The Audi A3 Intake Manifold equally distributes air or an air-fuel mixture to the individual cylinders to ensure that the engine provides smooth power and good mileage. Early Audi models fed the mixture through throttle-body or multi-port injectors and utilized cast aluminum runners, which depended on turbulence to disperse fuel droplets. With the adoption of direct injection on subsequent A3 models, the Intake Manifold was not modified but instead merely received a control to pass only clean air, allowing plastic composite construction to reduce weight and keep the charge cooler to withstand stronger combustion. Another technology that Audi applied was the two-piece Intake Manifold design that was sealed by tight gaskets, since any spillage makes the mixture lean, resulting in a rough idle condition or lost performance. In most V-style engines the Intake Manifold serves as a valley cover and may also direct coolant, putting the thermostat and the engine coolant temperature sensor directly in its lines and an air charge temperature sensor directly in its incoming air. Some Audi systems also incorporate variable-length runners, a clever idea that varies the tract length to exploit the Helmholtz resonance, increasing torque at low revs and horsepower at high speed with no additional components. Fixed or variable, all Intake Manifolds should evenly divide the flow between cylinders, and variations in material, fuel delivery system, and adjustable length of the runners are the primary development of this critical component of the Audi model.
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