Nissan VK engine
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| Nissan VK | |
|---|---|
| Manufacturer | Nissan Motor Co., Ltd. |
| Also called: | Nissan ZH |
| Production: | 2002– |
| Predecessor: | Nissan VH |
The VK engine (formerly known as the ZH) is a V8 piston engine from Nissan. It is an aluminum DOHC 4-valve design with variable valve timing. The timing of the intake valves is continuously fine-tuned to ensure air enters the cylinder at exactly the right moment for optimum combustion. It also features a variable intake system and an optional direct injection fuel system.
The VK is based on Nissan's VQ V6 rather than the VH V8 used in previous Q45/Cima models. Changes include titanium valves and aluminium lifters, which being lighter than equivalent steel items allow the engine to respond more quickly and more quietly. The intake manifold directs air through different paths at different engine speeds to boost low-end torque or unleash high-end horsepower. The 4.5 L engine uses a 93 mm (3.7 in) bore and 82.7 mm (3.26 in) stroke and a 90° bank angle.
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[edit] VK45DE
The 4.5 L (4494 cc) VK45DE was introduced in 2002 and is built in Yokohama, Japan. Bore is 93 mm (3.7 in) and stroke is 82.7 mm (3.26 in). Output is 340 hp (254 kW) at 6400 rpm with 333 ft·lbf (451 Nm) of torque at 4000 rpm. Redline is at 6600 rpm. It has an aluminum engine block and aluminum DOHC cylinder heads. It uses SFI fuel injection, has 4 valves per cylinder with VVT and features forged steel connecting rods, a one-piece cast camshaft, and an unusual nylon intake manifold, variable-flow induction system optimizes airflow for low- and high-speed operation and low-friction molybdenum-coated pistons and microfinished crankshaft.
This engine is used in the following vehicles:
- 2002–2006 Infiniti Q45, 340 hp (250 kW)
- 2003–present Infiniti FX45, 315 hp (235 kW) and 446 N·m (329 ft·lbf)
- 2003–2004 Infiniti M45, 335 hp (250 kW) and 461 N·m (340 ft·lbf)
- 2004–present Nissan Fuga , 333 hp (248 kW) and 461 N·m (340 ft·lbf)
[edit] VK45DD
The VK45DD is the same as the VK45DE but adds an direct injection fuel system. This was Nissans first V8 with direct injection. It produces (officially) 280 PS (276 hp/206 kW) @6000 rpm and 451 N·m (333 ft·lbf) @3600 rpm. But it has unofficially over 300 PS (296 hp/221 kW). It has a compression ratio of 11.0.
It was used in the following:
- 2001–present Nissan Cima
[edit] VK50VE
The VK50VE is a 5.0 L V8 engine with 390 hp and 500 Nm. It has Nissans VVEL technology. Bore x stroke (mm) 95.5 x 87.7
Applications:
- 2009- Infiniti FX
http://nissan.iconicweb.com/assets/specs/2009_FX_Specs_NNA_Final.pdf
[edit] VK56DE
The VK56DE is a 5.6 L (5552 cc) version built in Decherd, TN. Bore is 98 mm (3.9 in) and stroke is 92 mm (3.6 in). Output is 305 hp (227 kW) at 4900 rpm with 375 to 390 ft·lbf (509-522 Nm) of torque at 3600 rpm. It has aluminum-alloy block and heads and low-friction molybdenum-coated pistons. The valvetrain is a dual overhead cam (DOHC). It has 4 valves per cylinder with microfinished camshafts and cast-iron cylinder liners for increased durability.
Applications:
- 2007 (2004?)–present Nissan Armada, 317 hp (236 kW)
- 2004–present Nissan Titan, 317 hp (236 kW)
- 2007 (2004?)–present Infiniti QX56, 320 hp (240 kW)
- 2008–present Nissan Pathfinder, 316 hp (236 kW)
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- Note: the Titan numbers are for 87 octane fuel. The 320 hp (240 kW) number for the Infiniti was using premium (93 octane) fuel. Using 93 octane fuel equalized the hp number.
[edit] See also
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