Suzuki DF115BG Specifications
| Engine Model: Suzuki DF115BG |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.8 cu.in (2 L) |
| Rated Engine Power: 115 Hp (84.6 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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The Suzuki DF115BG is a technologically
advanced 115 Hp outboard that sets a new benchmark in its class by being
the world's first model to offer 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, better acceleration, and enhanced thermal efficiency
compared to the previous DF115A model. Independent tests have confirmed
a 5 to 6 percent improvement in fuel economy across the mid-to-high
speed range.
The engine is packed with features like the Suzuki Lean Burn Control
System, Variable Valve Timing, and a redesigned cowling with an advanced
air intake and silencer for ultra-quiet operation. With its emphasis on
digital integration, smooth power delivery, and ease of maintenance, the
DF115BG is engineered to provide a premium and worry-free boating
experience.
Engine Model: Suzuki DF115BG
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: 84.6 kW (115 Hp)
Full Throttle Operating Range: 5000-6000 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 DF115BG 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 of over 1,000
combinations of port, piston, and masking, 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, standard on this
model, 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 DF115BG'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 DF115BG 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 DF115BG 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. Suzuki recommends an aluminum propeller for single-engine
installations and a stainless steel Watergrip propeller for twin-engine
installations 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): 190 kg (418 lbs)
Dry Weight (Extra Long Shaft - X): 194 kg (427 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.
Engine Oil Filter: Replace every 200 hours or 12 months.
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. Inspect and replace as needed.
Spark Plug Gap: Standard: 0.8-0.9 mm (0.031-0.035 in).
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.
Low Pressure Fuel Filter: Inspect periodically; replace every 2-3 years.
Water Pump Impeller: Inspect every 200 hours or 12 months; replace every
2-3 years.
Anodes (external): Inspect every 100 hours or 12 months; replace when
50% 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. A "Check Thermostat" diagnostic feature
alerts the operator to potential cooling system issues.
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).
The Suzuki DF115BG is an exceptionally versatile outboard, ideally
suited for a wide range of mid-sized boats where a combination of smooth
power, advanced technology, and quiet operation is desired. Fishing
Boats: An excellent primary power source for bay boats, side consoles,
and center consoles, offering precise low-speed control for maneuvering
and trolling.
Pontoon Boats: A popular choice for powering pontoon boats, where its
quiet, fuel-efficient operation and smooth digital controls enhance the
leisurely cruising experience. 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.
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