Suzuki DF140BG Specifications
| Engine Model: Suzuki DF140BG |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.8 cu.in (2 L) |
| Rated Engine Power: 140 Hp (103 kW) at 6000 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
____________________________________________________________________________________
The Suzuki DF140BG is a technologically
advanced 140 Hp outboard that sets a new benchmark in its class by
offering drive-by-wire throttle and shift controls, known as Suzuki
Precision Control. This system replaces traditional mechanical cables
with electrical signals, resulting in smoother, more precise shifting
and throttle response, particularly at low speeds when maneuvering.
Built around a 2,045 cc inline four-cylinder powerhead, the engine
features a raised compression ratio of 10.6:1, which contributes to
improved top speed, quicker acceleration, and enhanced thermal
efficiency.
Users report being "absolutely blown away with the performance and
torque," noting it "really punches out of the hole well". The engine is
packed with features like the Suzuki Lean Burn Control System, Variable
Valve Timing, and a redesigned cowling for ultra-quiet operation. With
its emphasis on digital integration, smooth power delivery, and ease of
maintenance, the DF140BG is engineered to provide a premium and
worry-free boating experience.
Engine Model: Suzuki DF140BG
Engine Type: 4-Stroke, DOHC (Double Overhead Camshaft), 16-Valve
Number of Cylinders: In-Line 4
Valve Train Drive: Self-adjusting oil-bathed timing chain
Bore and Stroke: 86.0 mm x 88.0 mm (3.39 in x 3.46 in)
Piston Displacement: 2045 cc (124.8 cu. in)
Maximum Output: 103 kW (140 Hp)
Full Throttle Operating Range: 5700-6300 rpm
Fuel Delivery System: Multi-Point Sequential Electronic Fuel Injection
Alternator: 12V 40A (20A at 700rpm, 40A at 6000rpm)
Steering: Remote
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1
Gear Shift: F-N-R (Forward-Neutral-Reverse) via Suzuki Precision Control
(Drive-by-Wire)
Control System: Suzuki Precision Control (Digital)
Propeller Selection: 15"-25" (Standard Rotation); 17"-23" (Counter
Rotation)
Starting System: Electric with Suzuki Keyless Start System
Ignition System: Fully-transistorized
Engine Lubrication: Trochoid pump pressure lubrication
Engine Oil Capacity: 5.5 L (5.8/4.8 US/Imp. qt.)
Gear Oil Capacity: 1.05 L (1.11/0.92 US/Imp. qt.)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 91 (Research method)
Compression Ratio: 10.6:1
The DF140BG is built upon a robust inline four-cylinder block with a
displacement of 2045 cc, a proven and refined powerplant. A key
advancement for this model is the increase in the compression ratio to
10.6:1. Through extensive simulation and testing, engineers achieved
this higher ratio, which is a primary contributor to the engine's
improved top speed, quicker acceleration, and greater thermal
efficiency.
The powerhead features a DOHC 16-valve configuration for optimal airflow
and combustion efficiency. The valve train is driven by a self-adjusting
oil-bathed timing chain, which runs in an oil bath and is equipped with
an automatic hydraulic tensioner. This design renders the timing chain
maintenance-free for the life of the engine. The Variable Valve Timing
(VVT) system is hydraulically controlled by oil pressure and
automatically optimizes intake valve timing to deliver strong, smooth
torque and impressive acceleration across the entire powerband.
The offset driveshaft design positions the powerhead closer to the
front, moving the outboard's center of gravity forward. This
configuration results in reduced vibration, a more compact mounting
footprint, and more stable steering performance.
The DF140BG's fuel system is centered around the Suzuki Lean Burn
Control System. This intelligent technology uses an O2 sensor feedback
loop to monitor engine operating conditions in real-time, predicting
fuel needs and delivering a precise, optimized air-fuel mixture. This
system provides significant improvements in fuel economy across all
speed ranges, most notably at cruising speeds, and works in perfect
harmony with the electronic Suzuki Precision Control system to enhance
efficiency over a wide operating range.
The Multi-Point Sequential Electronic Fuel Injection system precisely
meters fuel to each cylinder for optimal combustion, ensuring crisp
throttle response, smooth acceleration, and reduced emissions. The
engine management system also incorporates a knock sensor to monitor
combustion, allowing the ECU to adjust timing for optimum performance
and to help increase engine durability.
The DF140BG employs a trochoid pump pressure lubrication system to
ensure consistent, pressurized oil delivery to all critical engine
components, including the crankshaft, connecting rods, and the valve
train with its VVT components.
The engine has an oil capacity of 5.5 liters. A new oil filter location
and the addition of an oil collector tray around the filter are key
maintenance-focused design improvements, allowing for cleaner and easier
oil changes by simply removing the top cowling.
Engine temperature is managed by a reliable water-cooled system. A water
pump, located in the lower unit, draws water from the surrounding
environment and circulates it through water jackets in the cylinder
block and powerhead. The cooling system benefits from a dual water inlet
design. By positioning water intakes at two locations, the system
ensures a greater water supply at high speeds while also allowing for
effective operation in shallow water conditions, protecting the engine
from overheating.
For post-operation maintenance, the Fresh Water Flushing System allows
for easy connection of a garden hose to rinse salt, sand, and other
debris from the cooling passages, protecting the engine from corrosion.
The Suzuki Water Detecting System utilizes a water-detecting fuel filter
to alert the operator with both visual and audio warnings if water is
present in the fuel, thereby preventing issues like poor combustion,
power loss, and internal corrosion.
| Mid Section and Lower Unit |
The mid-section houses the offset driveshaft, contributing to the
forward center of gravity and overall compactness. The lower unit
features a robust gearcase with a 2.59:1 gear ratio, achieved through a
2-stage gear reduction system.
This system, enabled by the offset driveshaft, provides a first stage
reduction between the crankshaft and driveshaft and a second stage
reduction inside the gear case. The higher gear ratio allows the engine
to turn larger diameter propellers, resulting in powerful acceleration,
high propulsive efficiency, and the ability to maintain thrust even
under heavy loads.
Suzuki engineers also improved the gearbox durability by optimizing the
oil flow path within the gearcase. The rotating pinion gear now creates
negative pressure that promotes better oil circulation, which lowers the
gear oil temperature and extends the durability of the pinion gear.
Exhaust gases are channeled through the propeller hub for quieter
operation.
The Power Trim and Tilt (PTT) system provides hydraulic control over the
outboard's angle, allowing the operator to adjust the boat's trim for
optimal performance, fuel efficiency, and ride comfort.
The system includes a Tilt Limit System, which prevents the outboard
from tilting beyond a predetermined angle, thereby protecting both the
engine and the boat from damage that can be caused by excessive tilting.
The DF140BG is designed to work with a range of propellers to match
various boat types and load conditions. The recommended propeller pitch
selection ranges from 15 inches to 25 inches for standard rotation
models, and from 17 inches to 23 inches for counter-rotation
applications.
All propellers are of the three-blade type. For high-performance
applications, such as the twin-engine Infanta 7.5m RIB, stainless steel
Watergrip propellers are recommended to optimize performance.
Transom Height (Long Shaft - L): 508 mm (20 in)
Transom Height (Extra Long Shaft - X): 635 mm (25 in)
Dry Weight (Long Shaft - L): 188 kg (414 lbs)
Dry Weight (Extra Long Shaft - X): 192 kg (423 lbs)
Engine Mounting: Shear Mount system
Initial Service: Perform at 20 hours or 1 month.
Engine Oil: Replace every 100 hours or 12 months.
Engine Oil Capacity: 5.5 L with filter.
Recommended Engine Oil: High-quality 4-stroke motor oil, NMMA FC-W
certified.
Gear Oil: Replace every 100 hours or 12 months.
Gear Oil Capacity: 1.05 L.
Spark Plugs: NGK LKR6E.
Spark Plug Gap: Standard: 0.8-0.9 mm (0.031-0.035 in).
Spark Plug Torque: 15-19 Nm (11-14 lb-ft).
Valve Clearance (Intake): 0.23-0.27 mm (0.009-0.011 in) (cold); inspect
every 300 hours or 36 months.
Valve Clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold); inspect
every 300 hours or 36 months.
Water Pump Impeller: Inspect periodically; replace as needed.
Anodes (external): Inspect periodically; replace when eroded.
Propeller Nut and Cotter Pin: Inspect and replace cotter pin as needed.
Maintenance Features: The self-adjusting timing chain is
maintenance-free. The easy-access oil filter and oil collector tray
simplify oil changes. The Suzuki Water Detecting System provides an
alert for water in the fuel.
Connecting Rod Nuts: 16-18 Nm (12-13 lb-ft).
Crankshaft Bearing Cap Bolt: 50-55 Nm (37-41 lb-ft).
Flywheel Nut: 130-140 Nm (96-103 lb-ft).
Spark Plugs: 20-25 Nm (15-18 lb-ft).
Oil Drain Plug (Engine): 23-27 Nm (17-20 lb-ft).
Gearcase Oil Drain/Fill Screws: 7-10 Nm (5-7 lb-ft).
Propeller Nut: 35-55 Nm (26-41 lb-ft).
Power Trim and Tilt Motor Assembly Bolts: 23-27 Nm (17-20 lb-ft).
Fishing Boats: An excellent primary power source for bay boats, side
consoles, and center consoles, offering precise low-speed control for
maneuvering and trolling. It performs exceptionally well in twin-engine
configurations on larger rigs, such as the Swift 7.6m Centre Console.
Rigid Inflatable Boats (RIBs): Powers high-performance RIBs such as the
Infanta 7.5 LRi, where twin DF140BG engines deliver a top speed of 83
km/h with smooth and efficient performance.
Dual Console and Bowrider Boats: Provides refined and efficient power
for family runabouts used for cruising, tubing, and water sports.
Lightweight Cruisers and Deck Boats: Suitable for smaller cabin cruisers
and deck boats where a balance of power, weight, and advanced features
is essential.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
