TOYOTA 4A-FE ENGINE
A narrow-valve DOHC 16-valve carburetor engine, the 4A-F, was produced from 1987 through 1990. Output was 94 hp or 70 kW at 6000 rpm and 135 N·m at 3600 rpm. Then came the 4A-FE and 4A-GE engines that were extremely popular amongst engine builders and performance street car enthusiasts because of their adaptability to large performance gains .
The two generations of the 4A-FE engine can be identified by the external shape of the engine. The first generation from1987 to 1993 featured a plate on the head which read "16 valve EFI" and fuel injectors in the cylinder head. The second generation had a higher profile cam design, a cam cover with ribs throughout its length, and fuel injectors in the intake manifold runners. Mechanically, the late-model motors received redesigned pistons, intake ports, and intake manifold and upgraded ECU and air flow meters for induction.
Toyota designed this engine with fuel economy in mind. The 4A-FE is basically the same as the 4A-F, the most apparent difference being the EFi (eelectronic fuel injection), system as noted by the letter ‘E’. The engine was succeeded by the 3ZZ-FE which is a 1600cc engine with VVTi (variable valve timing injection) technology.
The 4A-FE is different from the 4A-GE in terms of performance and power. Although both engines have the same displacement and are both DOHC engines. The first obvious difference are that the valves were placed 22.3° apart compared to 50° in the G series engines. The second is that it employed a "slave cam system" meaning that both camshafts are geared together and driven off one camshaft's sprocket whereby both camshafts sprockets are rotated by the timing belt. Even though the valve angle is closer to what is considered in some racing circles to be ideal for power, its other design differences and the intake which is tuned at low RPM which means that it has about 10% less power compared to the 4A-GE engine. The 4A-FE engine design improves fuel efficiency and torque, but compromises power. Although not as powerful as the 4A-GE, both engines are renowned for the power they produce from such a low displacement relative to most other engines in their league.
The fourth-generation 4A-GE engine was produced from 1991 to 1995. It has silver cam covers with chrome lettering, hence the nickname "silver top" was allocated to it because of the unmistakable tapat cover as with all the other variants. This engine again features a completely new cylinder head uses 5x valves per cylinder instead of four. It uses Toyota Variable Valve Timing system on the intake cam, an increased compression ratio (10.5:1), and the intake system was replaced with a short manifold with individual throttles and Toyota retained the vane-type air flow meter. The previous 16-valve head used a sharply curved intake port, while the 20-valve engine used very upright straight ports for breathing. This engine produces 118 kW at 7,400 rpm with 162 N·m of torque at 5200 revs per minute.
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