I was browsing one of the pressure washing supply website, can’t remember which one. I saw some very large pumps- 20, 30, 40 gpm at 3000 psi, etc. If someone wanted to use one of these pumps behind an engine, how would they build this setup? I assume you would need a large engine putting out several hundred pound feet/horsepower. It reminds me of how the Ford 300 I6 is used in wood chippers, combine belt drive engines, etc. Where would I get the pulley needed to attach to the back of one of these engines and for the pump?
Lol. I’m not sure you understand these numbers and there practicality.
I believe those are mainly for car washes.
They are on the power wash store and I want them all. I still want to build a full flatbed concrete truck that cleans everywhere it drives. Like those little smart car surface cleaning vehicles but better! And totally not worth it especially for me just doing residential concrete 
1 Like
I don’t actually want to use one for work. Lol. I have no desire to drag 1 inch high pressure hose around. Just a cool thing to think about.
2 Likes
I bet if you had a 40 gpm gun in each hand you could fly like iron man.
I bet you’d fly real high too that jetski is probably only 70ish hp at most right? To run 40 at 3k psi youd be around 110hp for gas so I bet youd get to moving quick
1 Like
The one on the pic is 140hp I think. There are a few at 300+ hp
1 Like
They’ve gone silly with the hp of these things, my brother has a 2008 Yamaha gp1300r about 170hp, it’s complete overkill for your average person, it’s just unusable other than straight line blasts on a calm day. Thers some talented riders out there throwing these things around like kids bikes. With 300hp Ide imagine you would pick your days out on the water carefully lol.
Yeah I knew some of them were up there in hp but I figured your average ones would be less than 100. The more you know but I’d be real scared riding 300 hp across our lake on a jetski
Pansy government makes them limit them to 67mph… tuned they will run into the 80s!
1 Like
Here’s an older post where I added some pictures of some 50 gpm pumps they used at a jobsite where I worked. I use to work as a Boilermaker and did a lot of work in power plants. They always wash down the inside of the boilers to get rid of fly ash before we’d go in to make repairs. From what I’ve heard the engines are about 2000 hp. The engines are big diesels. Probably comparable to a semi engine or large tractor. They have quite a few mounted on semi trailers. They feed them with 2" supply hose and use 1"-1.5" pressure hose.
Here’s the link to the pictures. Bidding on City Jobs - #45 by marinegrunt
1 Like
That’s crazy. I found a company that sells pumps like that. Hammelmann Process Pumps. This one outs out 789 gpm at like 50,000 psi.
1 Like
Those little gp1300r 2 strokes fly, my old one was just a bit slower than my mates 260hp supercharged seadoo and the father in laws 300hp, they were much better at low rpms and towing ski biscuits but the powerband on the gp was cool.
I be interested to know the gpm output of a 300hp jet drive, it would probably suck a swimming pool dry pretty quickly lol
1 Like
They absolutely got up and went, they only weigh something like 300kg, sounded good too when fully opened up, I could never enjoy it though we only ever took it out in the ocean I was afraid of smacking a wave, it blew past my 5.5 meter surtees hardtop at the time like it was standing still.
300hp jet drive would have to be a few thousand gpm, it’s just ridiculous what these things flow.
Heres a link to some people trying to figure it out. Without major research no one has found a scientific number but there are some big numbers thrown around in that link
1 Like
What in the hell could that possibly be used for?!
I know, right?! Hammelmann has quite a bit of marketing on their website about using it to cut metal, though I still doubt that could require 789 GPM. I guess it depends how big a piece of metal you are cutting…
I would absolutely love to wash a house with one of those before I die. Lol
1 Like
