Suzuki DF115B Specifications
| Engine Model: Suzuki DF115B |
| 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 DF115B is a refined and
technologically advanced 115 Hp outboard that delivers a compelling
combination of performance, efficiency, and user-friendly features. The
increase in the compression ratio to 10.6:1 is a key advancement,
contributing to improved top speed, quicker 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
resonator for ultra-quiet operation. With its emphasis on reliability,
ease of maintenance, and a host of thoughtful design details, the
DF115BG is engineered to provide a premium and worry-free boating
experience.
Engine Model: Suzuki DF115B
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
Steering: Remote
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Control System: Mechanical (Digital Precision Control also available on
specific model variants)
Propeller Selection: 15"-25" (Standard Rotation); 17"-23" (Counter
Rotation)
Starting System: Electric with Suzuki Keyless Start System (on select
models)
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.)
Spark Plug: NGK LKR6E
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)
Valve clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 91 (Research method)
Compression Ratio: 10.6:1
The DF115B is built upon a robust inline four-cylinder block with a
displacement of 2045 cc. 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.
0The DF115B'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.
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 redesigned cowling
incorporates a new air intake structure with improved water separation.
The DF115B employs a camshaft-driven trochoid pump pressure lubrication
system to ensure consistent, pressurized oil delivery to all critical
engine components. Oil from the oil pan is drawn through a strainer and
passed through a spin-on type oil filter before entering the main oil
gallery.
A pressure regulator (relief valve) is positioned between the oil pump
and oil filter to maintain constant oil pressure. The engine has an oil
capacity of 5.5 liters. A new oil spill catcher on the filter mount is a
key maintenance-focused design improvement, preventing spillages during
oil changes.
Engine temperature is managed by a reliable water-cooled system. The
system includes the lower unit water pump, a water supply tube, an oil
pan water pressure valve, power unit water passages, and a thermostat.
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 to cool both the power unit and exhaust. If
overheating occurs, components of the cooling system, such as the
impeller, water tube, and thermostat, must be inspected for blockage,
corrosion, or damage.
For post-operation maintenance, the Dual Engine Flush Port 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, one of the largest
in its class, 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 torque for quick acceleration and
great top-end speed. Exhaust gases are channeled through the propeller
hub for quieter operation. A new silencer and resonator system
integrated into the design further reduces engine noise at all speeds.
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 features a
user-adjustable tilt limit switch that 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 DF115B 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): 188-190 kg (414-418 lbs)
Dry Weight (Extra Long Shaft - X): 192-194 kg (423-428 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 periodically.
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
periodically.
Valve Clearance (Exhaust): 0.33-0.37 mm (0.013-0.015 in) (cold); inspect
periodically.
Water Pump Impeller: Inspect and replace as needed.
Anodes (external): Inspect periodically; replace when eroded.
Propeller Nut and Cotter Pin: Inspect and replace cotter pin as needed.
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, designed for freshwater, inshore, and
offshore fishing applications. Its performance on a Marshall M4 6.65m
rigid inflatable boat demonstrated excellent handling and a relatively
low noise impact at full throttle, with a recorded top speed of 33 knots
at 5900 rpm. Pontoon Boats: A popular choice for powering pontoon boats,
where its quiet, fuel-efficient operation enhances 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. Commercial and Work Applications: Its robust construction,
fuel efficiency, and advanced reliability make it a dependable choice
for various light-duty commercial applications, a testament to its
durability as it is used by professional operators like Sea Start and
Solent RIB Charter.
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