You may have some understanding of fluid mechanics but what we're dealing with here is a specific application of those principles you don't seem to be able to comprehend. I know from my 50 years of experience in the automotive industry exactly what can happen if the issue of the bypass port is ignored when replacing thermostats. I have made significant sums of money from those people who don't understand the significance of that little port and overheat their engines as a direct consequence. You just go on, in your ignorance, proving the old adage that *a little knowledge is a dangerous thing*.