Compressor CFM actual under pressure.

67 I was not interested in using electricity very much in my pole barn shop. It is out back and routing a high amp 220 run 200 feet from the main and the corresponding fees and certifications associated.

Basic concept:

Use the factory tank pressure switch which is already set to be on at 90 and off at 140, I adjusted for 85 - 150. When it kicks ON, I use that to trigger a timer which engages the starter for 12 seconds and maintains a relay to hold open a head air pressure relief solenoid on the output of the compressor B4 the check valve (3/4" plumbing). SO while the engine spools up it has no head pressure on the compressor.

The factory pressure switch being on the duration of 85 - 150 psi maintains a relay open while engine is running and closes the relay which grounds the kill switch on the engine when the pressure switch goes off subsequently killing the motor and turning off the system circuitry.

I have a switch in the shop that activates the system power, excluding the main starter leads it is all very low ampers.

There you have it. Once the engine is warmed up thru one cycle, the system operates completely automated. Simple as heck and works like a charm. That 11 hp harbor freight engine cost 302 dollars to my door. The Eaton compressor is USA made and cost less than 500 to my door. It is rated for a 5 HP electric motor.

About 89 times better than that crap where the engine runs all the time and revs up and down and uses a centrifugal clutch pulley triggered by pressure actuated throttle mumbo-jumbo.