The Most Compact Mobile Air Compressor Available - Underhood™ 70

UNDERHOOD™ 70 Air Compressors


The VMAC UNDERHOOD™ 70 air compressor system is the best choice for customers who have concerns with space and weight on their service trucks.  The powerful rotary screw air compressor is ideal for operating small to medium sized air tools with high air demand.

Truck Mounting Kits VMAC engineers truck mounting kits for the easiest possible installation.  Working closely with leading truck manufacturers, VMAC ensures that mounting kits do not affect OEM warranties. Mounting kits available for:

  • Ford F-250 to F-550 Power Stroke Diesel
  • Ford F-250 to F-550 Gas
  • Dodge/RAM 2500 to 5500 Cummins Turbo Diesel
  • Dodge/RAM 2500 to 5500 Hemi Gas
  • GMC/Chevrolet 2500HD to 3500HD Vortec Gas
  • GMC/Chevrolet 2500HD to 3500HD Duramax Diesel
  • International Terrastar Maxxforce 7 Diesel
  • Sterling 4500-5500 Cummins Diesel
  • Toyota Landcruiser 4.2L Diesel
  • Jeep J8 2.8L Diesel

For a complete application list, click here.

Applications -  Common jobs that use the UNDERHOOD™ 70 air compressor:

  • Commercial tire services
  • Utility servicing
  • Heavy equipment repair
  • Sign installation
  • Oil and gas mobile mechanics

Commonly used air tools – VMAC UNDERHOOD™ 70 air compressors can be used for:

  • 1” impact wrenches
  • 60 lb jackhammers/pavement breakers
  • Backfill tampers
  • Vertical/horizontal grinders
  • Sanders
  • OTR tire inflation
  • Many other air tools/applications



Free up to 25 cubic feet on your truck body

VMAC UNDERHOOD™ 70 air compressors free up to 25 cubic feet on the truck deck because the air compressor mounts in the engine compartment.  In fact, no components get installed on the truck deck which ensures a clean and professional looking truck, and space for other equipment, tools or materials.

Reduce truck GVW by up to 260 lbs

VMAC UNDERHOOD™ 70 air compressors reduce truck GVW by as much as 260 lbs. Choosing a lightweight air compressor means you’ll be able to add more tools and equipment to your truck, carry more materials, or take advantage of better fuel economy.

Up to 70 CFM. 100% of the time. 

VMAC UNDERHOOD™ 70 air compressors use patented rotary screw technology designed to run at 100% duty cycle without stopping, so operators don’t have to wait for their air compressor to fill up an air receiver tank.  This maximizes tool performance and eliminates downtime.

Avoid frustrating breakdowns and maintenance issues

VMAC UNDERHOOD™ 70 air compressors are powered by the truck’s engine.  Because they don’t have their own engine that needs constant maintenance, less time and money is spent on fixing engine issues and more time is spent on jobs making money.

Work in any climate

VMAC UNDERHOOD™ 70 air compressors are proven to work in any extreme climate, chosen as the air compressor of choice in arctic and desert environments.  The compressor is protected under the hood of the truck, ensuring it starts in any climate every time.


Rotary screw compressor mounts under the truck’s hood with an engineered bracket and belt drive system.

Liquid-to-liquid cooler integrates into truck’s cooling system and mounts under the radiator.

Digital control box and air on-demand throttle control mount in the cab.

Separates compressor oil from compressed air and mounts safely to truck’s frame rail.


Air Compressor Output: Up to 70 CFM* @ 100 psi (175 psi max)
Air Compressor Type: Belt-driven, 100% duty cycle, VMAC oil-injected rotary screw
Total System Weight (wet): Approximately 150 lbs (68 kg)
Control System:
  • LCD display
  • Service notifications
  • Error message
  • System temperature
Throttle Control: Variable speed; adjusts truck engine speed automatically to match air demand.
Optional Model (VR70G): Includes Standby Mode which reduces vehicle idling time; adjustable parameters (see UNDERHOOD70-G for details)
Safety System:
  • Electro-magnetic clutch
  • Compressor over-temp sensor
  • Automatic rapid blow-down valve on tank
  • 200 psi pressure relief valve
  • Truck drive disable circuit on throttle control
  • Truck park brake safety shut-off switch on control box
Warranty: Two years on all major components; VMAC air-ends are covered by VMAC’s Lifetime Limited Warranty; for details, visit

*Actual maximum CFM output of the air compressor varies by vehicle application. See Application List for details.