ECO-3M Piston Air Engine

ECO-3M Piston Air Engine

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Our quiet piston motor produces high torque at low RPM, eliminating the need for a gear reducing transmission. Its lube-free, durable design eliminates the need for oilers.

Autoquip couples the high efficiency piston motor with our patented dual-mode Closed Loop RPM Control that monitors the flow rate of air to the piston motor and adjusts output pressure as the flow changes. The net result is a more constant RPM, regardless of required mixing torque. Our systems are offered in catalyst or mix tank configurations.


  • Standard #3 size air motor. Other sizes available for special applications.
  • Highly efficient piston design consumes less air
  • Aluminum, bronze, steel and plastic components
  • Smoother and quieter operation
  • Closed loop speed control with optional regulator
  • Lube free design eliminates the need for oilers
  • Durable cam design provides long life
  • Tank conversion kits available for most agitation applications



  • Temperature Range: 14ºF to 176ºF (-10ºC to 80ºC)
  • Height: 8.25”
  • Diameter: 8.0”
  • Weight: 8.4 lbs