To further break that down the bare min spec thru from the output side of the Impeller housing is 10 gallons per minute again the bare min of water

Jabsco marine says 10 gallons per minute, per 100hp of flow is needed. So, a 500hp engine, would need 50 gallons per minute, or 3,000 gallons per HOUR of flow. A 1000hp deal, would need 6000 gallons per HOUR according to that.

I have a flow chart at home of what the jabsco merc style sea water pump can move at various inlet pressures. Its actually pretty amazing how much water they can move!

Even with a different well seems like you wouldn't be able to keep up. Get one of those big white plastic tanks like they use for horses that hold hundreds of gallons and can be transported in the bed of a truck. Use that as a buffer with your current well feeding it ? I've seen the up to 550 gallons for under $500 new

MT, your math is flawed......it would be 3000 and 6000 gallons per hour not minute...the 1000hp motor would need 100 gallons per minute...

Joe with that volume of water flow you would sink a boat in a minute as no bilge pump in the would keep up with that volume if ever any output hose engine side would ever break or come off while running.

I do not know of any gas side marine water pumps / impellers that could ever pump that much volume water especially thru drive inlets and a 1 inch to 1 1/4 inch inlet and outlet hoses

Can Fire trucks pump that much volume water in a minute / Just asking .

I plan on using a tank to buffer it too but my current well puts out about 6 or 8 gpm for a few minutes plus 40 or 50 gallons from the 60 gallon exp tank, def upgrading as i dont want to stand around all day waiting for tank to fill

Working in the pumping industry i was just thing about this as i came across your posting......looking at my friction loss charts 1" pipe max's out at 50gpm and 1-1/4" pipe max's out at 90gpm.....you would need a hella strong pump to push liquid at those rates....

just did a quick search of fire trucks too....they are running a 2.5" line at 150 psi and discharging a min of 250gpm...but i saw another posting where the pumps on these trucks are now in the 1500-2000 gpm range!! wow!

the output gpm will all depend on how much pressure the pump can make and how much friction its fighting against with th e length of line...the size of the line...any fittings, discharge nozzle size etc...

Yes, typo. I meant to say per hour, not minute.

and do not forget especially with Merc is pulley size & ratio along with belt set ups and pump speed.

there is no way a stock bravo pump is going to pump a 100 gallons per min NO WAY IN THE WORLD and I doubt a gas size crank mounted pump will either that is NOT custom made. You would have to spin that crank mount so fast to get that kind of water volume output ( I am talking about 100 gallons of water output completely discharged) . It can not even completely run thru your engine that fast of a 100 gallons of water per minute. No way you could ever pass that much volume of water thru a t stat alone along with exhaust water jackets especially the restricted riser gaskets.