Quote:
Originally Posted by plainpainter
Couldn't one just adjust your unloader to the correct pressure - and once achieved - back off the throttle until the engine just 'meets' the required output? I mean heck - a car with a 250hp engine, only uses 18hp to cruise at 55MPH.
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Adjusting the unloader will also adjust the flow of the machine. If you want full gpm and lower pressure, then you need to make adjustments with larger orifice tips, or an adjustable wand.
Back off the throttle and you reduce power to the pump which lowers both gpm and psi. It also raises the chance for pump failure on a direct drive unit because of heat transfer from the engine to the pump.
If you were to do it in the way you mentioned, adjusting the unloader and then adjusting the throttle you would limit the machine quite a bit. May as well use a garden hose from there.
Higher water volume packs a bigger punch and moves dirt faster. Not as damaging as psi. A higher volume machine with lower psi will get the job done quicker and save time on the job.