Pump Configuration

MOTG1

MOTG1

New member
My pump runs fine. I have a 20 hp Honda motor running a Legacy Pump at 3500 psi and 5.6 gpm. Am I able to replace that pump with one that runs 8 gpm? Too much for the motor? I thought I saw some units for sale with the equivalent motor and 8 gpm.
 
With the limits of the engine horsepower, you could do 8 @ 2,500.
 
You could run an 8 gpm pump just fine. However, your max psi will likely only be between 2,000 & 2,500. Someone will likely chime in with more accurate specs or the formula for figuring this out.
 
Waited one minute too late to respond...I would take Russ' specs! Been thinking of putting an 8 gpm pump on a Vanguard 18 hp just for washing houses and condo complexes.
 
I was told that a 27 hp kohler would replace a Honda engine. If you are wanting to run 8 gpm at 3500
 
You can install a bigger pump pulley and slow the pump down a bit and run 3000 psi at 7 gpm and still be fine. Your pump will turn slower but should last longer and even at 7 gpm, you will notice a big difference compared to the 5.6.
 
Also you could run pump at full speed (8gpm) and set your trapped pressure unloader to cycle at 3500. Use nozzles for 3500 at 6-6.5 gmp in your surface cleaner and use larger nozzles (for 2500 at 8) to rinse with. If you need extra pressure at times, you can have a nozzle for 3500 at 6 gpm. The unloader, if set right, will bypass the extra water.
 
After looking more...the "infinity symbol" is used in a few places. For example: GPM ∞ PSI / 1460 ∞ 1.5

What is that supposed to mean? Is it multiply? I guess I didn't do as well in math as I thought...
 
Russ Johnson said:
Yeah, it must be a European thing...I guess our "x" is just not complete.
Click to expand...

Funny, those europeans always over doing things making it mor complicated than it needs to be.
 
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