Join Date: Dec 2019
Location: West Boston suburb
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
I suggest you split the water pump from the engine so you can definitively trace the issue to either the engine or washer.
As for the water pressure / water volume spec, my experience is that of the two the volume is more responsible for speed of cleaning than the pressure.
I typically use 1500-1700 psi to clean whatever.. increasing to around 2200 psi for hard plastic or other hard surfaces.
By running at only the pressure you need leaves enough engine headroom (horsepower) to allow increased nozzle sizes - which results in wider coverage, which equals quicker cleaning.
For instance, at 1700 psi my 7 hp unit can easily employ a 4.0 (I think the unit came factory with 2.5 nozzles, which was capable of barely 2700 psi).
I've kept records of nozzle size vs pressure vs rpm, which I can share if you're curious.
Last edited by Melson; 02-13-2020 at 06:18 PM.