The Infiniti QX56 (JA60) is a first generation of full-size sport utility vehicle (SUV) manufactured by the Infiniti division of Nissan Motor Company since 2004 to 2010.
The QX56 was based on the Nissan F-Alpha platform and was equipped with 5.6 L V8 engine VK56DE and an electronically controlled 5-speed automatic transmission with a driver-adaptive learning algorithm. The QX56 was available in rear-wheel or four-wheel drive versions.
The engine has an aluminum cylinder block with low-friction molybdenum-coated pistons and an aluminum head with DOHC (Dual overhead camshaft) design and four valves per cylinder. Each cylinder in the engine was lined with cast iron. The VK56DE has an electronic throttle, ignition system with individual coils on each spark plug and engine-speed-sensing variable-assist power rack-and-pinion steering. The first generation of the engine was not equipped with any valve timing control system, the version after 2007 has CVTC (Continuous Variable Valve Timing Control) system on intake shafts.
The VK56DE engine cylinder bore and piston stroke is 98.0 mm (3.86 in) and 92.0 mm (3.62 in), respectively. Compression ratio rating is 9.8:1. The QX56 produced from 315 HP (235 kW) to 320 HP (240 kW) and 390 lb⋅ft (530 N⋅m) to 393 lb⋅ft (533 N⋅m).
Engine Specifications
| Infiniti QX56 Engine Specifications | ||
| Engine code | VK56DE | |
| Layout | Four stroke, V8 | |
| Fuel type | Gasoline (petrol) | |
| Displacement | 5.6 L, 5,552 cc (338.80 cu in) | |
| Cylinder block alloy | Aluminium | |
| Cylinder bore | 98.0 mm (3.86 in) | |
| Piston stroke | 92.0 mm (3.62 in) | |
| Compression ratio | 9.8:1 | |
| Block head alloy | Aluminium | |
| Valve Arrangement: | DOHC, chain drive | |
| Valves: | 32 (4 valves per cylinder) | |
| Intake valve timing: | W/o CVTC: 230° With CVTC: 232° | |
| Exhaust valve timing: | W/o CVTC: 232° With CVTC: 244° | |
| Intake valve head diameter: | 37.0 mm (1.457 in) | |
| Exhaust valve head diameter: | 31.2 mm (1.228 in) | |
| Fuel system | Multi Point Fuel Injection | |
| Power output | From 2004 to 2006: 315 HP (235 kW) at 4,900 rpm From 2007 to 2010: 320 HP (240 kW) at 5,200 rpm | |
| Torque output | From 2004 to 2006: 390 lb⋅ft (530 N⋅m) at 3,600 rpm From 2007 to 2010: 393 lb⋅ft (533 N⋅m) at 3,400 rpm | |
| Firing order | 1-2-3-4-5-6 | |
| Engine weight | 225 kg (496 lbs) | |
Top speed and fuel consumption
| Top speed and Fuel consumption | |
| Top speed | 180 km/h (112 mph) |
| Fuel consumption (city) | ~ 18.1 l/100 km (13 mpg U.S.) |
| Fuel consumption (highway) | ~ 12.5 l/100 km (19 mpg U.S.) |
| Fuel consumption (combined 50/50) | ~ 15.6 l/100 km (15 mpg U.S.) |
Maintenance data
| Valve clearance (HOT)* | |
| Intake valve | 0.304-0.416 mm (0.012-0.016 in) |
| Exhaust valve | 0.308-0.432 mm (0.012-0.017 in) |
| Compression pressure | |
| Standard | 15.5 kg/m2 (220 psi) / 200 rpm |
| Minimun | 13.5 kg/m2 (192 psi) / 200 rpm |
| Compression differential limit between cylinders | 1.0 kg/m2 (15 psi) / 200 rpm |
| Oil system | |
| Recommended engine oil | 5W-30, 10W-30, 10-W40 |
| Oil type API | API Certification Mark |
| Engine oil capacity (Refill capacity) | With filter: 6.5 l (6.8 US. qt., 5.75 Imp. qt.) Without filter: 6.2 l (6.5 Us. qt., 5.5 Imp. qt.) |
| Oil change interval, km (miles) | Every 6,000 (7,500) |
| Oil Pressure, kPa (kg/cm 2, psi) | Idle speed: More than 98 (1.0, 14) 2,000 rpm: More than 294 (3.0, 43) |
| Cooling system | |
| Recommended coolant | Genuine NISSAN Long Life Anti-freeze coolant or equivalent |
| Coolant capacity | 14.4 L (15.2 US. qt., 12.6 Imp. qt.) |
| Ignition system | |
| Spark plug | NGK: DILFR5A-11 |
| Spark plug gap | 1.1 mm (0.043 in) |
*Valve clearance adjustment data is here.
Vehicle dimensions and weight
| Infiniti QX56 (2004-2010) dimensions and weight | ||
| 2WD | 4WD | |
| Overall length | 5,255 mm (206.9 in) | |
| Overall width | 2004-2007: 2,001 mm (78.8 in) 2008-2010:: 2,021 mm (79.6 in) | |
| Overall height (with roof rack) | 2004-2007: 1,976.8 mm (77.8 in) 2008-2010: 1,948 mm (76.7 in) | 2004-2006: 1,997.7 mm (78.7 in) 2008-2010: 1,968 mm (77.5 in) |
| Front tread width | 2004-2007: 1,725 mm (67.9 in) 2008-2010: 1,729 mm (68.1 in) | |
| Rear tread width | 2004-2007: 1,725 mm (67.9 in) 2008-2010: 1,729 mm (68.1 in) | |
| Wheelbase | 3,130 mm (123.2 in) | |
| Curb weight | 2,539 kg (5,597 lb) | |
| Payload | 638 kg (1,407 lbs) | |
| Minimum Running Ground Clearance (at front suspension) | ||
| 2004-2007 With standard undercover | 254.8 mm (10.03 in) | 273.7 mm (10.77 in) |
| 2004-2007 With oil pan skid plate | 250.5 mm (9.86 in) | 269.5 mm (10.61 in) |
| 2008-2010 | 211.2 mm (8.3 in) | 232.0 mm (9.1 in) |
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