Nissan SR20DET Specifications
| Engine Model: Nissan SR20DET |
| 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: 202-247 Hp (151-184 kW) at 6400 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Nissan SR20DET is a 2.0-liter, turbocharged
inline-four gasoline engine that stands as one of the most celebrated
powerplants in Nissan’s history. As the performance flagship of the SR engine
family, which debuted in the late 1980s, the SR20DET became the cornerstone of
Nissan’s sport compact and touring car lineup throughout the 1990s and into the
early 2000s. Its combination of robust construction, high specific output, and
exceptional tuning potential established a legacy that continues to define the
platform in enthusiast circles.
The engine is defined by its all-aluminum construction - a cast iron block was
foregone in favor of a lightweight aluminum cylinder block - which reduced
overall mass while maintaining structural integrity through a deep-skirt design
and a structural ladder frame. The DOHC valvetrain with sixteen valves and a
timing chain drive provided the foundation for reliable high-rpm operation.
Turbocharged variants of the SR20 were offered in multiple generations,
distinguished by progressive refinements including the introduction of variable
valve timing (VTC) on the intake camshaft, revisions to cylinder head port
geometry, and incremental increases in turbocharger efficiency. The SR20DET
powered a wide range of Nissan vehicles, from the iconic Silvia and 180SX coupes
to the all-wheel-drive Pulsar GTI-R hatchback, each variant calibrated to suit
its specific chassis and performance objectives.
The SR20DET is a four-stroke, water-cooled, turbocharged inline-four gasoline
engine configured for longitudinal mounting in rear-wheel-drive and
all-wheel-drive vehicle architectures. Its square bore and stroke ratio of 86.0
mm by 86.0 mm provides a favorable balance of piston speed and displacement
efficiency.
Engine Type: Inline-4, 4-cycle, water-cooled, turbocharged.
Displacement: 1,998 cc (121.9 cu.in).
Bore and Stroke: 86.0 mm (3.39 in) x 86.0 mm (3.39 in).
Compression Ratio: 8.5:1 (S13, S14, S15, Pulsar GTI-R).
Valvetrain: DOHC, 16-valve (4 valves per cylinder) with chain drive.
Fuel System: Multi-point electronic fuel injection (MPFI).
Firing Order: 1-3-4-2.
Timing Drive: Silent-type roller chain.
S13 Red Top / Black Top (1989-1993)
Maximum Power: 151 kW (202 hp) at 6,000 rpm.
Maximum Torque: 275 Nm (203 lb-ft) at 4,000 rpm.
Turbocharger: Garrett T25, 0.64 A/R turbine housing.
Redline: 7,500 rpm.
S14 Black Top (Notchtop) (1993-1998)
Maximum Power: 162 kW (217 hp) at 6,000 rpm.
Maximum Torque: 278 Nm (205 lb-ft) at 4,800 rpm.
Turbocharger: Garrett T28, 0.64 A/R turbine housing.
VTC: Variable timing control on intake camshaft.
Redline: 7,500 rpm.
S15 Black Top (Spec-R) (1999-2002)
Maximum Power: 184 kW (247 hp) at 6,400 rpm.
Maximum Torque: 275 Nm (203 lb-ft) at 4,800 rpm.
Turbocharger: Garrett T28 with roller bearing cartridge, 0.64 A/R turbine
housing.
VTC: Variable timing control on intake camshaft.
Redline: 7,500 rpm.
RNN14 Pulsar GTI-R (1990-1994)
Maximum Power: 169 kW (227 hp) at 6,400 rpm.
Maximum Torque: 284 Nm (210 lb-ft) at 4,800 rpm.
Turbocharger: Garrett T28, 0.86 A/R turbine housing.
Intake: Individual throttle bodies (ITB).
Redline: 7,500 rpm.
The cylinder block is manufactured from aluminum alloy
using a high-pressure die-casting process, a material selection that
significantly reduces overall engine mass compared to cast iron equivalents. The
block features a deep-skirt design, with the cylinder walls extending below the
crankshaft centerline to provide robust support for the main bearing caps and to
enhance structural rigidity under turbocharged operation. An open-deck
configuration is employed, where the cylinder bores are supported at the top
only by the water jacket perimeter, aiding in cooling efficiency.
Cast-in-place, iron-coated aluminum cylinder bores are machined directly into
the block casting, with a high-phosphorus content applied to the bore surface to
provide a durable, low-friction running surface. A structural aluminum ladder
frame - a bedplate - is bolted to the lower crankcase, incorporating the main
bearing caps and adding substantial rigidity to the bottom end. The bedplate
design utilizes six main bearing caps with four-bolt retention on the center
caps. The block incorporates an oil drain passage from the turbocharger and
provisions for an oil cooler on certain applications.
Block Material: Aluminum alloy.
Bore Diameter: 86.0 mm (3.39 in).
Main Bearing Configuration: Six main bearings with integrated bedplate,
four-bolt center caps.
Balance Shafts: Equipped on certain variants for vibration reduction.
The cylinder head is constructed from aluminum alloy
and utilizes a DOHC valvetrain with four valves per cylinder - two intake and
two exhaust. The intake camshaft is driven directly by the timing chain, while
the exhaust camshaft is driven by a secondary chain from the intake camshaft.
Hydraulic lash adjusters are integrated into the valvetrain, automatically
maintaining zero valve clearance throughout the engine’s operational life,
eliminating the need for periodic manual valve adjustments.
A defining feature of later SR20DET variants is the introduction of Variable
Timing Control (VTC) on the intake camshaft. This system uses an
oil-pressure-actuated phaser mounted at the front of the intake camshaft,
allowing continuous adjustment of intake valve timing across a range of 20
degrees of crankshaft angle. VTC improves mid-range torque, reduces turbocharger
lag, and enhances fuel efficiency.
Cylinder head port geometry distinguishes early from late variants: S13 Red Top
engines utilize a high-port head design where the intake ports are positioned
higher on the cylinder head casting; S14 and S15 Black Top engines utilize a
low-port head design with revised port angles to improve flow characteristics
and accommodate the VTC system. The Pulsar GTI-R variant features individual
throttle bodies (ITB) mounted directly to the cylinder head.
Head Material: Aluminum alloy.
Valve Configuration: DOHC, 4 valves per cylinder with hydraulic lash adjusters.
Valve Diameter (Intake): 33.0 mm (1.30 in).
Valve Diameter (Exhaust): 30.0 mm (1.18 in).
Valve Stem Diameter: 6.0 mm (0.24 in).
Valve Seat Angle: 45 degrees.
VTC Operating Range (Intake): 0-20 degrees (crankshaft angle), activated above
1,050 rpm.
The SR20DET employs a multi-point electronic fuel
injection (MPFI) system with sequential injection. Four side-feed fuel injectors
are mounted in the intake manifold runners, positioned to spray fuel directly
onto the back of the intake valves. The injector flow rate varies by generation:
S13 Red Top uses 370 cc/min injectors; S14 and S15 Black Top use 370-480 cc/min
depending on variant; the Pulsar GTI-R uses 444 cc/min top-feed injectors. A
fuel pressure regulator maintains constant fuel pressure relative to intake
manifold pressure, ensuring consistent injector operation under varying boost
conditions.
The Pulsar GTI-R variant is distinguished by its individual throttle body (ITB)
intake system, where four separate throttle bodies are mounted directly to the
cylinder head, each feeding one cylinder. This configuration provides
exceptional throttle response and high-rpm airflow at the expense of increased
complexity. A top-mounted intercooler is integrated into the Pulsar GTI-R intake
system.
Injection Type: Multi-point sequential electronic fuel injection.
Fuel Pressure: 294-314 kPa (42.6-45.5 psi) with vacuum line disconnected.
Fuel Injector Flow Rate: 370-480 cc/min depending on variant.
Fuel Requirement: 91 octane or higher (Research Octane Number 96 or higher
recommended).
The lubrication system is a fully pressurized, wet-sump
design utilizing a gear-type oil pump driven directly by the crankshaft. A
large-capacity cast aluminum oil pan incorporates a windage tray and internal
baffles to maintain oil pickup under high lateral acceleration, a critical
feature for performance applications. A full-flow, replaceable oil filter is
mounted externally, with a thermostatically controlled oil cooler integrated on
performance variants to stabilize oil temperature during sustained high-load
operation.
Pressurized oil is distributed through internal galleries to the crankshaft main
bearings, connecting rod bearings, camshaft bearings, hydraulic lash adjusters,
and the VTC phaser. Piston cooling jets - oil squirters - are integrated into
the cylinder block, directing a continuous spray of oil to the underside of each
piston crown to manage thermal loads under turbocharged operation. The
turbocharger bearing housing receives pressurized oil through a dedicated supply
line.
Oil Type: SAE 5W-30, 5W-40, 10W-40 (API SG, SH, or higher; synthetic
recommended).
Oil Capacity (with filter): 3.5-4.0 liters (3.7-4.2 US qt).
Oil Pressure (at 3,000 rpm): 294-392 kPa (42.6-56.9 psi).
Oil Pump Type: Gear-type, crankshaft-driven.
Piston Cooling Jets: Active at all engine speeds.
The cooling system is a pressurized, liquid-cooled
design engineered to manage the thermal load of a turbocharged engine in
performance driving conditions. A high-efficiency cross-flow aluminum radiator
with an electric cooling fan provides cooling capacity. A centrifugal-type water
pump, driven by the timing chain, circulates coolant through the cylinder block,
cylinder head, turbocharger bearing housing, and a water-to-oil cooler on
certain variants.
A wax-pellet thermostat regulates coolant flow to maintain optimal operating
temperature, with a bypass circuit that allows the engine to warm rapidly. The
cooling system incorporates a coolant overflow tank and provisions for a heater
circuit.
Coolant Type: Ethylene-glycol based antifreeze with corrosion inhibitors.
Coolant Capacity: 6.0-7.0 liters (6.3-7.4 US qt).
Thermostat Opening Temperature: 76-82 °C (169-180 °F).
Radiator Cap Pressure: 88-108 kPa (12.8-15.7 psi).
Water Pump Type: Centrifugal, timing chain-driven.
| Intake and Exhaust Systems |
Intake System: Air is drawn through a dry-type paper
element air filter and a hot-wire mass airflow sensor before entering the
turbocharger compressor. Compressed air passes through an air-to-air intercooler
mounted at the front of the vehicle on rear-wheel-drive variants, or a
top-mounted intercooler on the Pulsar GTI-R.
Exhaust System: Cast iron exhaust manifold with integrated turbocharger mounting
flange. The manifold is designed to minimize restriction and thermal losses. A
heated oxygen sensor is mounted upstream of the catalytic converter for fuel
trim feedback.
Distributorless ignition system with individual
pencil-type ignition coils mounted directly over each spark plug (coil-on-plug).
The engine control unit controls ignition timing based on crankshaft position,
camshaft position, mass airflow, throttle position, and knock sensor feedback. A
knock sensor mounted on the cylinder block allows the ECU to retard ignition
timing under detonation conditions.
Turbocharger System: Garrett T25 or T28 single-scroll
turbocharger with a wastegate control system. Boost pressure ranges from 0.5 bar
(7.3 psi) on early S13 variants to 0.8 bar (11.6 psi) on S15 Spec-R variants.
The Pulsar GTI-R uses a T28 with a larger 0.86 A/R turbine housing for increased
top-end power.
Timing Drive: A silent-type roller chain serves as the primary timing drive,
connecting the crankshaft sprocket to the intake camshaft sprocket. A secondary
chain connects the intake and exhaust camshafts. An automatic hydraulic
tensioner maintains optimal chain tension throughout the engine’s operational
life.
Overall Length: 610 mm (24.0 in).
Overall Width: 640 mm (25.2 in).
Overall Height: 680 mm (26.8 in).
Dry Weight (complete engine): 140 kg (309 lb).
Oil Change Interval: 5,000 km (3,000 mi) under normal
driving conditions.
Oil Change Interval: 3,000 km (1,800 mi) under severe or performance driving
conditions.
Oil Filter Change: At every oil change.
Timing Chain: Inspection for stretch and tensioner function every 100,000 km
(60,000 mi).
Engine Coolant Replacement: 60,000 km (40,000 mi) or 2 years.
Spark Plug Replacement: 40,000 km (25,000 mi) for standard plugs.
Spark Plug Replacement: 60,000 km (37,000 mi) for iridium plugs.
Spark Plug Type: NGK BKR6E-11 or BKR7E-11 (heat range varies with tuning).
Spark Plug Gap: 0.8-1.1 mm (0.031-0.043 in) depending on ignition system and
boost level.
Drive Belt (Accessory) Inspection: Every 10,000 km (6,000 mi) for tension,
cracking, and glazing.
Air Filter Replacement: 30,000 km (18,000 mi) or as indicated by inspection.
Fuel Filter Replacement: 40,000 km (25,000 mi) for external filter types.
VTC System: Inspect for proper operation during routine service.
Cylinder Head Bolts (M10 x 1.25), 1st pass: 20 Nm (15
lb-ft).
Cylinder Head Bolts (M10 x 1.25), 2nd pass: 40 Nm (30 lb-ft) + 75° rotation.
Main Bearing Bedplate Bolts (M10 x 1.25): 20 Nm (15 lb-ft) + 90° rotation.
Connecting Rod Cap Bolts (M9 x 1.0): 20 Nm (15 lb-ft) + 90° rotation.
Camshaft Bearing Cap Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft).
Intake Manifold Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft).
Exhaust Manifold Nuts (M8 x 1.25): 25-30 Nm (18-22 lb-ft).
Spark Plugs: 20-25 Nm (15-18 lb-ft).
Oil Pan Bolts (M6 x 1.0): 8-10 Nm (71-89 lb-in).
Water Pump Bolts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
VTC Phaser Bolt (M12 x 1.25): 45-50 Nm (33-37 lb-ft).
Crankshaft Pulley Bolt (M14 x 1.5): 180-200 Nm (133-148 lb-ft).
Flywheel / Drive Plate Bolts (M10 x 1.25): 45 Nm (33 lb-ft) + 75° rotation.
The Nissan SR20DET engine was utilized across a broad
range of Nissan’s performance-oriented and touring vehicle lineup throughout the
1990s and early 2000s, primarily in the Japanese Domestic Market.
Nissan Silvia (S13, S14, S15): 1989-2002 model years (turbocharged variants).
Nissan 180SX (S13): 1991-1998 model years (turbocharged variants).
Nissan Pulsar GTI-R (RNN14): 1990-1994 model years.
Nissan Bluebird (U12, U13): 1989-1995 model years (SSS and ATTESA turbo
variants).
Nissan Avenir (W10, W11): 1995-2002 model years (GT and GT4 variants).
Nissan R’nessa (N30): 1997-2001 model years (GT and GT4 variants).
Nissan Liberty (M12): 1998-2001 model years (GT and GT4 variants).
Nissan Wingroad (W10, W11): 1996-2002 model years (GT and GT4 variants).
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