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Introduction

The FA20D engine was a ii.0-litre horizontally-opposed (or 'boxer') four-cylinder petrol engine that was manufactured at Subaru's engine plant in Ota, Gunma. The FA20D engine was introduced in the Subaru BRZ and Toyota ZN6 86; for the latter, Toyota initially referred to it equally the 4U-GSE before adopting the FA20 name.

Cardinal features of the FA20D engine included information technology:

• Open up deck design (i.e. the space between the cylinder bores at the meridian of the cylinder block was open);
• Aluminium alloy block and cylinder head;
• Double overhead camshafts;
• Four valves per cylinder with variable inlet and exhaust valve timing;
• Direct and port fuel injection systems;
• Compression ratio of 12.5:one; and,
• 7450 rpm redline.

FA20D block

The FA20D engine had an aluminium alloy block with 86.0 mm bores and an 86.0 mm stroke for a capacity of 1998 cc. Within the cylinder bores, the FA20D engine had cast iron liners.

Cylinder caput: camshaft and valves

The FA20D engine had an aluminium blend cylinder head with chain-driven double overhead camshafts. The 4 valves per cylinder – ii intake and two exhaust – were actuated past roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms (which actuated the valves). The hydraulic lash adjuster – located at the fulcrum of the roller rocker arm – consisted primarily of a plunger, plunger leap, check ball and check brawl leap. Through the use of oil force per unit area and spring force, the lash adjuster maintained a constant zero valve clearance.

Valve timing: D-AVCS

To optimise valve overlap and utilise frazzle pulsation to raise cylinder filling at high engine speeds, the FA20D engine had variable intake and frazzle valve timing, known equally Subaru's 'Dual Agile Valve Control System' (D-AVCS).

For the FA20D engine, the intake camshaft had a lx degree range of adjustment (relative to crankshaft angle), while the exhaust camshaft had a 54 degree range. For the FA20D engine,

• Valve overlap ranged from -33 degrees to 89 degrees (a range of 122 degrees);
• Intake elapsing was 255 degrees; and,
• Exhaust elapsing was 252 degrees.

The camshaft timing gear assembly contained accelerate and retard oil passages, too as a detent oil passage to brand intermediate locking possible. Furthermore, a sparse cam timing oil command valve assembly was installed on the front surface side of the timing chain comprehend to brand the variable valve timing mechanism more compact. The cam timing oil command valve assembly operated according to signals from the ECM, controlling the position of the spool valve and supplying engine oil to the advance hydraulic bedchamber or retard hydraulic chamber of the camshaft timing gear assembly.

To modify cam timing, the spool valve would be activated by the cam timing oil control valve associates via a signal from the ECM and move to either the right (to advance timing) or the left (to retard timing). Hydraulic force per unit area in the advance chamber from negative or positive cam torque (for advance or retard, respectively) would apply pressure to the advance/retard hydraulic chamber through the accelerate/retard cheque valve. The rotor vane, which was coupled with the camshaft, would then rotate in the advance/retard direction against the rotation of the camshaft timing gear assembly – which was driven by the timing chain – and advance/retard valve timing. Pressed by hydraulic pressure level from the oil pump, the detent oil passage would get blocked so that it did not operate.

When the engine was stopped, the spool valve was put into an intermediate locking position on the intake side by spring power, and maximum accelerate country on the frazzle side, to gear up for the side by side activation.

Intake and throttle

The intake system for the Toyota ZN6 86 and Subaru Z1 BRZ included a 'sound creator', damper and a thin rubber tube to transmit intake pulsations to the cabin. When the intake pulsations reached the sound creator, the damper resonated at sure frequencies. According to Toyota, this design enhanced the engine induction noise heard in the motel, producing a 'linear intake sound' in response to throttle application.

In contrast to a conventional throttle which used accelerator pedal effort to decide throttle angle, the FA20D engine had electronic throttle control which used the ECM to calculate the optimal throttle valve bending and a throttle control motor to command the angle. Furthermore, the electronically controlled throttle regulated idle speed, traction control, stability command and cruise control functions.

Port and direct injection

The FA20D engine had:

• A direct injection system which included a high-pressure fuel pump, fuel delivery pipe and fuel injector assembly; and,
• A port injection system which consisted of a fuel suction tube with pump and gauge assembly, fuel pipe sub-assembly and fuel injector associates.

Based on inputs from sensors, the ECM controlled the injection volume and timing of each type of fuel injector, co-ordinate to engine load and engine speed, to optimise the fuel:air mixture for engine conditions. According to Toyota, port and direct injection increased performance beyond the revolution range compared with a port-only injection engine, increasing power by up to x kW and torque past upward to 20 Nm.

Equally per the table below, the injection system had the following operating atmospheric condition:

• Cold start: the port injectors provided a homogeneous air:fuel mixture in the combustion chamber, though the mixture around the spark plugs was stratified by compression stroke injection from the straight injectors. Furthermore, ignition timing was retarded to raise frazzle gas temperatures so that the catalytic converter could achieve operating temperature more chop-chop;
• Low engine speeds: port injection and straight injection for a homogenous air:fuel mixture to stabilise combustion, ameliorate fuel efficiency and reduce emissions;
• Medium engine speeds and loads: direct injection just to apply the cooling issue of the fuel evaporating as it entered the combustion chamber to increase intake air book and charging efficiency; and,
• High engine speeds and loads: port injection and direct injection for loftier fuel flow book.

The FA20D engine used a hot-wire, slot-in type air flow meter to measure intake mass – this meter allowed a portion of intake air to flow through the detection area then that the air mass and catamenia rate could be measured directly. The mass air flow meter as well had a built-in intake air temperature sensor.

The FA20D engine had a compression ratio of 12.5:1.

Ignition

The FA20D engine had a direct ignition system whereby an ignition coil with an integrated igniter was used for each cylinder. The spark plug caps, which provided contact to the spark plugs, were integrated with the ignition coil assembly.

The FA20D engine had long-reach, iridium-tipped spark plugs which enabled the thickness of the cylinder caput sub-assembly that received the spark plugs to be increased. Furthermore, the h2o jacket could be extended near the combustion chamber to raise cooling operation. The triple ground electrode type iridium-tipped spark plugs had 60,000 mile (96,000 km) maintenance intervals.

The FA20D engine had flat type knock control sensors (non-resonant type) attached to the left and correct cylinder blocks.

Exhaust and emissions

The FA20D engine had a four-2-one exhaust manifold and dual tailpipe outlets. To reduce emissions, the FA20D engine had a returnless fuel organization with evaporative emissions control that prevented fuel vapours created in the fuel tank from being released into the atmosphere by catching them in an activated charcoal canister.

Uneven idle and stalling

For the Subaru BRZ and Toyota 86, at that place have been reports of

• varying idle speed;
• rough idling;
• shuddering; or,
• stalling

that were accompanied by

• the 'bank check engine' light illuminating; and,
• the ECU issuing mistake codes P0016, P0017, P0018 and P0019.

Initially, Subaru and Toyota attributed these symptoms to the VVT-i/AVCS controllers not meeting manufacturing tolerances which acquired the ECU to detect an abnormality in the cam actuator duty cycle and restrict the operation of the controller. To fix, Subaru and Toyota developed new software mapping that relaxed the ECU'southward tolerances and the VVT-i/AVCS controllers were subsequently manufactured to a 'tighter specification'.

In that location have been cases, however, where the vehicle has stalled when coming to residue and the ECU has issued fault codes P0016 or P0017 – these symptoms take been attributed to a faulty cam sprocket which could cause oil pressure loss. As a result, the hydraulically-controlled camshaft could non reply to ECU signals. If this occurred, the cam sprocket needed to exist replaced.

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Source: http://www.australiancar.reviews/Subaru_FA20D_Engine.php

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