Nissan VG30DE Specifications
| Engine Model: Nissan VG30DE |
| Engine Type: 4-cycle 6-cylinder DOHC 24-valve NVCS liquid-cooled gasoline |
| Total Displacement: 180.6 cu.in (2.96 L) |
| Rated Engine Power: 222 Hp (166 kW) at 6400 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Nissan VG30DE is a 3.0-liter, naturally aspirated
V6 gasoline engine produced from 1987 through 2000. It represents a significant
milestone in Nissan’s engine development history as the company’s first
mass-produced dual overhead camshaft (DOHC) V6, evolving from the single
overhead camshaft (SOHC) VG30E that had established the VG family as a versatile
and durable powerplant throughout the 1980s.
The VG30DE was engineered to deliver higher specific output and improved
refinement compared to its SOHC predecessor, incorporating Nissan Valve Timing
Control System (NVCS) on the intake camshafts to optimize volumetric efficiency
across the engine speed range. The engine’s architecture retains the cast iron
cylinder block of the VG family, providing structural rigidity suitable for the
increased power output, while the cylinder heads are manufactured from aluminum
alloy to manage weight.
The VG30DE found its most celebrated application in the Nissan 300ZX (Z32),
where it served as the naturally aspirated counterpart to the twin-turbocharged
VG30DETT, though its deployment extended across Nissan’s premium sedan and coupe
lineup, including the Cedric, Gloria, Cima, and the Infiniti J30 for the North
American market.
The VG30DE engine represents Nissan’s refinement of the VG architecture to meet
the demands of the luxury and performance segments in the late 1980s and 1990s.
The engine’s 60-degree V-angle, retained from the earlier VG engines, provides
inherent balance characteristics that contribute to smooth operation across the
rev range. The DOHC cylinder heads, with four valves per cylinder, significantly
improve volumetric efficiency over the two-valve SOHC design, allowing the
engine to achieve a 10.5:1 compression ratio while operating on premium fuel.
The NVCS system, actuated hydraulically, advances the intake camshaft timing by
approximately 20 to 25 degrees at low and mid-range engine speeds, broadening
the torque curve and improving throttle response without sacrificing high-rpm
power. The engine utilizes a forged steel crankshaft with full counterweights, a
feature that contributes to its durability and its ability to sustain the 7,000
rpm redline.
The timing belt-driven valvetrain requires periodic replacement, and the
interference design mandates strict adherence to service intervals to prevent
valve-to-piston contact. The VG30DE’s physical dimensions are considerable for a
3.0-liter V6, with the DOHC cylinder heads adding significant width to the
engine package, making service access challenging in the tightly configured
engine bay of the Z32 300ZX. Despite this, the engine’s combination of smooth
power delivery, mechanical robustness, and technological sophistication secured
its place as a benchmark V6 of its era.
Production Period: 1987-2000.
Engine Code: VG30DE.
Configuration: 60° V6.
Displacement: 2,960 cc (180.6 cu.in).
Bore: 87.0 mm (3.43 in).
Stroke: 83.0 mm (3.27 in).
Firing Order: 1-2-3-4-5-6.
Compression Ratio: 10.5:1.
Combustion System: Electronic multipoint fuel injection (EFI).
Aspiration: Naturally aspirated.
Valvetrain: DOHC, 24 valves (4 per cylinder), NVCS on intake camshafts.
Maximum Engine Speed: 7,000 rpm (redline).
Maximum Power: 222 hp (166 kW / 225 PS) @ 6,400 rpm.
Maximum Torque: 198 lb-ft (268 Nm) @ 4,800 rpm.
The VG30DE cylinder block is manufactured from cast
iron, utilizing a 60-degree V-angle that provides inherent primary and secondary
balance without the requirement for balance shafts. The block features a
deep-skirt design that extends below the crankshaft centerline, enhancing
structural rigidity and reducing vibration transmission. Four main bearings
support the crankshaft, with the bearing caps secured using high-tensile steel
bolts. The cylinder bores are cast directly into the block and are finished with
a precision-honed surface, with no separate cylinder liners employed.
The crankshaft is constructed from forged steel and is fully counterweighted, a
design feature that contributes to the engine’s ability to sustain high engine
speeds with minimal vibration. The block incorporates cast-in coolant passages
surrounding each cylinder bore and oil galleries drilled to supply pressurized
lubricant to the crankshaft, connecting rods, and cylinder heads. The engine
mounting points are cast into the block to accommodate the longitudinal
orientation used in all applications.
The cylinder heads are manufactured from cast aluminum
alloy, with separate heads for each cylinder bank. Each head incorporates dual
overhead camshafts, with the intake camshaft equipped with the NVCS (Nissan
Valve Timing Control System) mechanism. The NVCS system utilizes an
oil-pressure-actuated phase advancer mounted at the front of each intake
camshaft, capable of advancing cam timing by approximately 20 to 25 degrees
relative to the crankshaft position.
The system is engaged by the engine control unit based on engine speed and load,
improving low-end torque and reducing exhaust emissions during cold start. The
valvetrain utilizes 24 valves total, with each cylinder served by two intake
valves and two exhaust valves. The valves are actuated via hydraulic lash
adjusters and roller rocker arms, eliminating the requirement for manual valve
clearance adjustments.
The intake valves measure 35.0 mm (1.38 in) in diameter, while the exhaust
valves measure 30.0 mm (1.18 in). The combustion chamber is a pent-roof design
with centrally positioned spark plugs, optimizing flame propagation and
resistance to detonation at the 10.5:1 compression ratio.
The fuel system utilizes Nissan’s electronic multipoint
fuel injection (EFI), with a fuel injector positioned at each intake port. The
system operates at a nominal fuel pressure of 2.5 bar (36 psi), regulated by a
fuel pressure compensator mounted on the fuel rail that maintains constant
pressure differential across the injectors relative to intake manifold vacuum.
Fuel is delivered from an in-tank fuel pump through a filter and to the dual
fuel rails - one for each cylinder bank - constructed from stainless steel.
The injectors are sequentially fired by the engine control unit based on signals
from the crankshaft position sensor and camshaft position sensors. The engine
control unit calculates injector pulse width using inputs including mass
airflow, engine speed, throttle position, coolant temperature, and exhaust
oxygen sensor feedback. A hot-wire mass airflow sensor is located in the intake
tract, providing precise measurement of incoming air mass for accurate fuel
delivery calculations.
The lubrication system employs a wet-sump design with a
gear-type oil pump mounted within the front timing cover, driven directly by the
crankshaft. The pump incorporates a pressure relief valve to maintain consistent
oil pressure across the engine speed range. Oil is drawn from the sump through a
screened pickup tube and delivered through a full-flow spin-on oil filter
mounted on the cylinder block. The filtered oil is distributed through internal
galleries to the crankshaft main bearings, connecting rod bearings, camshaft
bearings, the NVCS actuators, and the hydraulic lash adjusters.
An oil cooler is integrated into the system on certain applications, utilizing
engine coolant to maintain oil temperature. The NVCS system relies on consistent
oil pressure and cleanliness for proper operation; oil contamination or low oil
pressure can result in reduced system function. Total system capacity, including
the filter, is 4.0 to 4.5 liters (4.2 to 4.8 qt) depending on the vehicle
application.
The cooling system is a pressurized water-cooled design
utilizing a crossflow aluminum radiator with plastic end tanks, sized to manage
the thermal load of the 3.0-liter V6. A centrifugal water pump, driven by the
timing belt, circulates coolant through the cylinder block, cylinder heads, and
radiator. The water pump is a service item replaced in conjunction with the
timing belt.
A wax-element thermostat is positioned in the coolant outlet housing, with a
nominal opening temperature of 76.5°C (170°F). The system incorporates an
expansion tank to accommodate coolant expansion and to facilitate air removal.
An electric cooling fan, controlled by the engine control unit or a dedicated
fan control module, provides airflow across the radiator during low-speed
operation and stationary idle.
The cooling system is designed to maintain consistent operating temperatures
across the two cylinder banks, with the water pump and thermostat housing
positioned centrally to ensure balanced coolant distribution. Coolant capacity
varies by vehicle application but generally ranges from 8.0 to 9.0 liters (8.5
to 9.5 qt).
| Intake and Exhaust Systems |
Intake System: The intake system consists of an air
cleaner housing with a replaceable dry-type filter element, a hot-wire mass
airflow sensor, and a dual-path intake manifold. The intake manifold is
constructed from aluminum and incorporates a plenum chamber that feeds
individual runners to each cylinder head. The runner length is tuned to optimize
torque delivery in conjunction with the NVCS system. The manifold incorporates a
resonance chamber to reduce intake noise.
Exhaust System: The exhaust system utilizes a cast iron exhaust manifold on each
cylinder bank. The manifolds are designed with equal-length runners to optimize
exhaust gas flow and reduce interference between cylinders. The system
incorporates oxygen sensors upstream of the catalytic converters for closed-loop
fuel control, with downstream sensors on later models for catalyst monitoring.
The exhaust pipes merge downstream of the converters into a single system with a
resonator and muffler.
| Ignition and Electrical System |
Ignition System: The ignition system utilizes a
distributor-based design on early variants, with the distributor driven by the
right intake camshaft. Later variants and those equipped with the Infiniti J30
utilize a distributorless ignition system with individual ignition coils. The
spark plugs are accessed through the valve covers and are specified as NGK
PFR5G-11 or equivalent platinum-tipped plugs. The spark plug gap is set to 1.1
mm (0.043 in).
Electrical System: The engine is equipped with a 12-volt electrical system. The
starter motor is mounted to the transmission bellhousing, engaging with the
flywheel ring gear. The alternator is belt-driven from the crankshaft pulley and
provides charging current for the battery and vehicle electrical loads. The
engine control unit is located in the passenger compartment on most
applications, with sensors and actuators connected through a sealed wiring
harness.
Overall Length: 720 mm (28.3 in).
Overall Width: 680 mm (26.8 in).
Overall Height: 690 mm (27.2 in).
Dry Weight (complete engine): 180-190 kg (397-419 lbs).
Engine Oil: SAE 5W-30, 10W-30, or 10W-40 meeting API SG
or higher classification.
Oil Capacity (with filter change): 4.0-4.5 L (4.2-4.8 qt).
Oil Change Interval: 5,000-7,500 km (3,100-4,700 mi) under normal conditions.
Timing Belt Replacement Interval: 96,000 km (60,000 mi) for interference engine.
Spark Plug Type: NGK PFR5G-11 or equivalent platinum plug.
Spark Plug Gap: 1.1 mm (0.043 in).
Spark Plug Change Interval: 96,000 km (60,000 mi).
Coolant Capacity: 8.0-9.0 L (8.5-9.5 qt) depending on vehicle platform.
Coolant Specification: Ethylene glycol-based antifreeze with corrosion
inhibitors.
Coolant Change Interval: Every 2 years or 40,000 km (24,800 mi)
Engine Idle Speed: 650-750 rpm.
Compression Pressure: Standard: 1.4-1.6 MPa (203-232 psi).
Compression Pressure: Minimum service limit: 1.2 MPa (174 psi).
Connecting Rod Cap Bolts: 50 Nm (37 lb-ft) + 60° to 75°
turn.
Main Bearing Cap Bolts: 65 Nm (48 lb-ft) + 60° to 75° turn.
Cylinder Head Bolts, Stage 1: 30 Nm (22 lb-ft).
Cylinder Head Bolts, Stage 2: 60 Nm (44 lb-ft) + 90°.
Camshaft Bearing Caps: 20-25 Nm (15-18 lb-ft).
Intake Manifold to Cylinder Head: 20-25 Nm (15-18 lb-ft).
Exhaust Manifold to Cylinder Head: 30-35 Nm (22-26 lb-ft).
Flywheel/Flexplate to Crankshaft: 100-110 Nm (74-81 lb-ft).
Spark Plugs: 25 Nm (18 lb-ft).
Timing Belt Tensioner Pulley: 45 Nm (33 lb-ft).
Oil Filter Housing to Block: 25 Nm (18 lb-ft).
Water Pump Mounting: 20 Nm (15 lb-ft).
Nissan 300ZX (Z32, 1989-2000): Naturally aspirated
variants for North American and Japanese markets.
Nissan Fairlady Z (Z32, 1989-2000): Japanese domestic market naturally aspirated
variants.
Nissan Leopard (F31, 1988-1992): 3.0-liter DOHC variants.
Nissan Cedric / Gloria (Y31, 1987-1991): 3.0-liter DOHC variants with VG30DE.
Nissan Cedric / Gloria (Y32, 1991-1995): 3.0-liter DOHC variants.
Nissan Cima (FY31, 1988-1991): 3.0-liter DOHC variants.
Nissan Cima (FY32, 1991-1996): 3.0-liter DOHC variants.
Infiniti J30 (Y32, 1992-1997): Exclusive VG30DE engine with unique intake and
exhaust tuning; 210 hp output.
Nissan Maxima (J30, select markets): Limited application in certain export
regions.
Nissan Laurel (C33, select markets): 3.0-liter DOHC variants in the Japanese and
export markets.
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