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Build an 8gpm on a 13 hp - Supplies & Equipment - Pressure Washing Resource

Question:

I have a 13 hp honda 4 gpm machine. Im looking to get an 8 gpm pump on there. I will only be using it for house washes i have another machine ill be using for concrete… my question is what exactly do i need to make the switch? What pumps will work? And do i need a gear reducer or something to go between the pump and the engine? If so which one? Any help is greatly appreciated thanks

Answer 1:

This is a guide from AR 13hp max out is 7GPM @ 2700PSI. General rule is big motor small pump… Big pump small motor = problems.

Answer 2:

That is not a general rule, and isn’t great advice.

Answer 3:

Hi, I’m a fabricator who does a lot of work on pressure washers in New Zealand. ARs table is there work not mine, if you know better than them please reference your work. Be it a boat, car, plane, or power washer if you have an engine too small for the load, you’ll have problems. Now if you know something the rest of the engineering world doesn’t about the physics of an over load, I’m all ears. I’ve spoken to enough users and seen enough big pumps on small engines over the past 15 years of doing this to satisfy myself that I’m OK with what I said.

Answer 4:

I like how the chart says my 21hp GX 630 will power an 8.5/3500 pump. Granted it’s only using 17 With the 5.5 I have right now, but still.

Answer 5:

Im looking for actual pumps with part numbers so i know which ones will fit my machine and i need to know if i need a gear box or gear reducer. Pretty much what pump will go on my 13 hp honda gx 390

Answer 6:

You’re not going to like the SH strength with low pressure/high volume. If anything shoot for a 5gpm/2500 or something. Then again, I’m only 1.5 years in this, ask the other guys.

Answer 7:

I’m sure I know more than some engineers, less than others. I’ve got a few more years experience than you, but that isn’t your fault. Your advice is still wrong. A bigger pump puts no more strain on an engine than a smaller one. Probably less, as a bigger pump on a smaller engine produces more gpm, not pressure. AR is not really recognized as a decent pump for professional contractors. Stick around. Intro your self. You’ll learn a lot here.

Answer 8:

Are you familiar with the 8 gpm 13 hp build?