EMAX Silent Air Industrial Plus 5 HP 80-Gallon Two-Stage Air Compressor, 19 CFM 230V Single-Phase, ESP05V080I1

The EMAX Silent Air Industrial Plus ESP05V080I1 is a 5 HP, 80-gallon, two-stage vertical air compressor built for shops that run air all day. It delivers 19 CFM at 100 PSI and 17 CFM at its 175 PSI maximum, enough to keep impact tools, sanders, and spray equipment supplied without the pump cycling constantly. Power comes from a 230V single-phase open-drip-proof motor on a fixed-speed start, drawing 26.45 full-load amps and sized for a 40-amp breaker.

What sets this unit apart is the patented Silent Air™ intake silencer, which brings operation to at or below conversational volume — up to 50% quieter to the human ear. Unlike sealed cabinet compressors, the silencer stays externally serviceable and keeps the pump accessible. Inside, a pressure-lubricated, 100% cast-iron pump (model APP2I0524TP) circulates filtered oil to every bearing point, and the assembly is rated for an estimated 70,000-hour pump life. The compressor is ETL, ASME, and CRN certified and is rated for continuous-run duty.

Silent Air™ Noise Suppression

Intake is the loudest source of compressor noise, so the patented Silent Air™ silencer targets it directly with noise-reducing baffle plates and high-capacity filter media that also delivers up to 1000% more filtration than a standard setup. The result is operation at or below conversational volume without locking the pump inside a cabinet that blocks service access.

Pressure-Lubricated Cast-Iron Pump

A gear-driven oil pump mounted to the rear of the crankshaft generates positive oil pressure, feeding a continuous flow of oil to every bearing point. The crankshaft and connecting rods are rifle-drilled so oil travels directly to high-friction wear points, while a spin-on automotive-style oil filter keeps that oil clean. An adjustable regulator tunes oil pressure across the RPM range, and a liquid-filled gauge lets you monitor it at a glance. Unlike splash-lubricated designs, pressure lubrication delivers oil precisely where it is needed in continuous-duty service.

100% Cast-Iron Cylinders

Major pump components — crankcase, cylinders, cylinder heads, connecting rods, crankshaft, and high-pressure piston — are cast iron, with no aluminum sleeves where many pumps in this class use aluminum beneath the paint. The cylinders are CNC-machined for flatness and a precise bore, then precision-honed to reduce oil carryover and extend ring life. Deep cooling fins maximize surface area for high-duty-cycle operation, and deep-bored, threaded holes hold head torque for long-term gasket durability.

Cast-Iron Cylinder Heads & Disc Valves

Solid cast-iron heads avoid the gasket failures common to aluminum heads and hold a secure seal without retorquing. They use CNC-machined concentric-ring disc valves — precision surface-ground for sealing and longevity, and far simpler to service than feather or reed valves: remove the retainer, lift the valve to inspect, and reinstall in minutes. The valve train is engineered to accept an automatic head-unloader system for high-duty-cycle use.

Rebuildable Piston & Connecting Rod

Cast-iron high-pressure pistons are designed to withstand heavy loads and resist the cylinder scoring that ends aluminum pistons. The CNC-machined solid cast-iron connecting rods use replaceable bearing inserts and wrist pins, so the rod assembly is fully rebuildable rather than throw-away. A four-ring piston design — two oil-control rings and two compression rings — maximizes sealing and minimizes oil carryover. On the two-stage pump, the low-pressure piston is aluminum, which operates under low stress for balance and efficiency.

Heavy Cast-Iron Flywheel

The cast-iron flywheel adds mass that stores kinetic energy, reducing amp draw and overall energy consumption. The 5 HP unit runs a 16-inch flywheel with two B-style groove belts and six large cooling fins that pull air across the pump for cooling. The larger belt contact area extends belt life compared with narrow single-belt drives.

Dual-Bolt Belt Tensioner & V-Belt Drive

A dual-bolt belt tensioner makes adjustments precise and repeatable while holding proper alignment — no pry bars required. The multi-belt V-belt drive runs B-style belts for more grip surface, lower belt tension, and reduced noise and vibration, all of which extend belt and bearing life.

Pump Riser Cooling

A pump mounting-plate riser lifts the pump to allow 360-degree airflow from the flywheel across the oil reservoir, and lets air move underneath the pump for maximum cooling.

Electric Auto Drain

A dual-timer electric auto drain expels moisture and condensate from the tank automatically. The interval is adjustable from 1 to 45 minutes, and you can set how long the valve stays open. An included air muffler keeps the discharge quiet.

Every ESP05V080I1 carries a 1-year standard warranty covering defects in materials, workmanship, and parts from the date of delivery, including one year of warranty labor from an authorized technician. EMAX covers ground freight on warranty parts for the first six months.

Coverage extends to a full 5 years — plus a Limited Lifetime warranty on the pressure-lubricated pump — when you register the compressor and enroll in the EMAX SMART OIL™ auto-ship maintenance program using the EFKIT008AWBS service kit. The Limited Lifetime pump warranty is non-prorated with no hour limit. Extended coverage depends on following the scheduled maintenance: change the factory break-in oil within the first 70 hours, then service with EMAX SMART OIL™ every 6 months or 1,000 hours, whichever comes first.

What electrical service does it need?

The compressor runs on 230V single-phase power and draws 26.45 full-load amps, so EMAX specifies a dedicated 40-amp breaker. Peak starting (locked-rotor) current is 135 amps.

How loud is it?

The patented Silent Air™ intake silencer targets the loudest source of compressor noise, bringing operation to at or below conversational volume — up to 50% quieter to the human ear. The silencer stays externally serviceable, unlike sealed cabinet enclosures.

Can it run continuously?

Yes. The unit is rated for a 60% duty cycle and continuous-run operation, and the valve train supports an automatic head-unloader system for high-duty-cycle use, which lowers motor amp draw while the pump is unloaded.

• Piston Compressor Manual (PDF)
• Warranty Statement (PDF)