We needed (wanted?) a power unit to use at our off-grid farm that we could use to power several differant machines. Decided to go the radiator route since a barrel of water gets darned heavy to lug around and expensive to equip with anti freeze. Sorry for the busy backgrounds in the pics, hard to find an uncluttered area in my shop.
Our 6/1 DES power unit.
Radiator is from a John Deere LUC power unit. A little large for a single but should be about perfect for a twin. Chosen because it was designed for thermo syphon, meaning it has large water capacity above the upper hose and 4 row core. Plus they are both readily available and cheap. Adapters were turned to fit inside of the cast iron hose connections, tapped for 3/4 pipe and epoxied in place. Twisted v belt drive came to be via trial and error(lots of error) and may turn out to be not necessary due to the capacity of the radiator, time will tell.