Mazda LF-VD Specifications
| Engine Model: Mazda LF-VD |
| Engine Type: 4-cycle 4-cylinder DOHC 16-valve S-VT VIS liquid-cooled gasoline |
| Total Displacement: 122 cu.in (1.99 L) |
| Rated Engine Power: 148-153 Hp (110-114 kW) at 6200 rpm |
| Fuel System Type: Direct Injection Spark Ignition |
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The Mazda LF-VD is a 2.0-liter, naturally aspirated
four-cylinder engine from the MZR family. It is distinguished as the first MZR
engine to feature DISI (Direct Injection Spark Ignition) technology, designed to
provide superior fuel economy and enhanced low-end torque compared to the
standard LF-VE port-injected variant.
Introduced in the late 2000s, this engine represented Mazda’s strategic shift
toward direct injection as a means of improving thermal efficiency and reducing
emissions without resorting to turbocharging. The LF-VD was engineered to
deliver a responsive driving experience while maintaining the reliability
characteristics for which the MZR family is known.
The LF-VD engine is regarded as a sophisticated evolution of the MZR platform,
leveraging direct injection to achieve a higher compression ratio than its
port-injected predecessor. This technology allows for a cooler intake charge and
more precise fuel metering, resulting in improved throttle response and a
broader torque curve. The incorporation of sequential valve timing (S-VT) on the
intake camshaft and a variable intake system (VIS) further optimizes volumetric
efficiency across the engine speed range.
The engine’s all-aluminum construction contributes to reduced vehicle mass,
while the timing chain eliminates scheduled replacement intervals. Many LF-VD
variants were integrated with Mazda’s i-stop start-stop system, which utilizes
combustion energy for rapid restarts, enhancing fuel efficiency in urban driving
conditions.
Engine Type: Inline 4-cylinder, 4-cycle, water-cooled gasoline engine.
Displacement: 1,999 cc (122.0 cu.in), equivalent to 2.0 L.
Valvetrain: DOHC, 16 valves (4 per cylinder).
Fuel System: Direct Injection Spark Ignition (DISI) with high-pressure fuel
delivery.
Bore: 87.5 mm (3.44 in).
Stroke: 83.1 mm (3.27 in).
Compression Ratio: 11.2:1.
Firing Order: 1-3-4-2.
Maximum Power: 110-114 kW (148-153 hp) @ 6,200 rpm.
Maximum Torque: 186-193 Nm (137-142 lb-ft) @ 4,000-4,500 rpm.
Redline: 6,500 rpm.
Idle Speed: 650-750 rpm, varying with engine temperature and accessory load.
The cylinder block is constructed from aluminum alloy
with cast-iron cylinder liners to provide a durable wear surface for the piston
rings. This open-deck design reduces overall engine mass while maintaining
adequate structural rigidity for a naturally aspirated application. The block
incorporates a deep-skirt configuration that extends below the crankshaft
centerline, enhancing torsional stiffness and minimizing noise, vibration, and
harshness (NVH).
Integrated within the block are the water jackets surrounding each cylinder
bore, as well as oil galleries supplying the crankshaft main bearings and the
piston cooling jets. The bedplate design, where a separate aluminum ladder frame
reinforces the main bearing caps, contributes to crankshaft stability under
high-rpm operation.
The cylinder head is manufactured from aluminum alloy
and houses the DOHC arrangement with four valves per cylinder. The combustion
chambers feature a pent-roof design optimized for direct injection, with the
centrally located injector positioned between the intake valves. Intake valves
measure 33.0 mm (1.30 in) in diameter, while exhaust valves measure 28.0 mm
(1.10 in).
The valvetrain utilizes hydraulic lash adjusters and roller finger followers,
which reduce friction and eliminate the need for manual valve clearance
adjustments. The intake camshaft is equipped with S-VT (Sequential Valve
Timing), a hydraulically actuated variable valve timing mechanism that adjusts
camshaft phase relative to the crankshaft based on engine load and speed. The
exhaust camshaft does not feature variable timing.
The fuel system employs a DISI (Direct Injection Spark
Ignition) architecture operating at high pressure. A camshaft-driven
high-pressure fuel pump, mounted on the cylinder head, generates fuel pressures
up to 150 bar (2,175 psi) during operation. This pump delivers fuel to a common
rail mounted transversely across the cylinder head. Six-hole solenoid injectors
spray fuel directly into each combustion chamber during the intake stroke or
compression stroke, depending on operating conditions.
The system operates in two primary modes: homogeneous combustion for most
driving conditions, where fuel is injected during the intake stroke to create a
uniform air-fuel mixture; and stratified combustion under light loads, where
fuel is injected late in the compression stroke to create a concentrated mixture
near the spark plug. This stratification enables lean-burn operation and
improves fuel efficiency.
The lubrication system is a forced-feed, wet-sump type
utilizing a rotor-type oil pump mounted to the front of the crankshaft. The pump
is driven directly by the crankshaft, ensuring immediate oil pressure upon
startup. Oil is drawn from an aluminum oil pan through a baffled strainer before
being pressurized and routed through a full-flow cartridge-type oil filter.
The system supplies lubricant to the crankshaft main bearings, connecting rod
bearings, camshaft journals, hydraulic lash adjusters, and roller finger
followers. Piston cooling is provided by oil jets located in the cylinder block,
which direct oil to the underside of each piston crown to manage thermal loads
under high engine speeds and sustained loads. The oil pan incorporates a baffle
design to maintain oil supply to the pump under cornering and braking forces.
The cooling system is a pressurized, water-cooled setup
utilizing a centrifugal water pump driven by the engine’s serpentine accessory
belt. A wax-type thermostat with a rated opening temperature of 82°C (180°F)
regulates engine operating temperature. Coolant circulates through the aluminum
cylinder block and cylinder head before passing through a cross-flow radiator
equipped with an electric cooling fan.
The system includes a separate coolant circuit for the heater core and, in
vehicles equipped with i-stop, an additional electric coolant pump maintains
cabin heating when the engine is stopped during start-stop events. The cylinder
head incorporates integrated exhaust manifold passages in some LF-VD iterations,
requiring specific cooling channel routing to manage thermal gradients.
Ignition System: The engine uses a direct ignition
system with individual pencil-type ignition coils mounted directly over each
spark plug. The iridium-tipped spark plugs are designed for extended service
intervals commensurate with the direct injection system’s demands.
Timing System: The camshafts are driven by a silent-type timing chain. The
system consists of a single chain connecting the crankshaft sprocket, intake
camshaft sprocket (which houses the S-VT actuator), and exhaust camshaft
sprocket. A hydraulic chain tensioner, supplied with oil pressure from the
lubrication system, maintains consistent chain tension. No scheduled replacement
interval is specified for the timing chain.
Variable Induction System (VIS): The intake manifold incorporates a
variable-length runner system. A set of intake air control valves alters the
effective runner length based on engine rpm. Shorter runners are utilized at
higher engine speeds to favor peak power, while longer runners are employed at
lower engine speeds to enhance intake air velocity and torque production.
i-stop (Start-Stop System): In applications equipped with Mazda’s i-stop system,
the engine management system monitors piston position during shutdown. Upon
restart, fuel is injected into a cylinder with the piston positioned in the
power stroke, and ignition occurs, using combustion energy to assist the starter
motor. This system enables rapid restarts with reduced vibration compared to
starter-only systems.
Electronic Throttle Control: A drive-by-wire throttle body, controlled by the
Engine Control Unit (ECU), eliminates the mechanical cable linkage. The system
integrates with the stability control, cruise control, and i-stop functions to
provide precise airflow management.
Overall Engine Length: 520 mm (20.47 in).
Overall Engine Width: 630 mm (24.80 in).
Overall Engine Height: 670 mm (26.38 in).
Dry Weight: The complete engine assembly weighs 118 kg (260 lb), inclusive of
the intake manifold, fuel system components, and exhaust manifold.
Engine Oil Capacity (with Filter): 4.3 liters (4.5 qt).
Engine Oil Specification: SAE 5W-20 or 5W-30 meeting API SN or ILSAC GF-5
specifications. Mazda recommends oils meeting their proprietary specification
for direct injection engines. Coolant Capacity: 7.2 liters (7.6 qt) inclusive of
the radiator and heater circuit. Fuel Injector Cleaning: Periodic use of
top-tier fuel is recommended to prevent carbon accumulation on intake valves, a
consideration common to direct injection engines.
Spark Plug Type: NGK ILTR5A-13G or equivalent iridium-tipped plug. Spark Plug
Gap: 1.2-1.3 mm (0.047-0.051 in). Spark Plug Replacement Interval: 120,000 km
(75,000 mi). Valve Clearance: Hydraulic lash adjusters automatically maintain
clearance; no manual adjustment is required. Timing Chain Inspection: Inspection
of the chain tensioner and guide wear is recommended at 160,000 km (100,000 mi)
if engine noise is evident.
Cylinder Head Bolts, Step 1: 20.0 Nm (2.0 kgf-m, 15
lb-ft).
Cylinder Head Bolts, Step 2: 50.0 Nm (5.1 kgf-m, 37 lb-ft).
Main Bearing Cap Bolts (Bedplate), Step 1: 20.0 Nm (2.0 kgf-m, 15 lb-ft).
Main Bearing Cap Bolts (Bedplate), Step 2: 40.0 Nm (4.1 kgf-m, 30 lb-ft).
Connecting Rod Cap Bolts: 20.0 Nm (2.0 kgf-m, 15 lb-ft).
Camshaft Bearing Cap Bolts: 12.0-14.0 Nm (1.2-1.4 kgf-m, 9-10 lb-ft).
Intake Manifold Bolts: 18.0-22.0 Nm (1.8-2.2 kgf-m, 13-16 lb-ft).
Exhaust Manifold Nuts: 35.0-45.0 Nm (3.6-4.6 kgf-m, 26-33 lb-ft).
Crankshaft Pulley Bolt: 180.0-200.0 Nm (18.4-20.4 kgf-m, 133-148 lb-ft).
Spark Plugs: 15.0-22.0 Nm (1.5-2.2 kgf-m, 11-16 lb-ft).
Oil Filter (Cartridge Housing): 25.0 Nm (2.5 kgf-m, 18 lb-ft).
High-Pressure Fuel Pump Mounting Bolts: 9.0-11.0 Nm (0.9-1.1 kgf-m, 7-8 lb-ft).
Flywheel / Drive Plate Bolts: 70.0-80.0 Nm (7.1-8.2 kgf-m, 52-59 lb-ft).
The Mazda LF-VD engine was utilized across Mazda’s
global lineup from 2008 through 2017, primarily in vehicles requiring the
efficiency and torque characteristics of direct injection.
Applications include:
Mazda 3 / Axela: BL series (2009-2013) in select markets, offered with the LF-VD
as a higher-efficiency alternative to the LF-VE.
Mazda 5 / Premacy: CW series (2010-2017) in various global markets, providing
the 2.0-liter direct injection powerplant for the compact multi-purpose vehicle.
Mazda Biante: 2008-2017, a multi-purpose vehicle in the Japanese domestic
market, utilizing the LF-VD to achieve improved fuel economy ratings.
Mazda 6 / Atenza: GH series (2008-2012) in select regions where the 2.0-liter
direct injection engine was offered as a fuel-efficient powertrain option.
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