Overview & Design Features
The Infiniti VK50VE is a high-performance 5.0-liter (5026 cc) naturally aspirated V8 gasoline engine, part of Nissan’s esteemed VK engine family. Manufactured by Nissan, this powertrain represents a pinnacle of naturally aspirated V8 development for the luxury segment. Introduced in 2009, it was engineered to deliver a blend of robust power, smooth operation, and sophisticated efficiency, distinguishing itself as a significant offering in Infiniti’s performance portfolio during its production era.
Constructed with a lightweight aluminum alloy cylinder block and heads, the VK50VE benefits from reduced mass and enhanced heat dissipation. A key technological highlight is the incorporation of Infiniti’s advanced Variable Valve Event and Lift (VVEL) system on the intake valves, paired with conventional Variable Valve Timing (VVT) on the exhaust. This combination optimizes valve lift and duration continuously, improving throttle response, fuel economy, and emissions. Fuel delivery is managed by a sophisticated Direct Injection Gasoline (DIG) system, further contributing to combustion efficiency and power output.
The VK50VE engine was primarily deployed in Infiniti’s flagship performance and luxury vehicles. Its initial application was in the 2009-2013 Infiniti FX50 S51 crossover SUV. Subsequently, it powered the 2011-2013 Infiniti M56 (Y51 chassis) luxury sedan. Following Infiniti’s nomenclature change, this engine continued service in the 2014-2019 Infiniti QX70 (formerly FX50) and the 2014-2019 Infiniti Q70 (formerly M56), consistently representing the top-tier engine option for these models.
Technical Specifications
| Displacement (cc) | 5026 |
| Max Power (hp (kW) @ RPM) | 420 hp (313 kW) @ 6800 RPM |
| Max Torque (Nm (kg*m) @ RPM) | 500 Nm (51 kg*m) @ 4400 RPM |
| Fuel Type | Premium Unleaded (91+ RON) |
| Fuel Consumption (l/100 km) | 13.1 (Combined, for FX50/QX70) |
| Engine Type | V8, Naturally Aspirated |
| Compression Ratio | 10.9:1 |
| Cylinder Bore (mm) | 95.5 |
| Piston Stroke (mm) | 87.7 |
| Valvetrain | DOHC, 4 valves per cylinder |
| Valves per Cylinder | 4 |
| Additional Info | Variable Valve Event and Lift (VVEL), Direct Injection Gasoline (DIG) |
Common Problems & Reliability
The Infiniti VK50VE is generally regarded as a robust and reliable engine, but like any complex high-performance unit, it has specific areas that warrant attention.
- VVEL System Components: While innovative, the Variable Valve Event and Lift (VVEL) actuators and motors can occasionally experience wear or electronic faults at higher mileages. Symptoms may include rough idle, reduced power, or diagnostic trouble codes related to valve timing. Diagnosis and repair can be intricate and costly, typically requiring specialized tools and expertise.
- Direct Injection Carbon Buildup: As a direct injection engine, the VK50VE is susceptible to carbon accumulation on the intake valves over time, as fuel does not wash over the valve stems. This can lead to decreased airflow, reduced performance, and potential misfires. Regular use of top-tier fuel and periodic intake system cleaning are advisable preventative measures.
- Accessory Drive Belt System: Components such as the serpentine belt tensioner and idler pulleys are known to develop noise or wear out over extended periods. While not catastrophic, a failed component can lead to a loss of essential engine accessories like power steering or the alternator. Regular inspection and timely replacement of these items prevent larger issues.
Under diligent maintenance, the VK50VE engine can reliably achieve service lives exceeding 200,000 miles (approximately 320,000 km) before requiring major internal overhauls.
Maintenance Tips & Service Schedule
Adhering to a strict maintenance regimen is paramount for preserving the VK50VE’s longevity and performance.
- Engine Oil: Synthetic 5W-30 engine oil is recommended. Oil and filter changes should be performed every 5,000 to 7,500 miles (8,000-12,000 km) or every six months, whichever comes first, especially when operating under severe conditions.
- Spark Plugs: Iridium-tipped spark plugs should be replaced every 60,000 to 100,000 miles (100,000-160,000 km). Prompt replacement ensures optimal ignition and prevents misfires that can stress ignition coils.
- Timing Chain: The VK50VE utilizes a robust timing chain system designed for the life of the engine. However, periodic inspection for excessive slack or noise is prudent at very high mileages, typically above 150,000 miles (240,000 km).
- Coolant Flush: The engine cooling system should be flushed and refilled with the manufacturer-specified long-life coolant every 60,000 miles (100,000 km) or every five years to prevent corrosion and maintain cooling efficiency.
- Air Filters: Engine air filters should be inspected at every oil change and replaced every 15,000 to 30,000 miles (24,000-48,000 km), depending on driving conditions, to ensure proper air intake and filtration.
- Fuel System Cleaning: Given the direct injection system, periodic use of a high-quality fuel system cleaner is advisable to help mitigate carbon buildup on intake valves and fuel injectors.
Conclusion
The Infiniti VK50VE stands as a testament to Nissan’s engineering prowess in crafting naturally aspirated V8 engines. With its potent output, advanced VVEL technology, and generally robust construction, it offers a compelling blend of performance and luxury. For a used vehicle buyer, an Infiniti model equipped with the VK50VE can be a highly rewarding choice, provided its service history is documented, and it has received consistent, quality maintenance. Potential owners should prioritize pre-purchase inspections focusing on the VVEL system and general engine health to ensure long-term satisfaction.