Parts for Detroit Diesel 6V71 Turbo

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Detroit Diesel 6V71 Turbo Engine Specifications & Applications

Introduction to the Detroit Diesel 6V71 Turbocharged Engine

The Detroit Diesel 6V71 Turbo engine is the turbocharged version of the legendary V6 configuration in the 71 Series. Combining the compact footprint of a 6-cylinder V-type engine with forced induction, the 6V71 Turbo delivers significantly more horsepower and torque than its naturally aspirated counterpart, making it the go-to choice for marine vessels, heavy-duty industrial equipment, and high-output generator sets.

Renowned for its rugged design, simplicity, and modular components, the 6V71 Turbo uses a mechanically governed fuel system and a non-electronic turbocharger to increase engine breathing, improve combustion efficiency, and boost output—without sacrificing reliability. Its forced induction setup makes it ideal for operators needing extra power from the same 426 cubic inch displacement.

At Diesel Pro Power, we carry a full line of aftermarket parts for the Detroit 6V71 Turbo engine—built to OEM-match or better. Whether you’re looking to rebuild, replace a turbo, or upgrade from naturally aspirated, our inventory includes overhaul kits, turbochargers, injectors, gasket sets, and more—all backed by expert support and fast global shipping.

Engine Configuration and Core Specifications

Engine Series: Detroit Diesel 71 Series
Model: 6V71 Turbocharged
Configuration: V6 (60° bank angle)
Cycle: 2-Stroke Diesel
Aspiration: Turbocharged, non-intercooled (factory configuration)
Valvetrain: 4 valves per cylinder standard on turbo models (2 intake, 2 exhaust)
Fuel Injection System: Mechanical unit injectors (pressure-timed)
Firing Order: 1-4-5-2-3-6
Governor Type: Mechanical (variable or limiting speed)
Compression Ratio: ~16.5:1

Bore, Stroke, and Displacement

Bore: 4.25 inches (108 mm)
Stroke: 5.00 inches (127 mm)
Total Displacement: 426 cubic inches (6.99 liters)

Despite the unchanged displacement from the non-turbo variant, the addition of a turbo allows significantly more air and fuel to be burned per cycle, increasing horsepower by up to 35%.

Horsepower Output and Injector Sizing

Injector sizing, turbo specs, and governor settings determine power output:

Injector Size	Approx. Horsepower @ RPM
N65	~250 HP @ 2,100 RPM
N70	~265 HP @ 2,100 RPM
N75	~280 HP @ 2,100 RPM
N80	~300+ HP @ 2,100 RPM

Torque Output: 600–700 lb-ft depending on configuration
Marine RPM Range: Typically 2,100 RPM
Industrial RPM Range: Often governed at 1,800 RPM

Turbocharger Specifications

Turbo Type: Fixed-geometry, exhaust-driven
Boost Pressure: Typically 8–15 PSI under full load
Mounting: Top-mounted exhaust manifold
Intercooling: Not standard; optional in retrofitted systems
Wastegate: Not common in original design
Exhaust Manifold Material: Cast iron, high-heat rated
Oil Feed: Turbocharger is pressure-lubricated and cooled by engine oil

Diesel Pro Power offers replacement turbochargers, gaskets, studs, and oil lines—all tailored to 6V71 Turbo specs.

Oil and Cooling System Capacities

Oil Capacity (with filters): ~9 gallons (34.1 liters)
Cooling Capacity: ~6.5 gallons (24.6 liters)
Oil Pressure (Operating): 40 – 60 PSI
Normal Operating Temp: 170°F – 195°F
Maximum Coolant Temp: 200°F

Because the turbo increases heat load, proper cooling system function is even more important. Marine engines should use heavy-duty raw water or heat exchanger systems for thermal stability.

Physical Dimensions and Weight

Length: ~49 inches (124 cm)
Width: ~41 inches (104 cm)
Height: ~48 inches (122 cm)
Dry Weight: ~2,250 – 2,300 lbs (1,020–1,043 kg), depending on turbo configuration

Despite the turbo hardware, the engine retains a relatively compact profile—making it popular in vessels and equipment where space is at a premium but power demands are high.

Advantages of the Detroit 6V71 Turbocharged Engine

Significant Power Increase

Compared to the non-turbo version, the turbocharged 6V71 offers 40–80 more horsepower and increased torque without changing the engine block or footprint.

Improved Combustion Efficiency

With forced induction, the engine achieves a more complete air-fuel burn—improving power-per-gallon and reducing soot output.

Consistent Power in Extreme Conditions

Turbocharging improves performance at altitude, in hot climates, or under constant heavy load, making it ideal for global operations.

Field-Serviceable Simplicity

Despite its boosted performance, the engine remains fully mechanical, with no sensors or ECUs required for operation, diagnostics, or repair.

Marine Applications of the Detroit Diesel 6V71 Turbo

This engine is especially well-suited for commercial and performance marine operations requiring compact power and long duty cycles.

Commercial Marine Use

Tugboats and Push Boats: Used in smaller tugs and pusher vessels requiring mid-range torque for maneuvering and towing.
Fishing Vessels: Common in crabbers, shrimpers, and trawlers that benefit from added torque and cruise speed.
Utility Vessels: Workboats and support boats operating cranes, hydraulic pumps, and winches.
Transport and Cargo Vessels: Used in coastal transport and ferries requiring mid-range power with tight engine room constraints.

Recreational and Restoration Marine Use

Trawlers and Classic Yachts: Retrofitted into older vessels needing a power upgrade without overhauling the entire engine compartment.
Liveaboard Vessels: Favorable for long-term cruising and reduced engine strain at travel RPMs.
Restored Pilot Boats and Patrol Craft: Retains original Detroit sound and durability with added performance.

Industrial and Generator Applications

The 6V71 Turbo's high torque and reliability make it a go-to solution for industrial operators needing continuous power.

Generator Sets (80–125 kW): Prime or standby power in off-grid facilities, mining operations, and oil fields.
Large Water Pumps: Found in flood control systems, irrigation infrastructure, and firefighting units.
Construction Equipment: Used in pile drivers, hydraulic cranes, and mobile material handling rigs.
Drilling Support Systems: Drives air compressors, pump skids, or rotary control units on drilling platforms.