Why would I be getting 5 gpm out of a 8gpm rig?

[Bret_Mayo]

@Pressure_Wash

Ditto on checking unloader. You could be bypassing your flow.

Other that some drips I’m not getting water flow out of the bypass when the triggers pulled

[Bret_Mayo]

@housewasher

very easy to do, just get one of those gauges that wrap around the spark plug wire to tell you what your rpm are, then just adjust the govern screw until you get the rpm’s needed.

Do you happen to know the name of the gauge?

[Pressure_Wash]

Did you test with open hose? No gun.

[Bret_Mayo]

@Pressure_Wash

Did you test with open hose? No gun.

Yea still 5-6 GPM

[Kiss4aFrog]

@Bret_Mayo

Do you happen to know the name of the gauge?

If you know of someone with a digital timing light the tool will read out the rpm. Just need to clamp it onto the spark plug lead.

[Kiss4aFrog]

@John_T

I know that the RPM’s of the engine and the pulley size if it’s a belt driven Powerwasher does make a difference in the PSI to a pump but I’m not aware of it affecting the GPM’s of the pump.

The pressure and volume of the pump are at a given RPM. If the RPM is less then the RPM it’s rated at then the pressure and volume both will be less. To take it to the extreme, think of how much volume you’d get at idle ???

[John_T]

@Kiss4aFrog

The pressure and volume of the pump are at a given RPM. If the RPM is less then the RPM it’s rated at then the pressure and volume both will be less. To take it to the extreme, think of how much volume you’d get at idle ???

I didn’t realize the volume is affected by RPM’s. Since we always run our machines full tilt I never experience a lack of volume except when there was a clog,low on water or air was getting into the line. Thanks for the info. It makes sense.

[cmturner]

When we got our pressure pro in the set screw on the throttle cable was loose so even with moving the lever all the way up it wasn’t actually opening it up like it should of. It actually took me a few days to realize that it wasn’t a fully opened throttle since it was our first “big machine” once we figured that out I was blown away!!!