Opel A16LET Specifications
| Engine Model: Opel A16LET |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve turbocharged liquid-cooled gasoline |
| Total Displacement: 97.5 cu.in (1.59 L) |
| Rated Engine Power: 180 Hp (132 kW) at 5500 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Opel A16LET, designated LLU within the GM family,
is a 1.6-liter turbocharged inline-four petrol engine belonging to the GM Family
1 (Ecotec) series. Produced between 2007 and 2014, the A16LET was engineered as
a performance-oriented powerplant, combining a robust cast iron cylinder block
with aluminum alloy cylinder head, dual overhead camshafts, and a turbocharger
with intercooler.
The engine features continuously variable camshaft phasing on the intake side
and multi-point fuel injection, achieving a specific output exceeding 110 hp per
liter. The A16LET powered high-performance variants of Opel’s Corsa, Astra,
Insignia, and Meriva models, delivering strong mid-range torque supported by an
overboost function that temporarily increased output under full-load conditions.
Engine Type: Inline 4-cylinder, 4-cycle, water-cooled, turbocharged gasoline.
Displacement: 1,598 cc (97.5 cu.in).
Bore: 79.0 mm (3.11 in).
Stroke: 81.5 mm (3.21 in).
Compression Ratio: 8.8:1.
Firing Order: 1-3-4-2.
Maximum Power: 180 hp (132 kW) @ 5,500 rpm.
Maximum Torque: 230 Nm (170 lb-ft) @ 2,200-5,400 rpm.
Emission Standard: Euro 5.
Valvetrain Configuration: Dual Overhead Camshaft (DOHC) operating 16 valves (4
valves per cylinder). The intake camshaft is equipped with a continuously
variable camshaft phasing system. Camshafts are driven by a toothed timing belt.
The cylinder block is manufactured from cast iron with
an open-deck design. Bore diameter measures 79.0 mm (3.11 in). The cast iron
construction provides the rigidity required to withstand elevated cylinder
pressures generated by forced induction. The crankshaft is forged steel with
eight counterweights, supported by five main bearings.
The block incorporates an integrated oil gallery system feeding the main
bearings, connecting rods, and turbocharger lubrication circuit. The cylinder
bores are machined with a plateau honed finish and utilize cast iron liners
integrally cast into the block.
The cylinder head is manufactured from aluminum alloy
with pent-roof combustion chambers and cross-flow port architecture.
Valves: 16 total; 8 intake, 8 exhaust.
Intake Valve Diameter: 33.0 mm (1.30 in).
Exhaust Valve Diameter: 28.5 mm (1.12 in).
Valve Stem Diameter: 5.0 mm (0.20 in) for both intake and exhaust.
Valve Seat Inserts: Powder metal sintered alloy with multi-angle seat geometry.
Valve Guides: Press-fit sintered iron guides.
Hydraulic Lash Adjusters: Direct-acting units mounted in the cylinder head
casting, operating on bucket-type cam followers. These adjusters automatically
maintain zero valve clearance throughout engine life.
Camshafts: Chilled cast iron camshafts with induction-hardened lobes. The intake
camshaft incorporates a variable camshaft phasing actuator with an adjustment
range of 60 degrees (30 degrees advance, 30 degrees retard). The system is
controlled by the engine control unit via an oil control valve.
Continuous Variable Camshaft Phasing: The system adjusts intake cam timing
continuously across the engine speed and load range, optimizing volumetric
efficiency, reducing pumping losses, and improving turbocharger response. Valve
Springs: Progressive-rate springs designed for the elevated engine speeds and
forced induction environment.
The fuel system employs multi-point fuel injection with
sequential injection timing. Injection Type: Sequential multi-port injection
with fuel injectors positioned in the intake manifold runners adjacent to each
intake port.
Engine Management System: Bosch or Siemens ECU with integrated boost control,
utilizing inputs from a mass airflow sensor (hot-film type), throttle position
sensor, coolant temperature sensor, intake air temperature sensor, crankshaft
position sensor, camshaft position sensor, oxygen sensors (pre-catalyst and
post-catalyst), and manifold absolute pressure sensor.
Fuel Pressure: Regulated to 3.5-4.0 bar (51-58 psi) via a vacuum-referenced fuel
pressure regulator integrated into the fuel rail. Injector Flow Rate: 350-380
cc/min at standard operating pressure. Fuel Pump: In-tank electric fuel pump
with flow rate calibrated for forced induction operation.
Intake Manifold: Composite plastic manifold with integrated charge air cooler
(air-to-air intercooler) positioned upstream of the throttle body. The manifold
incorporates a resonance chamber and an electronically controlled throttle body.
The lubrication system is a full-flow, pressurized
design utilizing a rotor-type oil pump driven by the crankshaft. Oil Pump Type:
Internal gear (gerotor) pump mounted to the front of the crankshaft, housed
within the front timing cover assembly. Oil Capacity: 4.5 liters (4.8 qt)
including oil filter replacement.
Recommended Oil Viscosity: 5W-30 fully synthetic. Oil Quality Requirement: GM
dexos2 specification. ACEA C3 for models with gasoline particulate filter where
equipped. Oil Pressure: At warm idle, pressure ranges from 1.2-1.8 bar (17-26
psi). At 3,000 rpm, pressure reaches 3.5-4.5 bar (51-65 psi).
Oil Cooler: Liquid-to-oil plate-type heat exchanger integrated into the oil
filter housing, utilizing engine coolant for thermal stabilization of oil
temperature under turbocharged operation. Oil Filter: Cartridge-type filter
housed within a modular housing accessible from the engine top or under-vehicle
location. Crankcase Ventilation: Closed PCV system with an integrated oil
separator incorporated into the valve cover. Blow-by gases are routed to the
turbocharger compressor inlet.
The cooling system is pressurized and utilizes a
centrifugal water pump driven by the timing belt. Water Pump Type: Centrifugal
pump with a die-cast aluminum housing and stamped steel impeller. Thermostat:
Wax-pellet type with integrated housing. Opening temperature is 82-88 °C
(180-190 °F). Coolant Capacity: 6.5-7.0 liters (6.9-7.4 qt) inclusive of engine
block, heater core, radiator, and turbocharger cooling circuit.
Radiator: High-efficiency aluminum cross-flow core with plastic end tanks.
Cooling fan configuration consists of dual electric fans with variable speed
control based on coolant temperature, charge air temperature, and air
conditioning load. System Pressure: Radiator cap rated at 1.1-1.2 bar (16-17
psi).
Turbocharger Cooling: The turbocharger bearing housing is integrated into the
engine cooling circuit. An auxiliary electric water pump continues coolant
circulation after engine shutdown to prevent heat soak and coking of the
turbocharger bearings. Coolant Specification: Phosphate and silicate-free
ethylene glycol-based coolant meeting GM specifications for aluminum engine
construction.
Ignition System: Direct ignition system with individual
pencil-type ignition coils mounted directly over each spark plug (coil-on-plug).
The system utilizes a crankshaft position sensor and a camshaft position sensor
for sequential ignition timing. Spark Plug Type: NGK PFR6T-G or equivalent.
Spark Plug Gap: 0.7-0.8 mm (0.028-0.031 in).
Timing System: Toothed timing belt constructed from high-tensile rubber with
fiber reinforcement. The belt drives the intake and exhaust camshafts and the
water pump. An automatic spring-loaded tensioner maintains belt tension.
Replacement interval is 150,000 km (93,000 miles) or 10 years; a reduced
interval of 100,000 km (62,000 miles) is recommended in severe service
conditions.
Turbocharger System: Single turbocharger with fixed geometry or variable nozzle
turbine depending on production date. The turbocharger features a water-cooled
bearing housing and an electronically controlled wastegate. Boost pressure is
regulated by the engine control unit based on load, engine speed, and knock
sensor input. Maximum boost pressure is approximately 0.8-1.0 bar (12-15 psi).
Intercooler: Air-to-air charge air cooler mounted in the front bumper area,
reducing intake air temperature after compression to increase charge density.
Exhaust System: Cast iron exhaust manifold with integrated turbocharger mounting
flange. A close-coupled catalytic converter is mounted immediately downstream of
the turbocharger for rapid light-off during cold starts.
Overboost Function: Under full-load conditions, the engine control unit
temporarily increases boost pressure and adjusts fuel delivery to provide 266 Nm
(196 lb-ft) of torque for a limited duration, enhancing overtaking and
acceleration performance.
Overall Length: 620 mm (24.4 in) measured from
accessory drive pulley face to transmission mounting flange.
Overall Width: 620 mm (24.4 in) inclusive of intake manifold, turbocharger
assembly, and exhaust manifold.
Overall Height: 680 mm (26.8 in) from oil pan bottom surface to valve cover top
surface.
Dry Weight: 125-135 kg (276-298 lb) depending on turbocharger configuration and
accessory drive components.
Valve Clearance: Hydraulic lash adjusters operate
automatically. No periodic adjustment required. Timing Belt Replacement
Interval: 150,000 km (93,000 miles) or 10 years. Many specialists recommend
replacement at 100,000 km (62,000 miles) for forced induction applications.
Spark Plug Replacement Interval: 60,000 km (37,000 miles). Drive Belt Tension
(Accessory): Automatic tensioner maintains correct tension; no manual adjustment
required. Belt replacement interval is 80,000 km (50,000 miles). Coolant Change
Interval: 80,000 km (50,000 miles) or 4 years.
Engine Oil Change Interval: 10,000 km (6,200 miles) or 12 months, whichever
occurs first. Shorter intervals of 7,500 km (4,700 miles) are recommended for
vehicles frequently operated under high-load conditions. Idle Speed (warm,
neutral): 750-800 rpm. Ignition Timing: Electronically controlled with no manual
adjustment provision. Fuel Pressure: 3.5-4.0 bar (51-58 psi) at idle with vacuum
line connected.
Cylinder Head Bolts (cold): 30 Nm (22 lb-ft) plus 90°
rotation.
Crankshaft Damper Pulley Bolt: 180-200 Nm (133-148 lb-ft).
Connecting Rod Cap Bolts: 20 Nm (15 lb-ft) plus 90° rotation.
Main Bearing Cap Bolts: 30 Nm (22 lb-ft) plus 90° rotation.
Camshaft Bearing Cap Bolts: 10-12 Nm (7-9 lb-ft).
Camshaft Sprocket Bolts: 80-90 Nm (59-66 lb-ft).
Camshaft Phaser Actuator Bolt: 80-90 Nm (59-66 lb-ft).
Valve Cover Bolts: 8-10 Nm (6-7 lb-ft).
Intake Manifold Bolts: 20-25 Nm (15-18 lb-ft).
Exhaust Manifold Nuts: 25-30 Nm (18-22 lb-ft).
Turbocharger Mounting Nuts: 40-45 Nm (30-33 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Timing Belt Tensioner Bolt: 20-25 Nm (15-18 lb-ft).
Water Pump Bolts: 20-25 Nm (15-18 lb-ft).
Fuel Rail Mounting Bolts: 20-25 Nm (15-18 lb-ft).
Flywheel / Drive Plate Bolts: 90-100 Nm (66-74 lb-ft) plus 90° rotation.
Engine Mount Bracket Bolts: 45-55 Nm (33-41 lb-ft).
Spark Plugs: 20-25 Nm (15-18 lb-ft).
Opel Corsa D OPC / VXR: 2007-2010. The A16LET powered
the high-performance Corsa D OPC (Opel) and VXR (Vauxhall) hot hatchback,
producing 180 hp (132 kW) with overboost function. This application utilized a
front-mounted intercooler and a performance-oriented exhaust system.
Opel Astra J: 2009-2014. The A16LET was installed in the Astra J as the 1.6
Turbo engine option, available in 180 hp (132 kW) calibration in GTC and
sport-oriented trims. The engine was paired with either a six-speed manual or
six-speed automatic transmission.
Opel Insignia A: 2008-2014. The A16LET served as the entry-level turbocharged
powertrain in the Insignia A, offered in both sedan and Sports Tourer body
styles. In this application, the engine was calibrated for 180 hp (132 kW) with
a focus on mid-range torque suitable for a larger vehicle platform.
Opel Meriva A OPC: 2007-2010. The A16LET powered the Meriva A OPC, a
high-performance compact multi-purpose vehicle (MPV), producing 180 hp (132 kW)
with overboost function. This application featured revised engine mounts and a
cooling system optimized for the Meriva’s engine bay configuration.
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