Quote:
Originally Posted by Windows R Us
So theoretically, I could get my two 4gpm direct drives running well, connect them together, throw a hotbox on and have 8gpm, 3500psi and hot water. Then all I would need is higher rated hoses, guns, and reels. Sound right?
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As I see it, the biggest problem you will have is supply. Two machines drawing 4 gpm at the same time would be a problem at some homes I do. (99% residential with 8 gpm/3000psi.) Many times, a customers city water supply will not keep up with 8 gpm, so I usually carry 75 or so gallons in my 300 gal tank as a buffer. If the flow is low, I will allow the tank to fill while I get set-up. Sometimes, you have to give it quite a head start.
In fact, insufficient water supply may be the reason you are having problems with your machines now. Starving a pw is never good for it. Direct drive pumps, because they are spinning at the same speed as the engine (3400 or so RPM) don't pull water too well. They need the supply pushed. Belt or gear drive pumps spin at 1/2 engine speed, so they will draw much better - either from a hose bib or a tank.
Having said all that, to answer you question directly, most likely, your guns/hoses and reels are rated to 8 gpm. The psi does not change, only (!) the volume.