The main function of an intake manifold is to distribute air evenly to the intake ports where the fuel is mixed with air. A good intake manifold should increase your car’s power output by up to 15 horsepower. Longer runners affect the performance poorly in low RPM runs, while short runners help increase the peak torque RPM. The width and the length of the intake manifold runner are key in determining the power of a vehicle. The fuel/air mixture is now sent to the cylinder heads for combustion. At the end of an intake manifold runner, there is where the fuel is injected from the fuel rail. An intake manifold runner takes up a shape of a pipe which enriches airflow. However, larger plenums usually perform poorly in low RPM applications which can be bad for daily driver vehicles.Īn intake manifold distributes air to the combustion chamber evenly Īfter the air is distributed from the plenum, it goes to the runners. This means that performance intake manifolds come with a larger plenum to add a boost to the overall power output of their car. The larger the plenum, the more air you can pump to your engine. The main function of an intake manifold plenum is to evenly distribute air before it passes to the runners. This component holds air accumulated from the atmosphere through the throttle body which is later pumped to the engine. The intake manifold plenum serves similarly to a gas tank. There are still manufacturers who use aluminum or cast iron for a more rigid and performance-oriented intake manifold. Since an intake manifold doesn’t take hot gasses from the engine, some manufacturers decide to use plastic to make intake manifolds. An intake manifold is an integral part of providing power to the engine as it distributes the airflow accordingly.
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