You can determine the maximum cleaning units of an engine then divide it by the psi or gpm
Gas engine hp x 1100
Diesel hp x 1250
Electric motor hp x 1430
Hydraulic motor hp x 1700
For example if you are looking at a 20hp gas engine the formula is 20 x 1100 = 22000 cleaning units if your more interested in the psi lets say 3500psi you can get up to 6.285 gpm with that engine at that psi or if you are more worried about gpm than devide that number by the 22000 and it will tell you the maxium psi an engine can produce at that gpm
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