The role of the Volkswagen Passat Intake Manifold is that the clean air or air-fuel mixture is evenly diverted to each cylinder, ensuring that the power does not vary and the emissions are low. Within any current-day Volkswagen engine, there are runners through which the air flows from the throttle body, guided by a network of smooth runners that all have lengths selected to even exploit the Helmholtz resonance to sneak some additional pressure into the combustion chambers to give the engine superior torque. The Intake Manifold should be balanced so that all the cylinders breathe equally. Previous models of the Volkswagen, which applied either carburetors or single-point injection, allowed the fuel to mix in the manifold, whereas more recent models with multi-port injection inject fuel at both ends of the runner, and the new models with gasoline direct injection inject only air, demonstrating the adaptation of the same component to changing fueling technology. The choice of materials has also changed, where heavy cast iron or aluminum has given way to lightweight composite plastic, which dissipates heat rapidly, allowing the charge to cool faster and increase efficiency. Other designs divide the housing into upper and lower sections that are enclosed by small gaskets, since any form of leakage would cause a lean mixture and rough idle. Numerous V-style engines also pump coolant throughout the manifold and even contain the thermostat, which allows temperature sensors to pass data to the computer so that it can be tightly controlled. To achieve higher performance, trims can be equipped with variable-length runners that narrow down to provide high rpm power and extend to provide low rpm pull, offering the Passat a wide range of power without losing fuel economy. Overall, the Intake Manifold is an extremely important but versatile component of any Volkswagen drive.
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