Nissan SR20VET Specifications
| Engine Model: Nissan SR20VET |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve turbocharged liquid-cooled gasoline |
| Total Displacement: 121.9 cu.in (1.99 L) |
| Rated Engine Power: 276 Hp (206 kW) at 6400 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Nissan SR20VET is a 2.0-liter, turbocharged
inline-four gasoline engine produced exclusively for the Japanese domestic
market from 2001 to 2007. It represents the pinnacle of the SR engine family,
combining forced induction with Nissan’s Neo VVL (Variable Valve Lift and
Timing) technology - a configuration that was never offered in export markets.
The SR20VET was engineered as the exclusive powerplant for the Nissan X-Trail
GT, a high-performance variant of the compact SUV that utilized a full-time
all-wheel-drive system. This engine’s development drew upon the racing heritage
of the naturally aspirated SR20VE and the turbocharged SR20DET, merging the
high-flow cylinder head architecture of the former with the forced induction
robustness of the latter.
The result was an engine that delivered peak power output at the Japanese
market’s voluntary 280 ps (276 hp) limit while generating substantial low-end
torque from the turbocharger’s rapid spool characteristics. The engine’s
production run coincided with the period when Nissan was transitioning its
performance engine development toward the MR and VQ families, making the SR20VET
one of the final and most technologically advanced iterations of the
long-running SR series.
The SR20VET engine represents a unique convergence of technologies within the SR
engine lineage, distinguished by its combination of a factory turbocharger with
the Neo VVL variable valve lift system. The engine’s square bore and stroke
dimensions of 86.0 mm x 86.0 mm yield a displacement of 1,998 cc, a
configuration that balances high-rpm power potential with adequate low-speed
torque.
The aluminum alloy cylinder block incorporates cast-iron cylinder liners for
durability under boost pressures, while the cylinder head features the high-flow
port design developed for the SR20VE, with the Neo VVL system applied to the
intake valves to optimize charge motion across the engine speed range. The
Garrett GT2560LS turbocharger is sized to provide rapid boost response,
achieving peak torque at 3,200 rpm - a notably low engine speed for a 2.0-liter
turbocharged engine of this era. The engine management system utilizes Nissan’s
ECCS (Electronic Concentrated Control System) with sequential fuel injection and
coil-on-plug ignition.
A drive-by-wire electronic throttle body replaces the traditional cable-actuated
throttle, enabling precise torque management integrated with the X-Trail’s
all-wheel-drive system. The SR20VET’s exclusivity - it was installed in only one
vehicle model - has contributed to its status among Nissan enthusiasts, though
its compact SUV application and Japanese market restriction have limited its
recognition relative to the more widely exported SR20DET.
Production Period: 2001-2007.
Engine Code: SR20VET.
Configuration: Inline four-cylinder (I4).
Displacement: 1,998 cc (121.9 cu.in).
Bore: 86.0 mm (3.39 in).
Stroke: 86.0 mm (3.39 in).
Firing Order: 1-3-4-2.
Compression Ratio: 9.0:1 (officially rated; some references indicate 8.8:1).
Combustion System: Sequential multipoint electronic fuel injection (ECCS).
Aspiration: Single turbocharger with intercooler.
Valvetrain: DOHC, 16 valves (4 per cylinder), Neo VVL on intake.
Maximum Engine Speed: 7,000 rpm (redline).
Maximum Power: 280 ps (276 hp / 206 kW) @ 6,400 rpm.
Maximum Torque: 228 lb-ft (309 Nm) @ 3,200 rpm.
The SR20VET cylinder block is manufactured from cast
aluminum alloy, utilizing a closed-deck design to enhance structural rigidity
under the increased cylinder pressures generated by turbocharging. Cast-iron
cylinder liners are inserted during the casting process, providing a durable
wear surface compatible with the piston rings and ensuring longevity under high
thermal and mechanical loads. The block features a deep-skirt design that
extends below the crankshaft centerline, contributing to reduced vibration and
improved main bearing alignment.
Five main bearings support the crankshaft, with the bearing caps secured using
high-tensile steel bolts. The crankshaft is constructed from forged steel, a
specification carried over from the SR20DET, to withstand the torsional stresses
of turbocharged operation. Oil jets are integrated into the block, directed at
the underside of the pistons to provide cooling and reduce the risk of
detonation-induced damage under sustained high-load conditions. The block
incorporates the mounting provisions for the oil pump, water pump, and the
timing chain drive system at the front.
The cylinder head is manufactured from cast aluminum
alloy and features a dual-overhead-camshaft (DOHC) arrangement with 16 valves.
The Neo VVL (Variable Valve Lift and Timing) system is applied to the intake
camshaft, utilizing a hydraulically actuated mechanism that switches between two
distinct cam profiles.
This system, derived from the naturally aspirated SR20VE, allows the engine to
operate with a low-lift, short-duration profile for enhanced low-speed torque
and fuel efficiency, transitioning to a high-lift, long-duration profile for
increased volumetric efficiency at higher engine speeds. The exhaust camshaft
features conventional fixed timing and lift. The intake valves are actuated via
rocker arms that incorporate the VVL switching mechanism, while the exhaust
valves are actuated through direct-acting bucket tappets.
The cylinder head utilizes a pent-roof combustion chamber design with centrally
positioned spark plugs. The intake ports are designed with a straight, high-flow
configuration to maximize airflow into the cylinders, while the exhaust ports
are optimized to reduce backpressure and promote rapid turbocharger spool. Valve
diameters are 35.0 mm (1.38 in) for the intake valves and 30.0 mm (1.18 in) for
the exhaust valves.
The fuel system utilizes Nissan’s ECCS (Electronic
Concentrated Control System) sequential multipoint fuel injection, with a fuel
injector positioned at each intake port. The system operates at a nominal fuel
pressure of 3.0 bar (44 psi), regulated by a fuel pressure regulator mounted on
the fuel rail. Fuel is delivered from an in-tank fuel pump through a filter and
to the fuel rail, which is constructed from stainless steel to withstand the
pressures and thermal conditions of the engine bay.
The injectors are selected for flow rates commensurate with the engine’s power
output, operating at a duty cycle managed by the engine control unit. The engine
control unit calculates injector pulse width based on inputs including mass
airflow, engine speed, throttle position, coolant temperature, and intake air
temperature. The system incorporates a hot-wire mass airflow sensor located in
the intake tract upstream of the turbocharger, 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 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, and the VVL switching mechanism.
Dedicated piston cooling oil jets are supplied from the main oil gallery,
directing a continuous stream of oil to the underside of each piston crown to
manage combustion temperatures under boost. An oil cooler is integrated into the
system, utilizing engine coolant to maintain oil temperature within the optimal
range. Total system capacity, including the filter and oil cooler, is 4.5 liters
(4.8 qt).
The cooling system is a pressurized water-cooled design
utilizing a high-efficiency aluminum radiator with plastic end tanks, sized to
manage the additional thermal load generated by the turbocharger. A centrifugal
water pump, driven by the timing chain or accessory belt depending on the
iteration, circulates coolant through the cylinder block, cylinder head, and
radiator.
The system incorporates a wax-element thermostat with a nominal opening
temperature of 76.5°C (170°F) to maintain the engine at an operating temperature
conducive to power output while providing sufficient thermal margin. An electric
cooling fan, controlled by the engine control unit, provides airflow across the
radiator during low-speed operation and stationary idle.
The turbocharger is integrated into the cooling circuit, with coolant
circulating through the turbocharger bearing housing to prevent oil coking after
engine shutdown. A separate oil-to-water heat exchanger for the engine oil is
integrated into the system. Coolant capacity is 7.0 liters (7.4 qt).
| Intake and Exhaust Systems |
Intake System: The intake system consists of an air
cleaner housing with a dry-type filter element, the mass airflow sensor, a duct
to the turbocharger compressor inlet, the intercooler, and the intake manifold.
The intake manifold is constructed from aluminum and is designed with tuned
runners to optimize airflow distribution across all four cylinders. The
drive-by-wire electronic throttle body, located between the intercooler outlet
and the intake manifold, provides precise control of intake airflow under all
operating conditions.
Exhaust System: The exhaust system utilizes a cast iron exhaust manifold
designed to maintain exhaust gas velocity for rapid turbocharger spool while
withstanding the thermal cycling of turbocharged operation. The manifold is a
log-style design with the turbocharger flange positioned centrally to minimize
flow losses. The system incorporates a catalytic converter downstream of the
turbocharger and a stainless steel exhaust pipe with a resonator and muffler.
| Ignition and Electrical System |
Ignition System: The ignition system utilizes a direct
coil-on-plug design, with individual ignition coils mounted directly over each
spark plug. This configuration eliminates high-tension ignition wires, reducing
electromagnetic interference and ensuring consistent spark energy delivery
across the engine speed range. The engine control unit manages ignition timing
based on inputs including engine speed, load, knock sensor feedback, and intake
air temperature.
Electrical System: The engine is equipped with a 12-volt electrical system. The
starter motor is a reduction-gear type, sized to provide adequate cranking
torque for the 9.0:1 compression ratio. The alternator is a high-output unit to
support the electrical demands of the engine control system, fuel pump, cooling
fans, and vehicle accessories. The engine control unit utilizes a 32-bit
processor with integrated control for fuel injection, ignition timing, boost
pressure, and the VVL switching mechanism.
The SR20VET is equipped with a Garrett GT2560LS
turbocharger, featuring a ball-bearing cartridge for reduced friction and
improved transient response. The compressor housing is sized to provide rapid
boost onset, with the wastegate actuator calibrated to regulate maximum boost
pressure to approximately 0.7 bar (10 psi) in factory configuration. An
air-to-air intercooler is mounted in the front of the vehicle to reduce intake
air temperature before it enters the intake manifold, increasing charge density
and reducing the risk of detonation.
Overall Length: 650 mm (25.6 in).
Overall Width: 620 mm (24.4 in).
Overall Height: 680 mm (26.8 in).
Dry Weight (complete engine): 150 kg (331 lbs).
Engine Oil: Synthetic SAE 5W-30, 5W-40, or 10W-40
meeting API SN or higher.
Oil Capacity (with filter change): 4.5 L (4.8 qt).
Oil Change Interval: 5,000 km (3,100 mi) under severe conditions.
Oil Change Interval: 10,000 km (6,200 mi) under normal use.
Timing Chain: Chain-driven with hydro tensioner; inspection at 160,000 km
(100,000 mi).
Spark Plug Type: NGK IFR6E-11 or equivalent iridium plug.
Spark Plug Gap: 1.1 mm (0.043 in).
Spark Plug Change Interval: 96,000 km (60,000 mi).
Coolant Capacity: 7.0 L (7.4 qt).
Coolant Specification: Ethylene glycol-based antifreeze with corrosion
inhibitors.
Coolant Change Interval: Replace every 2 years or 40,000 km (24,800 mi).
Valve Clearance: Hydraulic lash adjusters on exhaust; VVL system on intake
requires no manual adjustment. Engine Idle Speed: 750-800 rpm.
Turbocharger: Garrett GT2560LS; bearing inspection at 120,000 km (75,000 mi).
Connecting Rod Cap Bolts: 45 Nm (33 lb-ft) + 60° to 75°
turn
Main Bearing Cap Bolts: 40 Nm (30 lb-ft) + 60° to 75° turn
Cylinder Head Bolts (M10), Stage 1: 30 Nm (22 lb-ft)
Cylinder Head Bolts (M10), Stage 2: 60 Nm (44 lb-ft) + 90° + 90°
Camshaft Bearing Caps: 15 Nm (11 lb-ft) for M6
Camshaft Bearing Caps: 25 Nm (18 lb-ft) for M8
Intake Manifold to Cylinder Head: 20-25 Nm (15-18 lb-ft)
Exhaust Manifold to Cylinder Head: 35-40 Nm (26-30 lb-ft)
Turbocharger Mounting Nuts: 45-50 Nm (33-37 lb-ft)
Flywheel/Flexplate to Crankshaft: 100 Nm (74 lb-ft) + 60° to 75° turn
Spark Plugs: 25 Nm (18 lb-ft)
Oil Filter Housing to Block: 25 Nm (18 lb-ft)
Throttle Body Mounting: 10 Nm (7 lb-ft)
Nissan X-Trail GT (PNT30).
Production Period: 2001-2007
Model Code: PNT30.
Drive Configuration: Full-time all-wheel drive (AWD) with rear-biased torque
distribution.
Transmission: 5-speed manual transmission only.
Markets: Exclusive to Japanese domestic market (JDM).
Chassis Features: The X-Trail GT utilized the SR20VET engine as its sole
powertrain option, distinguished by unique exterior and interior elements
including a raised hood with a power bulge, specific front and rear bumpers, and
interior trim differentiating it from standard X-Trail models.
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