a positive displacement pump will do as you say. An impeller based pump changes efficiency under restriction and the load is reduced. A perfect example is a vacuum cleaner. Running with a clean filter/bag, and an open clean hose, the sound it makes is a medium deep whine. If you cap off the intake (or exhaust) the sound increases in pitch (because they are universal motors (brushes not synchronous) the motor speeds up because the load goes down. The fins on the turbine just spin the same air over and over with much less work being done. It seems wrong, but isn't. Jim
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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