Gx390

C

Chris Tharpe

New member
what RPM does the 13hp honda gx390 motor shaft spin if using a direct drive pump. I have one and I am thinking about getting a pump for it that will flow about 5.5 at 2200-2500psi. Can this be done?
 
LSPW01 said:
I believe they turn 3400 rpm. All of the direct drive pumps I have seen max out at 4.5 gpm.
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Thats what I just found out through google. I have no problem going to a decent belt driven unit and making a base-plate for it to work properly. If i can get one to work then I will take the other motor and setup it exactly alike and run them together for rinsing and gum removal with the aid of a good hotbox
 
mobilewashpros said:
what RPM does the 13hp honda gx390 motor shaft spin if using a direct drive pump. I have one and I am thinking about getting a pump for it that will flow about 5.5 at 2200-2500psi. Can this be done?
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The Honda GX390 operates at 3,400 RPM. AR makes a direct drive that is rated 5.5 GPM @ 4,000 PSI.
 
We primarliy used these machines for car lots before and now only use one of them for rinsing while another is cleaning with the bigger unit. I dont see it to be very cost effective to run it with a gearbox in my situation because soon we will eliminate them from the trailer and the motors will be used for something else around the house. I could build a mean 2' or 4' clear water pump out of one of them and who knows I bet a 13hp weed eater on wheels would be cool to see

810f250 said:
Have you considered a gearbox driven pump for your GX390, it may offer better pump longevity, at 1450 rpm input.
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I want to keep both machines at around 4 gpm because we still wash cars at one lot and running 7or 8gpm at one time from one gun would eat up all profit in extra costs of water. The main thing i am wanting to do is to setup these units for both cases, we can idle the motors down for the 30 minutes were doing cars then run them full tilt when doing our other accounts. This is my last lot we wash at and I would quit them but it nets around 28k per year. Thats hard to just up and quit unless we just run out of time and cannot get them done anymore
 
mobilewashpros said:
I want to keep both machines at around 4 gpm because we still wash cars at one lot and running 7or 8gpm at one time from one gun would eat up all profit in extra costs of water. The main thing i am wanting to do is to setup these units for both cases, we can idle the motors down for the 30 minutes were doing cars then run them full tilt when doing our other accounts. This is my last lot we wash at and I would quit them but it nets around 28k per year. Thats hard to just up and quit unless we just run out of time and cannot get them done anymore
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What kind of system do you use to prevent spotting on the cars??
 
Chris my Kohler rep mentioned if I had adequate ventilation and the engine is well sized for the application and could go as low as 3000rpm.

He was not to concerned with the cooling but the oil pressure for the hydraulic lifters.
 
I agree thats also what i have been told Chris, but the extra wear and tear is worth it in savings in water as well as hassle of refilling

Christopher said:
I was always told to run the pressure washer engine at full throttle because it is air-cooled and slower speeds under a load might not cool down enough, just a FYI.

I could be wrong but that is what I was told.

Some cool ideas Chris!





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