What engine does the PR-1000 use?

PSI 8.1L turbocharged and charge air cooled inline-6 — a displacement unique to the PR prime series (not used in the SP standby series). This engine is calibrated for continuous-duty at 199 bhp (100 kW prime). The inline-6 architecture provides smooth power delivery for sustained operation.

Why is this NG-only when the PR-800 supports both NG and LPG?

The PR-1000's turbocharged 8.1L I6 is calibrated specifically for natural gas at 100 kW continuous. The turbocharger and fuel system are optimized for NG properties under boost. The naturally aspirated PR-800 has less fuel-specific calibration dependency, allowing dual-fuel operation.

The PR-1000 and PR-1300 share the same 8.1L engine — how do they differ?

Both use the PSI 8.1L I6 TCAC but at different calibrations: PR-1000 at 199 bhp (100 kW) and PR-1300 at 200 bhp (130 kW). The PR-1300 runs at higher BMEP for 30% more output from the same displacement.

Gillette · PR Series (Prime Gas)

Gillette PR-1000

100 kW standby · Natural Gas · Liquid-cooled

100 kW prime-rated natural gas generator. PSI 8.1L I6 turbocharged, Stamford UCI274E alternator, DSE 7420 MKII. Continuous duty. Made in USA.

Standby power: 100 kW / 100 kW prime
Voltage options: 120/240V, 120/208V, 277/480V, 346/600V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: PSI 8.1L I6 TCAC · 8.1L
EPA / Emissions: EPA Stationary Spark Ignition
Alternator: Stamford UCI274E-311

prime-powerremote-siteminingagriculturalCommercialoff-grid

Overview#

The Gillette PR-1000 is a 100-kilowatt prime-rated natural gas generator on PSI's 8.1L turbocharged inline-6 — a displacement unique to the PR prime series. At 100 kW continuous duty, this serves remote and off-grid facilities requiring reliable prime power where utility grid is unavailable or unreliable.

The PSI 8.1L I6 TCAC — a prime-specific platform#

Unlike the SP standby series which uses the 8.8L V8, the PR-1000 and PR-1300 use PSI's 8.1L inline-6 with turbocharging and charge air cooling. The inline-6 architecture is preferred for continuous duty due to inherent mechanical balance and smooth operation at sustained loads.

Our service experience#

The PSI 8.1L prime gas engine requires disciplined maintenance at shortened intervals: 250-hour oil changes, 1000-hour spark plug replacement, and 500-hour air filter service. Under continuous operation, these intervals come quickly — monthly oil changes at 24/7 duty. We recommend structured maintenance contracts for prime-power installations.

Engineering specifications

Physical

Length: 132 in
Width: 52 in
Height: 65 in
Wet weight: 5,175 lb

Acoustic

Sound @ 7m, full load: 75 dBA
Enclosure: Sound-attenuated

Fuel system & runtime

BTU/hr @ full load: 1,330,000

Photos

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Gillette PR-1000

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

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Generator size

Fuel

Load

Fuel demand at 75% load

1,050,000 BTU/hr≈ 1050.0 cf/min @ 1,000 BTU/cf

On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.

Service intervals

Manufacturer-recommended intervals for the Gillette PR-1000 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 250 hours or 6 months
Coolant change: Every 4000 hours
Air filter: Every 500 hours
Spark plugs: Every 1000 hours
Major overhaul: ≈ 15,000 hours
Load bank test: Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

Component	Symptom	Typical hours	Severity
Turbocharger	Power loss from continuous duty wear	10,000+	moderate
Spark plugs / ignition	Misfire, rough running	1,000+	moderate
Oil degradation	Accelerated valve train wear	250+	minor

Frequently Asked Questions

What engine does the PR-1000 use?: PSI 8.1L turbocharged and charge air cooled inline-6 — a displacement unique to the PR prime series (not used in the SP standby series). This engine is calibrated for continuous-duty at 199 bhp (100 kW prime). The inline-6 architecture provides smooth power delivery for sustained operation.
Why is this NG-only when the PR-800 supports both NG and LPG?: The PR-1000's turbocharged 8.1L I6 is calibrated specifically for natural gas at 100 kW continuous. The turbocharger and fuel system are optimized for NG properties under boost. The naturally aspirated PR-800 has less fuel-specific calibration dependency, allowing dual-fuel operation.
The PR-1000 and PR-1300 share the same 8.1L engine — how do they differ?: Both use the PSI 8.1L I6 TCAC but at different calibrations: PR-1000 at 199 bhp (100 kW) and PR-1300 at 200 bhp (130 kW). The PR-1300 runs at higher BMEP for 30% more output from the same displacement.

Compatible equipment

Controllers

DSE 7420 MkIIControllers

Transfer switches

More in the PR Series (Prime Gas)

80–540 kW natural gas prime power on PSI engines — continuous duty for remote sites, mining, and off-grid operations.

View all 7models in this series →

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