Paul,
I love the diagrams. I see little fault in your approach, and I agree having twice the internal surface area for heat exchange would do wonders for some of the guys who have to run the antifreeze systems. Cost being no object, I would go for one extra large heat exchanger with a dedicated feed line, and I would run the oil cooler on that secondary circuit as you suggested. The comment about a lot of the SenDure CC heat exchangers laying around is probably true. It probably would not be all that much trouble to graft on another one. It would be very intresting to do one, and run the boat and compare one side to the other regarding temperature, warm up, ability to control heat, etx.
Tom |