kshymkiw
05-01-2005, 06:07 PM
Specs on the tC/Estima 2az-fe engine:
-2362 Cubic Centimeters
-88.5mm Bore (3.5 in.)
-96.0mm Stroke (3.8 in.)
-dual overhead Camshafts
(4 vavles per cylinder via shimmed bucket tappets)
-valves inclined at 27.5 degrees
-Four Vane VVT-I
-Valve Diamaters:
Intake 34.0mm
Exhaust 29.5mm
-cylinder block: die cast aluminum with Iron Liners, Open Deck
-cylinder and crankshaft centers are offset to reduce piston slapping.
-the AZ engine is placed transversely, canted foreward, with the intake side facing the rear
-the 2AZ-FE puts out 118 kW (160hp) @5600 RPM 221 Nm (163 ft lbs.) at 4100 RPM
-The compression ratio for the AZ is 9.6:1
about the fuel system:
the scions have a fuel pressure regulator and fuel filter in the fuel tank. the returnless system means warm fuel from the engine bay does not return to the tank. the internal temperature of the fuel tank therefore stays cooler, reducing evaporative emissions.
about the VVT-i:
toyota’s intelligent continuously variable valve timing system is more advanced than the basic systems in some German luxury vehicles and Japanese small cars.
scions have the latest-generation TMC-developed vane-type VVT-i control, which debuted on Prius and Lexus IS200. VVT-i
provides continual variations of the intake valve timing, to match the engine’s operating conditions. This improves performance and fuel efficiency, and reduces vibration on engine start-up and shut-down.
2AZ-FE's inlet timing can be varied over a range of 50 degrees relative to crankshaft angle, to provide optimum valve timing for the full range of driving conditions.
Inlet camshaft timing is varied according to engine revolutions, throttle position, engine coolant temperature and intake air volume. The maximum retard setting provides zero valve overlap. (There is a five degree period between the exhaust valve closing and inlet opening.) Inlet cam timing is set to the maximum retard position for engine start-up, operation at low engine temperature, idle and engine shut-down. The maximum advance setting provides 55 degrees of valve overlap.
VVT-i Activation:
the scion's VVT-i is a computer controlled and oil-pressure activated push- push type system. The engine ECU can command the system to advance or retard the inlet camshaft timing, thereby providing for faster response. The hardware is a camshaft timing oil control valve mounted adjacent to the inlet camshaft gear wheel and a VVT-i controller mechanism built onto the inlet camshaft timing gear. The camshaft timing oil control valve is a spool valve, controlled via a coil and plunger by the engine ECU. It can signal "advance", "hold" or "retard". The VVT-i controller consists of a housing on the front of the timing wheel, driven from the timing chain, and a four-bladed vane coupled with the intake camshaft.
when the engine ECU requires a change in inlet timing, it signals the oil control valve to provide oil pressure to either the advance or retard side of the four vane chambers. A locking pin in the controller locks the camshaft timing in the maximum retard position for engine start-up and immediately after start-up (until oil pressure is established) to prevent any knocking noise.
Other Features:
-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°
-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
This engine is used in the tC, Camry, Estima and has a smaller version used in the Japanese Rav4 called the 1AZ-FSE, it is a 2.0L that features the fuel-efficient "D4" direct-injection head.
Any Corrections need to be made let me know!
-2362 Cubic Centimeters
-88.5mm Bore (3.5 in.)
-96.0mm Stroke (3.8 in.)
-dual overhead Camshafts
(4 vavles per cylinder via shimmed bucket tappets)
-valves inclined at 27.5 degrees
-Four Vane VVT-I
-Valve Diamaters:
Intake 34.0mm
Exhaust 29.5mm
-cylinder block: die cast aluminum with Iron Liners, Open Deck
-cylinder and crankshaft centers are offset to reduce piston slapping.
-the AZ engine is placed transversely, canted foreward, with the intake side facing the rear
-the 2AZ-FE puts out 118 kW (160hp) @5600 RPM 221 Nm (163 ft lbs.) at 4100 RPM
-The compression ratio for the AZ is 9.6:1
about the fuel system:
the scions have a fuel pressure regulator and fuel filter in the fuel tank. the returnless system means warm fuel from the engine bay does not return to the tank. the internal temperature of the fuel tank therefore stays cooler, reducing evaporative emissions.
about the VVT-i:
toyota’s intelligent continuously variable valve timing system is more advanced than the basic systems in some German luxury vehicles and Japanese small cars.
scions have the latest-generation TMC-developed vane-type VVT-i control, which debuted on Prius and Lexus IS200. VVT-i
provides continual variations of the intake valve timing, to match the engine’s operating conditions. This improves performance and fuel efficiency, and reduces vibration on engine start-up and shut-down.
2AZ-FE's inlet timing can be varied over a range of 50 degrees relative to crankshaft angle, to provide optimum valve timing for the full range of driving conditions.
Inlet camshaft timing is varied according to engine revolutions, throttle position, engine coolant temperature and intake air volume. The maximum retard setting provides zero valve overlap. (There is a five degree period between the exhaust valve closing and inlet opening.) Inlet cam timing is set to the maximum retard position for engine start-up, operation at low engine temperature, idle and engine shut-down. The maximum advance setting provides 55 degrees of valve overlap.
VVT-i Activation:
the scion's VVT-i is a computer controlled and oil-pressure activated push- push type system. The engine ECU can command the system to advance or retard the inlet camshaft timing, thereby providing for faster response. The hardware is a camshaft timing oil control valve mounted adjacent to the inlet camshaft gear wheel and a VVT-i controller mechanism built onto the inlet camshaft timing gear. The camshaft timing oil control valve is a spool valve, controlled via a coil and plunger by the engine ECU. It can signal "advance", "hold" or "retard". The VVT-i controller consists of a housing on the front of the timing wheel, driven from the timing chain, and a four-bladed vane coupled with the intake camshaft.
when the engine ECU requires a change in inlet timing, it signals the oil control valve to provide oil pressure to either the advance or retard side of the four vane chambers. A locking pin in the controller locks the camshaft timing in the maximum retard position for engine start-up and immediately after start-up (until oil pressure is established) to prevent any knocking noise.
Other Features:
-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°
-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
This engine is used in the tC, Camry, Estima and has a smaller version used in the Japanese Rav4 called the 1AZ-FSE, it is a 2.0L that features the fuel-efficient "D4" direct-injection head.
Any Corrections need to be made let me know!