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Wikipedia / Toyota RZ 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 version built from 1989. Bore and stroke is . The original carburetted model in Japanese trim produces at 5,400rpm and maximum torque of at 2,400prm.

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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 5,200rpm and maximum torque of at 2,600prm. With redline at 5,500rpm.

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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 4800rpm with 146 lb⋅ft (198N⋅m) of torque at 2600 rpm. It does not have balance shafts and is known for vibrations. 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:

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 5000rpm with of torque at 4000rpm. 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 which has a bore and stroke of , while sharing the 2RZ's bore spacing. 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.

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3RZ

3RZ-F

The 3RZ-F is a carbureted version of the 3RZ engine, produced for G.C.C. and General Markets where mechanical simplicity was prioritized over electronic fuel injection.

It shares the same 2,693 cc displacement, 95 mm bore, and 95 mm stroke as the 3RZ-FE. Performance is approximately 143 PS (105 kW) at 4,800 rpm and 226 N·m (167 lb·ft) of torque at 3,600 rpm.

Applications:

3RZ-FE

The 3RZ-FE is a version. Bore and stroke is . Compression ratio is 9.5:1. Output is at 4800rpm with of torque at 4000rpm. 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. The cylinder head is composed of aluminum alloy and the intake manifold is made from aluminum.

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See also

References