I currently am running a 5.5 gpm machine and its great. However I was thinking about building a 4gpm as a backup. Does anyone know if an 6.5 hp motor will do fine with a 4gpm pump? The reason I’m wanting to use an 6.5 is because I already have it sitting in my shop. Thank you
It’ll work for house-washing. You’ll be limited to around 1,700 psi or so.
How much gpm / psi can you get out of a honda 390 belt drive?@infinity
The formula is kicking around somewhere, but from memory, these are the common configurations:
Thank you sir @Infinity. Much appreciated. I’ve been searching. Just so much miss info.
PSI times GPM divided by 1100 equals needed horsepower
So a gx390 should be able to handle 5gpm at 3000 psi no problem?
Honda rates a GX390 at 11.7 horsepower. 5gpm at 3000psi requires 13.64 horsepower, if you divide by 1100.
I’ve seen it advertised as 13 hp but good point.
Of course 4gpm at 4000 psi would require 14.5.