in China which 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.^{[citation needed]} According to a review in 2023, there are reports of the engine typically lasting over 250,000-300,000 miles and less frequently 500,000 miles.^[2]

Applications:

1995–2004 Toyota Tacoma 4x2^[2]
1998–2004 Toyota Hilux^[2]
1999-2006 ARO 24 Series

3RZ

3RZ-FE

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 reported to last 150,000 miles.^[4] The cylinder head is composed of aluminum alloy and the intake manifold is made from aluminum.^[5]