CAT G3304 Engine

Caterpillar G3304 Engine – Specifications

General

• Manufacturer: Caterpillar

• Engine Model: G3304

• Fuel Type: Natural Gas (also compatible with field gas / LP with setup)

• Cycle: 4-stroke

• Aspiration: Naturally Aspirated (some variants turbocharged, but G3304 is typically NA)

• Application: Generator sets, compression, industrial power

Engine Configuration

• Configuration: Inline 4-cylinder

• Displacement: 7.0 L (428 cu in)

• Bore x Stroke: 4.75 in × 6.00 in

• Compression Ratio: ~9.5:1 (varies by setup)

Power Ratings (Typical)

• Continuous Power: 85–100 HP

• Rated Speed: 1800 RPM (60 Hz genset use)

• Torque: ~300–330 lb-ft

(Exact rating depends on gas quality, altitude, and ignition setup.)

Electrical / Ignition

• Ignition System: Magneto or electronic ignition (application dependent)

• Starting System: 24 VDC (most industrial packages)

Cooling & Lubrication

• Cooling: Jacket-water cooled

• Oil Capacity: ~4–5 gallons

• Oil Pressure (hot): 35–55 psi

• Recommended Oil: SAE 30 or SAE 40 (stationary gas engine oil)