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Enjoy.
Here's the specific detailed article on making the adjustable PRV:
http://www.team.net/www/rootes/sunbeam/alpine/mk1-5/techtips/prvalve.html
But I'm still looking for an answer to my question :
Is my PRV, with threads just under the hex head, with brass body and steel piston the latest SV design? And is it the least likely to stick?
Tom
Could be a failure of my garage-based measurements, of course. I ended up using a kind of hanging produce scale, pushing down on the device while a rod depressed the cylinder. Not an elegant setup, to be sure.
I also don't know what pressure the modified device is set to, for the given engine it was on. I'm confident that engine had reasonable oil pressure, though.
The "other dangers" mentioned includes the whole "pinned" and/or floating bearing issue, which is certainly above my pay grade -- but it's also beyond me to just dismiss it... And, of course, Chuck's blown oil filter. That I can understand!
I stalled out on the "how much does the window have to open to decrease the pressure" question, and the function of the valve in the system.... Is it a occasional use self-resetting circuit breaker, or more of a continuously operating pressure regulator? Seems to be the latter?
The oil PRV modification was on my to-do list since this thread started. So I started browsing the engine "inventory" to find a suitable core. To my surprise, when I uncovered the "Jim Stone" engine, (acquired a few years back...) there on the oil filter block sat a pre-modified OPRV. I'll find out tomorrow if the filter block that's on the engine in the car is compatible, or if a transplant is required. But it's better than starting from scratch...
Thanks, Jim!