Engine control circuit diagram – Audi 80, Audi 90 (2.3L, 100 kW, KE-III-Jetronic, 5-cylinder)

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Audi 80, Audi 90 2.3-liter, 5-cylinder engine equipped with the KE-III-Jetronic fuel injection system. Here’s a more detailed breakdown of its features:

1. Engine Displacement (2.3L)

2.3L refers to the volume of all the cylinders in the engine. This engine has a total displacement of 2.3 liters, meaning it can draw in and combust that much air/fuel mixture during a complete cycle.
A larger displacement typically allows for more power, but also may result in higher fuel consumption compared to smaller engines.

2. Power Output (100 kW)

100 kW is the maximum power that this engine can produce, which is approximately 134 horsepower (hp).
This level of power is common for engines in mid-sized cars, balancing efficiency with performance.

3. KE-III-Jetronic Fuel Injection System

KE-III-Jetronic is an advanced version of the Bosch Jetronic series, a mechanical-electronic fuel injection system. The “K” refers to the German word “Kontinuierlich,” meaning “continuous,” indicating a constant flow fuel injection method.
The KE-III-Jetronic is a hybrid system with both mechanical and electronic components. It controls the air-fuel mixture more precisely than earlier purely mechanical systems, leading to better fuel efficiency and emissions control.
It was widely used in cars in the 1980s and early 1990s, as it improved cold starting, throttle response, and general drivability.

4. 5-Cylinder Configuration

The 5-cylinder setup is known for its unique balance of performance, smoothness, and distinctive sound.
Compared to 4-cylinder engines, a 5-cylinder tends to be smoother because of the firing interval, resulting in less vibration.
The 5-cylinder configuration also offers a good balance between power and fuel efficiency, which is why it was popular in vehicles like the Audi 90 and Volvo 850.

Characteristics and Applications

Engines like this 2.3L, 5-cylinder with KE-Jetronic were used in a variety of cars, especially from European manufacturers such as Audi and Volvo. These engines are renowned for their durability, distinctive engine sound, and their ability to deliver torque across a broad RPM range, which makes them versatile for both city and highway driving.