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Hi Prof. Henry, The high-flow pumps are of that variety, but I wrote that they are
waiting to go on the car. I quickly looked at the directions a few minutes ago and they give a recommendation for the Shewman stats, and say something like 'no stats are better than ones that restrict flow,' but that is consistent with what is known about Mr. Haney's pumps, and many of the available stats as you have detailed and I have learned. G.M. has written that he worked on both products, I think, and he has been quite free with the information that supports his theories on cooling which he's developed through testing.
I am not anxious to change what I'm running now because I don't have any issues at all, as I wrote earlier, I've never seen the car spit a drop on the ground and the fluid quantity doesn't change very much. I'm also conflicted about which way to go re: stats. It is my belief that our car doesn't have them installed right now. I just went and squeezed the hoses and can't figure where they would be, they don't seem to be in the upper hoses (our car is a '36, the engine has a tag on the bell housing that says 'Authorized Ford Reconditioner,' a stamped number, and Code 15, and I've never tracked it down as to the year of the block, but the pumps are in the heads).
Another small complication is that I'm not actually sure what kind of temps our car runs at because the temp gauge doesn't have numbers on it and I haven't made it a priority to use the laser temperature reading gizmo regularly. Even in long downhill situations our gauge doesn't change more than about 1/4 inch or so, whatever that means temp wise. The hottest I've seen it, idling in a parking lot at the end of 65mph interstate run in the summer, and I could still see some air above the red liquid on the gauge.
I am convinced that your test showed, on the downhill portion, that having the stats in your car absolutely kept the temps more in the desired operating range.
We've been through almost every mechanical system on our car in the last four years, but we've stayed away from messing with the engine simply because it works so well. (Rebuilt or refurbished: generator, carb, dizzy, coil, plug wires, starter, steering box and horn rod, tranny, rear, springs, shocks, fuel tank, brakes and cross-shaft, muffler, and a new top, but that's not mechanical, just what I can think of right now.) I have a spare 21-stud that I just ran on a test-stand in June, and just can't convince myself that it would be better than what we're running now. So, status quo for me for the near future.
-VT/JeffH