Scion Engines

From SCION-TECH : The Scion Resource : tC, xA, xB, xD

[edit] 1NZ-FE

Used in: Scion xA and Scion xB (2004-2007)

The 1NZ-FE is a 1.5 L (1500 cm³) conventional Otto cycle variant of the 1NZ-FXE. It has the same bore and stroke, but the compression ratio is lowered to 10.5:1, and it features VVT-i. Output is 108 hp at 6000 rpm with 105 ft·lbf of torque at 4200 rpm.

• Displacement: 1.5 L
• Head: Dual Overhead Cam (DOHC) I4 engine.
• Bore: ---- mm
• Stroke: ---- mm
• Compression Ratio: 10.5:1
• Power: 108 hp (81 kW) @ 6000 rpm (revised to 103 SAE net horsepower in 2006)
• Torque: 105 ft·lbf (142 Nm) of torque @ 4200 rpm (revised to 101 ft·lbf in 2006)

[edit] 2ZR-FE

Used in: Scion xD

The Scion 2ZR-FE is a DOHC, 16 valve, 1.8L (1797cc) engine equipped with VVT-i. This all-new engine is now replacing the 1ZZ-FE engine in most applications. Output for this engine is rated at 136 hp at 6000 RPM and 129 ft·lbf of torque at 4400 RPM.

• Displacement: 1.8 L
• Head:Dual Overhead Cam (DOHC), 16 valve 4-cylinder
• Bore: 80.5mm
• Stroke: 88.3 mm
• Compression Ratio : 10.0:1
• Power: 136hp @ 6,000 rpm
• Torque: 129 ft·lbf @ 4,400 rpm

[edit] 2AZ-FE

Used in: Scion tC and Scion xB (2008+)

This motor comes from the Toyota Camry and is more aggressively tuned for the Scion tC and 2nd generation xB. The 2AZ-FE is a 2.4 L (2362 cc) engine built in Japan, obtains a total displacement of 2362 cm³ with 88.5 mm (3.5in) bore and 96.0 mm (3.8-in) stroke, resulting in a compression ratio of 9.6:1. Output is 161 hp at 5,700 rpm with 163 ft·lbf of torque at 4000 rpm. The 2AZ-FE also has one-piece cast camshafts.

• Displacement: 2.4 L
• Head: Dual Overhead Cam (DOHC) 16-valve 4-cylinder with VVT-i
• Bore: 88.5 mm
• Stroke: 96.0 mm
• Compression ratio: 9.6:1
• Power: 161 hp (120 kW) @ 5,700 rpm
• Torque: 163 lb·ft (220 N·m) @ 4000 rpm

Also See: 2AZ-FE SAE Tech Brief

The 2AZ-FE incorporates many features of Toyota's dual-overhead-camshaft, four-valves-per-cylinder engines, including the slant-squish combustion chamber, offset cylinder and crank centers, and the VVT-i continuously variable intake valve timing system. The aluminum engine measures 626-mm (25-in) long, 608-mm (24-in) wide, and 681-mm (27-in) tall.

The 2AZ-FE obtains a total displacement of 2362 cm3 with 88.5-mm (3.5-in) bore and 96.0-mm (3.8-in) stroke. The cylinder block is now an open-deck, midi-skirt die-cast aluminum type with cast-in iron liners and a die-cast aluminum lower crankcase and a stamped oil pan. The forged steel crankshaft is fully balanced with eight counterweights and supported by five main bearings. A helical gear pressed in No. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase. The balance shaft geartrain includes plastic Nos. 1 and 3 drive gears, meshing with steel gears.

The dual overhead camshafts are driven by a single-stage roller chain of 8.0-mm (0.3-in) pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent Toyota engine practice, no clearance adjusting shim is employed. Valve diameters are 34.0 mm (1.3 in) for intake and 29.5 mm (1.2 in) for exhaust, with 8.0-mm (0.3-in) lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°.

Fuel is injected sequentially via an ultra-fine-atomization injector with twelve small injection holes, each 0.18 mm (0.01 in) in diameter. As in the smaller NZ engine, the new AZ adopts a plastic, built-up, and vibration-welded intake manifold integrating a large volume plenum chamber (3.5-L (214 in3) volume including a 1.3-L (79 in3) resonator).

Twin three-way catalytic converters, each with a 0.84-L (51 in3) volume, are mounted immediately downstream of the stainless tubular exhaust manifold. The front exhaust pipe, collecting from the catalysts, has a separator in the pipe that reduces exhaust gas interference and improves low- and mid-speed torque.

The 2AZ-FE engine is rated at 118 kW (160 hp) at 5600 rpm and 221 N•m (163 lb•ft) at 4000 rpm on a 9.6:1 compression ratio, requiring regular-grade, unleaded gasoline. A smaller version of this engine, the type-1AZ 2.0-L unit, powers the recently updated RAV4 light SUV. The Japanese version of this engine, designated 1AZ-FSE, features the fuel-efficient "D4" direct-injection head.