opie2
Well-known member
- Mar 6, 2021
- 2,506
- 184
Again excellent info. I run regular spray tips so i didnt know you could change orfices in the covered tips.My posts have been in reference to the nozzle tip orifice, but you are correct, a foam cannon also has an orifice which can be changed. In both cases, the orifice affects how the motor and pump work.
For a nozzle, if you go too small to boost pressure, you risk overworking the motor and pump, often it will trip a breaker but if you continue doing this, it will blow the thing up. Going too big will relieve the pressure and boost flow, but it doesn't pose the same risk to the machine. Again, this is different to the spray pattern or angle of the nozzle.
For the basic un-shrouded nozzles, you can't swap out a nozzle orifice, rather you replace the whole nozzle. On a shrouded nozzle, you can swap out the nozzle tip. When I did my wall mount with a KHD/10, I found I had to open up the nozzle tips to dial back the pressure, going from a 4.0 to 4.5.
For foam cannon, it works in a similar way. If you use a small orifice on a powerful machine, you will be tripping breakers and burning up your machine. Go too big though and it won't foam properly. The foam cannon orifice is located behind the inlet fitting, to remove/clean/replace, it requires removal of said inlet fitting and to gain access. You really shouldn't need to mess with these unless you buy a different pressure washer. Most low to mid-market machines use the 1.1 orifice, for higher flow machines you should have the 1.25 - 1.5 fitted.
I know most don't like him, but the below link is a very good pressure washer setup resource -
I knew about the foam cannon as i changed my mtm to 1.25 for my gas karcher runs 2.5 gpm. But my little electric ar blue is only 1.4 gpm i think, it still foams fine
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