Exhaust velocity probe

After acquiring a velocity probe designed for measuring exhaust direction airflow I went and put the stock intake manifold back on the flow bench to measure the air velocity at the various runner outlets while all were open and a steady air stream was pushed through the manifold.  Similar to the last time, the first two runners showed the lowest air velocities.

Intake manifold with viewport

Considering the shape of the IM plenum, the increasing velocity recorded by the velocity probe at the rearward runners is not surprising.

New for this test, and something that I will use for future evaluations, is a viewport that will allow me to precisely place the probe tip along the centerline of the intake manifold plenum.