Volvo Penta D4-320 Inboard Diesel Engine – 320 HP of Marine Efficiency & Power
The Volvo Penta D4 320 is a 3.7L, 4-cylinder turbocharged diesel engine designed for exceptional performance, superior fuel efficiency, and long-lasting reliability. Featuring common-rail fuel injection, DOHC architecture, and low-maintenance operation, the D4-320 is engineered for boaters who demand power without compromising efficiency or space.
Whether you’re navigating coastal waters or embarking on long offshore voyages, the D4-320 delivers smooth acceleration, clean emissions, and reliable cruising performance with a minimal footprint.
Key Features:
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320 HP at 3,600 RPM – Delivers high torque and rapid response across the RPM range.
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3.7-Liter 4-Cylinder Engine – Turbocharged diesel with common-rail injection for optimal combustion and economy.
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DOHC Design – Enhances airflow and efficiency for better performance.
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Multiple Gear Options – Compatible with ZF68IV, HS68A, and HS85A gears, or stern drive configurations.
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Electrical Compatibility – Available in both 12V and 24V systems to suit your vessel’s setup.
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Low Maintenance Cost – Engineered for fewer service intervals and reduced operating expenses.
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Compact Design – Fits easily in tight inboard compartments while maintaining excellent service access.
Technical Specifications:
| Specification | Details |
|---|---|
| Power Output | 320 HP @ 3600 RPM |
| Cylinders | 4 (Inline) |
| Displacement | 3.70 Liters |
| Fuel System | Common-Rail Direct Injection |
| Aspiration | Turbocharged |
| Engine Management | Electronic |
| Voltage | 12V / 24V DC |
| Gear Options | ZF68IV / HS68A / HS85A / Stern Drive |
| Length | 1157 mm |
| Width | 49.00 in |
| Height | 33.00 in |
| Dry Weight | Contact for Details |
Ideal Applications:
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High-performance pleasure craft
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Sport boats and fishing vessels
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Light-duty commercial boats
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Stern drive or inboard diesel setups
Why Choose the Volvo Penta D4 320?
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Legendary Volvo Penta durability
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Superior fuel economy and low emissions
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Broad parts availability and support
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Factory-backed warranties and proven marine reliability
Need Help with Fitment or Configuration?
Contact the X Factors Motorsports team for expert guidance on selecting the right transmission, stern drive setup, or electronic accessories. We can assist with installation support and remote shipping options worldwide.
Marine Diesel Engine Comparison: Volvo Penta D4-320 vs Yanmar 8LV320 vs Cummins QSB6.7
| Feature | Volvo Penta D4-320 | Yanmar 8LV320 | Cummins QSB6.7 |
|---|---|---|---|
| Engine Type | 4-cylinder, in-line diesel | 8-cylinder, V8 diesel | 6-cylinder, in-line diesel |
| Displacement | 3.7L | 4.46L | 6.7L |
| Horsepower | 320 HP @ 3600 RPM | 320 HP @ 3800 RPM | Up to 480 HP depending on configuration |
| Torque (approx.) | 700 Nm (516 lb-ft) | 717 Nm (528 lb-ft) @ 2500 RPM | ~1135 Nm (837 lb-ft) @ 2000 RPM |
| Fuel Injection | Common-rail | Common-rail | High-pressure common-rail |
| Aspiration | Turbocharged | Turbocharged + Intercooled | Turbocharged + Aftercooled |
| Cooling System | Freshwater-cooled with heat exchanger | Freshwater-cooled with expansion tank | Water-cooled, with options for keel cooling |
| Electrical System | 12V or 24V | 12V standard (24V optional) | 12V or 24V |
| Dry Weight | ~840 kg (1852 lbs) with sterndrive | ~435 kg (959 lbs) | ~634 kg (1398 lbs) |
| Certifications | EPA Tier 3, IMO II, EU Stage IIIA | EPA Tier 3, EU RCD 2 | EPA Tier 3, IMO II |
| Control System | EVC (Electronic Vessel Control) | Electronic throttle and shift | SmartCraft or custom marine ECM |
| Application | Recreational and light commercial | Luxury yachts, powerboats, light-duty workboats | Commercial and recreational marine vessels |
| Maintenance | Moderate – known for low maintenance intervals | Low – designed for extended service intervals | Moderate to high – built for heavy use |
| Optional Drives | Sterndrive or shaft drive (ZF/HS compatible) | Shaft or stern drive (ZF/SD25 compatible) | Shaft drive (ZF options) |
| Notable Strengths | Compact design, integrated controls, high tech | Lightweight, quiet, reliable at high RPM | Heavy-duty durability, high torque output |
