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Toyota 4A-GZE Engine

 

1987 saw the release of supercharged version of 4A-GE engine, which was named 4A-GZE. 16 valve DOHC engine was sharing the same cast iron short block with second generation 4A-GE. This block was strengtened by 7 external vertical ribs as opposed to three found on earlier engines. All dimensions, 1587cc with 81.0mm bore x 77.0mm stroke were were also the same with 4A-GE. 4A-GZE was utilizing a SC12 supercharger paired with a Nippon Denso air-to-air intercooler mounted right underneath the engine cover's cooling vent. SC12 was a positive displacement root supercharger developed by Toyota. It was featuring teflon coated rotors and an electro-magnetic clutch controlled by the ECU. During low and mid-range engine operation, when power was not required, electro-magnetic clutch on the supercharger’s input shaft was disengaged, idling the supercharger unit. During acceleration and high engine load ECU engaged the electromagnetic clutch and the supercharger started to pump in air.

 

4A-GZE incorporates several modifications in order to cope with forced induction. Cast aluminum pistons were replaced with lower compression ceramic coated forged aluminum ones along with a stronger cranckshaft and forged connecting rods. Cylinder head gasket was made of carbon with steel wires around the bores for better sealing. Camhaft design was revised to provide better valve timing, and the fuel injection system has been recalibrated. To round out the development, the intake and exhaust tracts have also been tailored to the new engine. Just like other Toyota engines, 4A-GZE went through some modifications to increase and efficiency. Although there is no such official classification from Toyota, 4A-GZE engine are generally collected under three generations.

 

Toyota 4A-GZE

 

First Generation

 

First generation of 4A-GZE was released with AW11 Toyota MR2 in 1987 . One year later JDM AE92 Toyota Levin recived 4A-GZE engine. First generation was using distributor type ignition coupled with an air flow meter, knock sensor and an oxygen sensor. Compression ratio was 8.0:1. First generation 4A-GZE engines were delivering 145hp at 6400RPM and 186Nm at 4400RPM.

 

 

Second Generation

 

Second generation 4A-GZE was only  used in JDM AE92 Toyota Levin between 1991-1992. In second generation 4A-GZE, the distributor type ignition was replaced with direct-fire twin coil igniton using a MAP air sensor.  Big port head was changed with small port head and the compression ratio was increased to 8.9:1. With the new improvements engines output was raised to 165hp at 6400RPM and 201Nm at 4400RPM.

 

Third Generation

 

Third generation 4A-GZE was used to power AE101 Toyota Levin between 1992 to 1995.  Third generation 4A-GZE was almost the same with second generation. The only change was the smaller diameter pulley used in supercharger to provide extra boost. Third generation engines were the most powerfull of all 4A-GZE engines delivering 170hp at 6400RPM and 206Nm at 4400RPM.

 

Production of 4A-GZE ended in 1995 with release of 20V 4A-GE engine.

 

 

Model

4A-GZE

Displacement (cc)

1587

Power Output (hp)

145 - 170

Compression Ratio

8.0:1 - 8.9:1

Bore (mm)

81.0

Stroke (mm)

77.0

Years Produced

1987 - 1995

 

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