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Message: [QUOTE="Garbage_Mechanic, post: 836568, member: 1610"] Having 35 years of hydraulic experience and some training on the subject, sometimes the whole HPOP pissing match gets pretty laughable to me. The basic measurement of pump performance is displacement. Displacement x RPM [U]generally[/U] indicates flow. In the basic terms we have a fixed displacement piston pump. So many cc's of oil per revolution (on paper) We control the system pressure with a pulse width modulation controlled "leak" in the system. That being said there are many variables that can affect the actual output. Pump efficiency, that is how much internal leakage, flow restrictions on the inlet or outlet, cavitation, oil viscosity are all factors that change the performace of the pump itself. Add to this the variables created by demand of the system (8 little hydraulic cylinders cycling rapidly) and any efficiency issues such as worn injectors, oring leaks and the fact we can program the usage differently and comparing one truck to another is folly. We can compare some similar set ups but from the point of hydraulic testing, there are too many variables [/QUOTE]

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