Well, best way is to test it....Which i should of, but at the time, I was testing more things than i should have ...lol.

Get the dyno set up. Get a big reservoir.....test on 1st engine w/Bravo pump...and then build from there.

Schit, I have many pick up trucks come in here with bedliners that won't let water out with the tailgate up. Fill one of those suckers and have at it....to test of course....LOL.

I've had a hose come off my cooler right after the pump at 70mph. Within seconds, I had a bilge full of water. The first thing I noticed, before even the engine temp climbed, was my bilge pump LED light come on while running.

http://www.pumpagents.com/pdf/Jabsco...43210-0001.pdf

It was a typo. I meant to say those big numbers, in Gallons per hour, not per minute. Obviously, per minute, would be ridiculous.

When Brad dyno'd my engines at Smith Power, he had a primary and secondary pump, the primary was good to about 1500 revs any more and it would start collapsing the hose so the secondary pump would be turned on when power pull's were to be made, 1'1/4 hose hooked directly to the sea pump, its amazing how much water that little impeller will move, congrats Smitty I sold your boat, haha

I know Joe as I am saying in general for the marine gas engine side that they will not even pump 100 gallons per minute. Custom made ones possible but I have never seen it and would have to see with my own eyes. Not directing that post at you.

off the top of my head for Mercruiser black engine side OEM stock

4000 rpms engine speed
bravo apps and water inlet flowed thru the outdrive

bare min water pressure at 4000 rpms for the 4.3 and ALL smallblocks closed cooled apps is 20 psi again bravo apps and seawater cooled apps water pressure 8.5 psi for the 4.3 L and 10 psi for the 5.0L and 11 psi for the 5.7 and 6.2 L. Minimum water flow volume at 4000 rpms 28 gallons per minute for closed cooled for these apps for these closed cooled apps.

Seawater cooled is 13 gallons per min water volume flowed for the 4.3L then 15 gallons for the 5.0L and then 17 gallons for the 5.7 & 6.2 - again this for the min water pressure readings and min water flow volumes @ 4000 rpms for the bravo with these apps installed.

the 496 - 8.1 L is of course closed cooled needs a min of 11 psi water pressure at 4000 rpms and bare min of 20 gallons volume of water flowed per minute. Only 20 gallons for this app but keep in mind that the bare min at bare min of 11 psi for the 496 Mercruiser.

A standard fire ground stream is a 2 1/2" line 200' long, flowing through a 1 1/8" nozzle bore 250 Gpm @ 80 psi. The trucks pump is typically 1250 Gpm @ 150 psi, 885 @ 200 psi, 625 @ 250 if it is a 2 stage pump like the one I'm working on right now.

Glad you sold it! The first thing im dynoing after norm gets the dyno going is my 502 im building to sell my baja with. Fresh short block, mildly ported rectangle port gm heads, my modified 502 mpi intake and bored throttle body off my 540 blower motor with a hp 500 efi cam and morel lifters, i expect between 480 and 520 hp, if it makes 400 or 600 the dyno is off, i will post results. Just spoke to well driller, he says 15 gpm is easy, if we go 50 to 100 feet deeper and bigger on the pump he could get more but he claims water will be nasty and it will cost thousands more. Prob going to get a 500 gallon buffer tank then

If you could some how try to capture some of the exhaust water to reuse it would cut down on you total consumption.

What brand of dyno you bringing into your shop?