Bob, I think that may explain why some guys report an
oil pressure drop with RPM. I've seen it on my car with the smaller lines. As the engine speed increases, so does the
oil velocity through the remote filter system. Higher fluid velocities have higher head loss. My
oil pressure used to increase up to about 3500rpm...then start dropping as the revs continued to increase. Now with the bigger -12AN plumbing my pressure holds steady through the revs.