Okay, so I was hoping to build a (honest) 20-ton log splitter powered by an (honest) 5hp electric motor. So I played around with the oft-recommended calculators on surpluscenter.com, and according to these calculators ("Calculated for electric motors. Double this figure for gas engines.") a 5hp electric motor can produce 3gpm at 2550 psi without exceeding its rated output. Happily, the calculators tell me that at that pressure a 4.5" cylinder will produce just over 20 tons of force. Looking at the two-stage log splitter pumps offered on surpluscenter.com, I found that their 9-12446 MTE 13gpm pump has a high pressure stage flow of 3gpm. So I could use a good 5hp electric motor, that 13gpm MTE pump, and a 4.5" cylinder to get reasonably fast log splitting up to 20 tons. Voila, right? Then I called product support at surpluscenter.com to confirm my thinking, and happened to mention I intended to use a 5hp electric motor to run the 13gpm pump. The conversation went something like this: Support Guy: "5hp isn't enough. You need at least 6.5hp*." Me: "But I used your calculators." Support Guy: "They're just estimates." *(To my knowledge, a 6.5hp electric motor, if it exists, would be exceedingly rare. So, 7.5hp.) So, hmm, is it kinda like Pirates of the Caribbean, "They're more like guidelines?" Don't get me wrong, he may be absolutely right and it may be that I can't get 20 tons out of that setup. The problem is trying to find out for sure. A good motor will be my largest single expense in building a log splitter so I surely don't want to get it wrong. I've spent hours searching forums trying to find out. While there is some discussion of electric splitters here and there over the years, it is rarely (in what I could find, anyway) accompanied by complete descriptions of working setups. Someone will say they or their cousin has been happily using an electric for years and it does everything they need and they may mention some details, but not their whole setup--actual motor type, pump size and hi/lo flow numbers, cylinder size, etc. Or they do provide some numbers which disagree with both the calculators and the support guy, and even I am skeptical. Not sure where to go from here. I would appreciate thoughts and suggestions but would particularly welcome hard facts based on experience. Which is what I thought I was getting from the calculators.