We made our own engine
, and ran it off the old atomic four.
We used a General TT911 pressure washer pump, I picked up for around $250.00. We flushed it with fresh water after every uses and had no corrosion
issues. Ours was very simple. No clutch
. We just put the belt on when we needed to make water. I added a 4 inch pulley to the front of the crankshaft, (we made our own adapter but Moyer Marine
can hook you up with one). I also put a 4 inch pulley on the pump, and welded up a bracket that held the pump over the area of the starter. I used swagelock fittings and stainless tube for the high pressure lines and plastic tubing on the rest. We used a waterpuppy 12volt pump to keep her primed. From the waterpuppy she was plumbed to two prefilters. If I remember right they went from 30 microns to 10 microns. A stainless high pressure regulating valve, and couple of gauges to monitor
the pressure and flow of the brine and product water. We used one 4025 fiberglass
pressure vessel and membrane and got 15 plus gallons per hour. We plumbed in three way valves to divert the product water from a spigot on the sink and the main tank.
To make water we would put the belt on the pump, flip the switch on the primer pump, start the engine
, and adjust the engine rpms, being carefull not to over rev the pump. With the 3 way valve turned to the sink, I would adjust the pressure valve until the high side showed 800 psi, and the product flow was between 15 and 18 gph. By the time I made it to the sink to taste the water, it was always sweet and salt
free, I would then turn the valve to tank and fill her up. When done I would fill a two gallon bucket with product water from the sink and then put a flush hose into the bucket. The flush hose was hooked to another three way valve before the primer pump. I would turn the flush valve and let it suck clean water until almost empty and then shut down the motor
The only problem we had was a bearing that went out in the waterpuppy primer motor
. I now have a half dozen of the cheap
bearings as spares.
I cant tell you how much the system cost, because I was afraid to add it up. The big items are the pressure vessel, pump and regulating valve, but there are deals around if you have time to shop around.
I also know you can buy a lot of water for a thousand dollars. You can decide if my system seems like more of a hassle than loading jerry cans into the dingy and going in search of agua. We were a small boat with not a lot of tankage so it worked for us.