The Quincy 451CS80VCB is an 80-gallon, 5 HP two-stage compressor designed for shops and garages with 230V single-phase power—a major advantage over comparable three-phase models. Its factory-installed magnetic starter includes the contactor and thermal overload protection, so the motor protection and switching system are already integrated into the compressor rather than requiring a separate starter purchase and installation. The unit uses a cast-iron two-stage pump, operates at 175 PSI, and is rated for a 100% duty cycle, making it suited to sustained air demand rather than intermittent use.
The two-stage pump compresses air in two steps, cooling it between stages with a high-efficiency finned-tube intercooler. That reduces the heat entering the second compression stage and helps the compressor maintain its 175 PSI rating during extended operation. Splash lubrication, industrial-class bearings, a large balanced cast-iron flywheel, and a cast-iron cylinder design support the pump's continuous-duty operation, while the aluminum head helps dissipate heat. Quincy states the pump is designed for more than 50,000 hours of service. Stainless steel reed valves also provide corrosion resistance in an environment where moisture is an unavoidable part of compressed-air production.
This compressor is a practical fit for independent automotive shops, serious home garages, and other facilities limited to single-phase electrical service. Its vertical 80-gallon receiver uses roughly 37" × 24" of floor space while standing approximately 74" tall, making it a good choice when floor space is more limited than ceiling height. The unit requires a properly sized 230V single-phase circuit for the 5 HP motor, with electrical sizing determined according to the installation and local code. The 3/4" tank outlet provides the air connection, while drying, filtration, regulation, and shop piping are handled separately.
What single-phase actually buys you
A phase converter is another machine to buy, site, and eventually repair. Skipping it is worth real money and real floor space. The trade sits on the supply side: a 5 HP single-phase motor pulls a heavier starting current than the same horsepower spread across three phases, so the circuit feeding it has to be sized properly and the panel has to have room for it. Give your electrician the three figures that define the load — 5 HP, 230 Volt, 1-Phase — and let them size the circuit for your run length and local code. Ask us and we will put the manufacturer's current figure in writing.
The starter, and why it is not a trim item
A magnetic starter does two jobs on a motor this size. It switches the heavy current through a contactor instead of making a pressure switch do work it was never designed to do, and it carries a thermal overload that drops the motor out before a struggling machine cooks its own windings. On compressors sold without one, that is a purchase, a mounting job and an electrician's visit that most listings never mention. On this one it is already done.
Will it fit?
The tank stands upright, which is the layout to choose when floor space is the constraint rather than ceiling height. The machine occupies roughly 37" by 24" of floor and stands 74" tall, so measure the height of your intended corner — including any shelf, roller-door track or ductwork above it — before the truck arrives, and leave working room around the belt guard, the sight glass and the drain.
The floor matters as much as the ceiling. This is 680 lbs concentrated on a small footprint, and a tall tank on an uneven or soft slab will work its mounts loose over a season and transmit far more vibration into the building than it should. A flat, solid, level pad is a customer responsibility and it is the least expensive reliability you can buy.
Plan the air line too. The tank outlet is 3/4", and there is no aftercooler or air dryer on this machine, so if your work needs dry air the drying and filtration are separate items in the run.
Continuous duty, and what the two stages are for
This pump is rated for a 100% duty cycle. That is not shorthand for "powerful"; it means the machine is built to keep pumping rather than being scheduled around a cool-down. Splash lubrication, a cast-iron cylinder pair and a large balanced flywheel angled to move air across the pump are what make that claim survivable, and the industrial-class bearings decide how long the pistons stay round.
Two-stage compression is the other half. Air is compressed once, passed through a high-efficiency finned tube intercooler, then compressed again. Cooling the charge between stages is why the machine holds 175 PSI as a working condition instead of a strained maximum, and why carbon does not build up in the head the way it does on a single-stage pump run hard. Cooler air means longer valve life, and valves usually decide when a pump stops being efficient. The head is aluminium for heat dissipation and the reed valves are stainless steel — a corrosion decision as much as a flow one, because a compressor makes water every day of its life. Quincy states the pump is designed for over 50,000 hours of service and that the unit is built in the U.S.A.
About the delivered-air figure
We are not going to headline a flow rating for this model. Our specification block records the pump at 17.2 cubic feet per minute rated at 175 PSI, but that value reaches us in a field whose unit is not established anywhere else in this product's own data, and a compressor bought on a delivered-air number that turns out to be wrong is an expensive mistake. If your decision turns on flow at a stated pressure, ask us and we will confirm it in writing against the current Quincy sheet before you order.
Perfect For
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Independent shops on single-phase service — the whole point of this model. No converter, no separate starter.
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Serious home and hobby garages with a panel that can carry a dedicated 230 Volt circuit for a 5 HP motor.
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Floor-limited buildings — the vertical tank gives back roughly half the floor a horizontal 80-gallon receiver takes.
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Continuous work — sanding, blasting, running more than one air tool at a time, where a duty-cycle-limited machine would be the bottleneck.
What's in the Box
The compressor as a complete factory assembly: two-stage cast-iron belt-drive pump with aluminium head and stainless reed valves, heavy-duty capacitor-start industrial motor with built-in thermal overload, factory-fitted magnetic starter, high-efficiency finned tube intercooler, large balanced cast-iron flywheel, enclosed belt guard, oil sight glass, vertical 80-gallon tank with safety relief, drain and 3/4" outlet.
Specifications
Motor and supply
| Rated power |
5 HP |
| Supply |
230 Volt AC, 1-Phase |
| Magnetic starter |
Fitted at the factory |
| Breaker |
Consult a certified electrician — sizing depends on run length and local code |
| Power type |
Electric |
Pump
| Type |
Two-stage, belt drive, splash lubricated |
| Material |
Cast iron with aluminium head; stainless steel reed valves |
| Duty cycle |
100% |
| Maximum pressure |
175 PSI |
| Delivered air |
Recorded in our data as 17.2 cubic feet per minute at 175 PSI. Ask us to confirm it in writing before you design an air system around it. |
| Oil sight glass |
Fitted |
| Aftercooler / air dryer |
Not fitted |
Tank, size and weight
| Receiver |
80-gallon, vertical, with pressure relief |
| Outlet |
3/4" |
| Drain |
Manual — no electronic drain valve |
| Overall |
37" long × 24" wide × 74" high |
| Weight |
680 lbs |
Certification, Stated Plainly
The product data lists an ASME pressure-vessel receiver with relief valves, along with UL and CSA recognition for electrical components.
These are separate certifications and do not indicate a third-party safety listing for the complete packaged machine as installed. If your insurer, fleet standard or local authority requires a specific complete-equipment listing, confirm the requirement before ordering.
Shipping & Receiving
Ships by palletized freight within the lower 48 states, with the freight rate calculated at checkout for your delivery address.
Plan the unloading before ordering. A loading dock, forklift or suitable pallet jack on level ground is recommended. Freight-terminal pickup is another option if you have the equipment to unload it.
Residential deliveries may incur a residential fee.
Inspect the compressor before signing. Document any visible damage on the bill of lading with the driver present and take photos for your records.
Warranty
Quincy provides a 1-year factory warranty, with eligibility for the 3-year “No Bull” warranty subject to the manufacturer’s terms, including applicable maintenance-kit and registration requirements. Review the current warranty documentation before relying on the extended coverage.
If the pump develops a problem, contact us before disassembling it. Keep the compressor assembled so the manufacturer can properly evaluate the cause of the failure before any repairs are performed.
Warranty Details
