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I have about 60 or 70 air compressors that are on the back of my mechanic's trucks. The are all gas powered (except for a couple which are vehicle engine driven). I have the following configuratons.... 1) Unloader that leaves the engine running the same speed no matter what and it simply keeps the compressor from building more pressure. 2) Same as above, but the unloader controls the engine speed (Honda). They simply loosen the screw that holds the center of the manual speed lever so it moves freely, then ran a small linkage to the unloader valve. Works great. 3) I/R and Kohler has the same set up above in #2 4) Electric clutch with a pressure switch, same goes as #1, engine always wide open. 5) Vehicle Engine driven. Electric clutch on compressor, solenoid on vehicles throttle, and truck engine speeds up when more air is needed. Same with the hydraulic crane with the Engine driven hydraulic pump. 6) Old SpeedAir that has two pop off valves side by side and the engine and compressor always runs. When excessive pressure builds up they simply vent it off. Everyone's favorits are the Honda and the Kohler Magnums.
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