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
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