Increase water pressure
 

I need to increase water pressure in the engine, running a 2 stage pump -16 to the engine, -12 in and out of the inter cooler dumping out the transom and 2 -4 rear intake dumps, is there a restrictor that can be inserted in the AN fitting to accomplish this, thought about restricting the primary side of the -12 fitting at the pump, thoughts ?

What is the pressure now?

about 5-7 lbs at cruise, maybe a little less

Wheres all the experts ..........:helmet:

I have the opposite issue, if I don`t relieve the pressure it goes 20psi+
I`m running the intercoolers off a seperate pickup , just engine off the single stage pump.The intercooler should have at least 10psi.
Somewhere along the way you gotta reduce the diameter of the over board fittings , I have`t found any AN restrictors ..
How`s it idle with the water running thru the intercooler ?

Thanx all I got, sorry .

Idle is good maybe a little fat, reducing the -12 dump will increase psi on the cooler and should increase all around psi, thanks

What are you using for a pickup and inlet hose?

standard bravo through the drive, 1.25 hose to the pump,

Thinking out loud.....maybe put a 15psi (or 20 ?)regulator on intercooler outlet. Will stop water flow thru it idle/low speed and will open once motoring pretty good.when psi gets up to determined regulator psi you choose.

Just thought of something, never used one do I don’t know how reliable, but they make valves with an fittings. This way you can adjust restriction size with s push or pull. :)


https://cimg6.ibsrv.net/gimg/www.off...5fde1dd74.jpeg

That would seem like a possible solution, thanks........right now I have so much water leaving I cant run it on a hose

what did you use for search on this, I could use a fuel regulator ?? 7/10 psi

AN fitting valve , I think.

I see so many rusty fuel psi regulator diaphragms my brain says don't use any fuel regulator as a water regulator. Use a Watts type as they are made gor water , primarily. . There are some adjustable or low psi ones out there.

So at cruise you are 5-7 what speed? and what is the pressure at WOT. The reason I ask is in my set up i have similar pressure at cruise but tons of flow out the back and engine temps stay steady, at WOT pressure is 14-16 and looks like fire hose out the back never runs hot. so i'm happy with low pressure and great flow through the engine.
Are you encountering any issues with the cooling system as is?

Since not sure if aluminum an ball valves reliable for water use maybe get a normall brass ball valve with female npt on both sides and then screw your npt-an fittings into that. :)

55 to 80 makes no difference, like i said previous, I have so much water leaving that I cant run it on a hose, cant keep the strainer full......and I think no flow through the cooler at idle may help the rich idle ?

When the lake water is cold I do have a 5 lb pressure valve on the intercooler and remove it when the water temp goes up, but it has no effect on the overall water pressure at any rpm. whether it is installed or off the intercooler line. Your set up may benefit from an intercooler relief valve as far as pressure, but for sure as far as idle quality
.

Multi stage pumps usually run the strainer near dry when on a garden hose.
the stock bravo pickup hose through the helmet is 5/8 or 3/4”. Too small for a multistage pump imo

I agree with that jd, the perfect scenario would be for the cooler dump to be closed and do an auto open when it reaches 10-12 lbs, that way the strainer could stay filled at idle

I’d try an inline pressure relief going to the intercooler. That’ll help with the rich at start up and idle. Once the pump starts pushing so much water at a given rpm it’ll open it up and start pumping water into the intercooler. You can actually disassemble the in-line pressure relief and add or remove spring pressure to suit your liking. I made mine so it was basically a check valve, but mine was not after the sea pump. Worked great and one of the best parts I was able to run on the hose for more than 60 seconds

Actually got the idea from abones

Went through this last year. You need to restrict it at the dumps. Take your manifold dumps weld them up and drill a small hole in them they only need to bleed off air anyway. Do the same to your engine dumps start out about half the size they are now, then you can work your way up until you get your desired pressure. Unless you know someone with a lathe then they could make some reducers.

I have a machinist that does work for me, thanks for the info

Does engine oil or water temp get warm or hot ? my engines show very little pressure , but lots of flow. Never any heating issues of water temp or oil temp.

Everything stays around normal, water temp around 140-160 and oil around 160-180 push to 190 ....I was taking to Doug about a drive question and he said dont worry so much about the pressure as flow

Before I put in a seperate pickup for the intercoolers I was going to use a 12v shut off valve. close it at idle , open it when on plane .


I still have it , it`s power closed

You have Daytona ignitions right ? I forget, do they have any rpm based outputs/switches ? If do, could use’m for that.

As I have mentioned in other threads. I have 3D printed restrictors for my -AN hose for my manifold dumps and crossover bypass. This is also how I control pressure, I just keep up-sizing the diameter until I'm happy with flow and pressure.What size and how many would you like?
https://cimg9.ibsrv.net/gimg/www.off...b0877c97c2.jpg
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https://cimg2.ibsrv.net/gimg/www.off...e1d3711e48.jpg

While flow is very important remember to keep enough pressure to keep air pockets from forming.

I ran it like this a few hours last yr, no blueing on the headers, I may just install a shut off valve on the cooler dump so I can run it on the hose, and experiment with some restrictors to bring the pressure up a bit

Thanks for all the input....

I had Daytona , HOlley HP now

That mustvhave an rpm based output, right ? If so, use that. :)

I think you got me confused with someone else , I dont have any need for a rpm based output. for what ? I have no idea lol

No biggie. I was going off this. Lol.

this rpm based water flow solenoid was a thought of yours in the past, I thought was present- you did a separate pickup . Warning, i get confused easily. Lol.