The Mazda Protege Intake Manifold directs the fresh air or the finely mixed air-fuel mixture to individual cylinders to achieve the optimum amount of power and efficiency. Placed immediately after the throttle body, this Intake Manifold network of runners guarantees that all the combustion chambers receive equal portions, preventing lean misfiring and enhancing smooth acceleration. On editions that use carbureted or single-point injection, the part combines fuel and air within its passageways, whereas subsequent multi-port and direct-injection designs allow it to flow only air, allowing the fuel to be delivered by downstream injectors. The early Mazda models applied stout cast aluminum or iron models that were strong but had weight and heat dissipation issues. Newer Mazda assemblies changed to lightweight composite plastic and shed mass and cooled the charge for livelier throttle response. Some Protege models applied a variable length technique known as variable resonance induction that adjusts the valves to vary the length of the runners. High rpm uses short paths to increase horsepower in Helmholtz resonance, but long runners at low rpm increase torque by accelerating airflow. Irrespective of these design changes, all Intake Manifolds continue to seal to the head using gaskets, and any leakage disrupts the fuel maps of the computer, resulting in rough idle. Coolant galleries and the thermostat mount are also found on some units and provide a means to supply data to the ECU through sensors such as the engine coolant temperature or air charge temperature sensors. The various materials and the adaptive runner technology combined can be seen as showing how Mazda is currently trying to achieve the desired balance in strength, weight, and breathing efficiency in this very important Intake Manifold.
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