Hi again Contaucreek and members,
My hopper attaches to the pipe flanges on head and block using short standoff pipes just several inches long. I have also attached a support plate to the bolts on the water jacket cover, so it has support at three points. Thermosyphon flow works well, but in our warm climate there's no way it would sustain full load for long. Don't like to see a diesel blowing steam, OK for old low compression kero engines perhaps, with a hopper on top of the head and nowhere for steam pockets to form. Suspect a hopper is only practical while one is in attendance to regulate load and top up coolant. Sorry I have not yet mastered the photo posting trick. My pulley ratio for a 50 hz alternator means my 8/1 runs about 800 rpm.
Regards, Combustor.