I want to build a 10GPM machine. Which pulleys to use?

Let me see what I can do tomorrow. I'm looking at a 4" 3 groove engine pulley and a 11" 3 groove pump pulley. Going to need a good sized base to accommodate the pump pulley. Top that off with some BX belts, and you'll be good.
 
Keep in mind the bigger the surface area on the pulley's the longer and better the belts will last. I have a legacy 10 gpm pump setup, but my engine is a liquid cooled diesel that runs at 3000 rpm max. I only have a 2 pulley setup and bx belts with 800 hours no problems thus far. Using North American belts also makes a big difference vs chinese belts.
 
The price is good. I have one more question. The description of the specs says the following: Maximum Volume 10.0/12.0 gpm Max. Discharge Pressure 3000/2500 psi Maximum Pump Speed 1450/1750 rpm Maximum Inlet Pressure 125 psi Does that mean that I get 2500 psi /12gpm @ 1750 rpm VS. 3000 psi 10GPM @ 1450? The logic says the pressure should go up with RPM, no? Or am I confusing something here? Which RPM should I go with ? Thank you
 
Do you need the high temp seals?

If not save your money and get the legacy

http://www.powerwashstore.com/P/2056/LegacyHDPumpGXSeries10.4GPM-3600PSINoGX1036R.2

To answer your PSI/GPM question, in my experience it takes more RPM for GPM then PSI. I can achieve 2000 psi at idle on my engine with a number 5 nozzle which is 3.5 gpm. I put a bigger nozzle in at the same rpm my PSI drops as my GPM increases. What do you need more PSI or GPM? Set your RPM based on this.
 
The price is good. I have one more question. The description of the specs says the following: Maximum Volume 10.0/12.0 gpm Max. Discharge Pressure 3000/2500 psi Maximum Pump Speed 1450/1750 rpm Maximum Inlet Pressure 125 psi Does that mean that I get 2500 psi /12gpm @ 1750 rpm VS. 3000 psi 10GPM @ 1450? The logic says the pressure should go up with RPM, no? Or am I confusing something here? Which RPM should I go with ? Thank you

That is the manufacturers maximum rating. If you're going to run it at 10 gpm, you're allowed to go to 3,000 psi. If you choose to run 12 gpm, the most you're allowed is 2500. It's all about stress on the materials and longevity.
 
The legacy pumps all have high temp seals.
 
Benjamin, I plan on building two men rig to wash houses and do single spinner for flat work so I would imagine I need more GPM.

The pump I linked is 10.6 gpm at 3600 psi which is a better combination for flatwork then the general pump. I have a cat, general, and legacy pumps, would go with the legacy pumps from here on in and I have been building my own pressure washers for 8 years now.
 
*FROM THE PWI ARCHIVES* here's an easier to use formula..
(..you can use it backward as easily as forward.)

GPM x PSI x .0007 = HP continuous

continuous HP is what electric motors and most diesel engines are rated for,
and gas engines only give about 75% of what they are "rated", so..

10gpm x 2500psi x .0007 = 17.5
..and a 23hp = 17.25, so use 23 or better gas engine HP.

when you have an engine and pump, and you want to know how much pressure you can get..
use my formula backward..
23hp x.75 / .ooo7 / 10gpm = 2465 psi
 
*FROM THE PWI ARCHIVES* here's an easier to use formula..
(..you can use it backward as easily as forward.)

GPM x PSI x .0007 = HP continuous

continuous HP is what electric motors and most diesel engines are rated for,
and gas engines only give about 75% of what they are "rated", so..

10gpm x 2500psi x .0007 = 17.5
..and a 23hp = 17.25, so use 23 or better gas engine HP.

when you have an engine and pump, and you want to know how much pressure you can get..
use my formula backward..
23hp x.75 / .ooo7 / 10gpm = 2465 psi

or you can just put your numbers in here, and the hp required will show up on the right http://www.barens.com/cgi-bin/calc
 
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