For those interested, here's an article on engine cooling design, and how to make your own, inexpensive, "water manometer" to test cooling pressure and effectiveness.

http://eci.aero/pdf/EngineCoolingProblems-SAE.pdf

-Kirk Wennerstrom
President, Cessna 150-152 Fly-In Foundation
1976 Cessna Cardinal RG N7556V
Hangar D1, Bridgeport, CT KBDR