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    What a plenum is?

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    jesse
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    What a plenum is?

    Post  jesse on Sun Mar 08, 2009 2:22 pm

    On the 350z / G35, your plenum is the aluminum intake manifold that sits right in the upper middle of your engine bay. To locate it, find the air intake box, follow the tube to the throttle body, and you will see that the plenum is connected to the throttle body. The plenum consists of both the "upper plenum" which you can see plainly in your engine bay, and a "lower plenum" which is not visible in your engine bay. You cannot see it because your lower plenum sits beneath the "upper plenum". If you remove your upper plenum to install a spacer for example, you will see the "lower plenum," also known as a "lower collector". The lower plenum consists of 6 tubes or "runners" that guide the air from your plenum into each cylinder. They may not look that fancy, but in fact, the precise length of these tubes has a significant impact on horsepower and torque.

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