Nissan VH motors, released between 1989 and 2001, are available in 4.1L and 4.5L (4,130 cc and 4,494 cc) variations. They comprise a 90-degree V8 with aluminium cylinder block, featuring a closed top deck plus a deep skirt.
Aluminium cylinder heads keep a dual overhead camshaft with four valves construction and pentroof combustion chambers. The production forms and productions head castings were applied for many kinds of racing, comprising the IRL.
Nissan VH45DE specs
|Also called||Nissan VH45|
|Cylinder block alloy||Aluminum|
4 valves per cylinder
|Piston stroke, mm (inch)||82.7 (3.26)|
|Cylinder bore, mm (inch)||93 (3.66)|
|Displacement||4494 cc (274.2 cu in)|
|Power output||207 kW (280 HP) at 6,000 rpm|
|Torque output||396 Nm (292 lb·ft) at 4,000 rpm|
|HP per liter||62.3|
|Weight, kg (lbs)||–|
|Fuel consumption, L/100 km (mpg)
|for Infiniti Q45
|Oil consumption , L/1000 km
(qt. per miles)
|up to 1.0
(1 qt. per 600 miles)
|Recommended engine oil||5W-30
|Engine oil capacity, L (qt.)||5.6 (5.9)|
|Oil change interval, km (miles)||5,000-10,000
|Normal engine operating temperature, °C (F)||–|
|Engine lifespan, km (miles)
-No life span loss
- Infiniti Q45
At the moment of its introduction, VH45DE was rather an innovative motor as a scanty number of V8 motors with double overhead camshafts could boast of great reliability. Actually, the main VH45’s rival in the market was Toyota 1UZ while the other motors with similar characteristics turned out to be non-durable.
The aluminum block and heads of this 90-degree V8 motor contribute to keeping the weight down, which is crucial for maintaining a lightweight vehicle. Each head is provided with 2 camshafts and four valves per cylinder.
The motors, released between 1990 and 1996, kept the brand’s variable valve timing (VTC) and “Coil-on-Plug” ignition system with separate coils for every spark plug. VTC served for increasing the motor output and fuel economy.
Keeping an aluminum block with 5-bearing crankshaft supported system, VH45DE features low-friction pistons covered with molybdenum, connecting rods and crankshaft of forged steel, 6-bolt main bearing caps with studs. The diameter of the crankshaft journal is 63.960 mm (2.5181 inches) while the one of the crankpin equals to 51.970 mm (2.0461 inches).
While cylinder bore is 93.0 mm (3.66 inches) and piston stroke is 82.7 mm (3.26 inches), the connecting rods are 147.0 mm (5.79 inches). The compression index equals to 10.2. VH45DE is provided with 2 compression and 1 oil control rings.
Light aluminum allow, the cylinder head is made of, provides it with great cooling. The motors, produced in 1990-1995, feature Variable Valve Timing Control system on inlet shafts. VH45DE is supplied with electronic throttle body, exhaust valves filled with sodium, cross-flow cooling system plus hydraulic lash regulators. Single-row silent timing chain controls camshafts.
Diameter of the inlet valve is 38.0 mm (1.47 inches) while the exhaust valve is 33.0 mm (1.2992 inches). Both intake and exhaust duration equals to 248 degrees.
VH45DE engine problems and reliability
Though VH45DE is noted for its reliability, some troubles still may occur. For instance, the plastic timing chain frequently breaks after 100,000-120,000 miles (150,000-200,000 kilometers) are run. Clearly, a vehicle may drive much more, but it’s important to examine the timing chain regularly. Or, maybe, it’s reasonable to replace it with a metallic one. Also, some problems with MAF-sensor and knock sensor are possible.
Some other faults may happen because of the motor aging. Note that the engine will serve longer if to use only good quality fuel and oil as well as maintain it properly.
If you are fan of high-performance engines and want your VH45DE to reach such a great power as some other V8 motors of the Japanese manufacturers (like Toyota 1UZ, which stock block is able to hold up to 1,000 hp, or Nissan RB lineup, which is highly estimated by many tuning-addicted drivers), we have some good news for you.
Like the brand’s RB series, the VH motors may reach up to 500-600 hp on a fully original bottom end. So, you are free to acquire a far-famed supercharger. Actually, installment of the supercharger is the most widespread option of adding power to the motor to raise its horsepower to 280 or even 350.
Additionally, the output can be increased with the help of updating OEM camshafts and adapting ECU. Plus, you can acquire performance intake manifold, featuring large throttle body, and high compression pistons. As a result, you will have a chance to achieve more than 400 hp.