Suzuki DF115A Specifications
| Engine Model: Suzuki DF115A |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 124.7 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 DF115A stands out in the 115 Hp
category due to its Suzuki Lean Burn Control System, a technology that
optimizes the air-fuel mixture for significant fuel economy,
particularly during cruising speeds. This outboard combines the
smoothness and torque of a large-displacement four-cylinder engine with
the efficiency of advanced electronic management.
Its DOHC 16-valve design, self-adjusting timing
chain, and multi-point sequential fuel injection work in concert to
deliver strong acceleration, quiet operation, and ultra-low emissions,
making it a top choice for both freshwater and saltwater applications.
Engine Model: Suzuki DF115A
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 (3.40 in x 3.50 in)
Piston Displacement: 2044 cc (124.7 cu. in)
Maximum Output: 84.6 kW (115 Hp)
Full Throttle Operating Range: 5000-6000 rpm
Idle Speed: Specified in service manual, electronically controlled
Fuel Delivery System: Multi Point Sequential Electronic Fuel Injection
Alternator: 12V 40A
Trim Method: Power Trim and Tilt
Gear Ratio: 2.59:1
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Control System: Remote mechanical; tiller kit optional
Exhaust: Through Prop Hub Exhaust
Propeller Selection: 15" - 26" pitch
Starting System: Electric
Ignition System: Fully-transistorized
Engine Lubrication: Wet sump with trochoid pump
Engine Oil Capacity: 5.5 L (5.8 US qt)
CARB Emissions Rating: 3-Star Ultra-Low
The main component of the DF115A is an in-line four-cylinder block with
a displacement of 2044 cc, designed to deliver high power output and
efficient operation. Topping the block is a high-performance 16-valve,
dual overhead cam (DOHC) powerhead that ensures optimal airflow into the
combustion chambers.
The valve train is driven by a self-adjusting, oil-bathed timing chain
equipped with an automatic hydraulic tensioner, a feature that
eliminates the need for maintenance and ensures precise valve timing
over the life of the engine. This compact architecture contributes to
the motor's excellent power-to-weight ratio and allows for versatile
mounting on a wide variety of boats.
The DF115A's fuel system is highlighted by the Suzuki Lean Burn Control
System. This intelligent technology uses an O2 sensor feedback system to
monitor engine operating conditions in real-time, allowing the engine to
run on a leaner, more efficient fuel mixture during cruising speeds.
This results in improvements in fuel efficiency, with some tests showing
up to 20 percent better economy compared to non-lean burn predecessors.
This advanced system works in conjunction with the Multi-Point
Sequential Electronic Fuel Injection, which precisely meters fuel to
each cylinder for optimal combustion, ensuring smooth starts, immediate
throttle response, and reduced emissions across the entire rpm range.
The DF115A utilizes a wet sump lubrication system, meaning oil is stored
in a pan within the engine. A trochoid oil pump ensures positive
pressure lubrication to all critical components, including the
crankshaft, connecting rods, and valve train.
The system is designed for reliability and simplicity, with a total oil
capacity of 5.5 liters. Regular oil changes, as specified in the owner's
manual, are essential for maintaining engine performance and longevity.
Cooling is managed by a reliable water-cooled system that draws water
from the surrounding environment through an inlet in the gearcase. A
water pump then circulates this water through passages in the cylinder
block and powerhead to dissipate heat.
A key feature for longevity, especially in saltwater environments, is
the Fresh Water Flushing System. This system includes a dedicated flush
port that allows owners to easily connect a garden hose to rinse out
salt, sand, and other debris from the cooling passages after use,
protecting the engine from corrosion and blockages.
| Mid Section and Lower Unit |
The DF115A features an offset driveshaft design that positions the
engine's crankshaft forward of the vertical driveshaft. This
configuration shifts the center of gravity forward, resulting in a more
compact mounting footprint and improved weight distribution on the
boat's transom.
The lower unit houses a robust gearcase with a 2.59:1 gear ratio, which
allows the engine to turn larger propellers for excellent thrust and
hole-shot. The gearcase also includes a speedometer pickup as a standard
feature. Exhaust gases are expelled through the propeller hub,
contributing to quieter operation.
The Power Trim and Tilt system provides hydraulic control over the
outboard's angle, allowing the operator to adjust the boat's attitude
for optimal performance and fuel efficiency while underway.
This system includes a Tilt Limit System, which is a step-free,
continuous type limiter that can be adjusted to prevent the outboard
from tilting too high and making contact with the boat, protecting both
from potential damage. The system also allows for manual tilting in case
of an electrical issue by using a manual release valve.
The DF115A is designed to operate with a wide selection of propellers to
suit various boat types and applications. The recommended propeller
pitch range is from 15 inches to 26 inches.
Selecting the correct propeller is vital for allowing the engine to
operate within its full throttle range of 5000-6000 rpm. A properly
matched propeller ensures maximum performance, fuel efficiency, and
engine longevity, whether the boat is used for cruising, water sports,
or heavy-load activities.
The DF115A is available in two shaft lengths to accommodate different
transom heights. The long shaft model is designed for a standard 20-inch
transom, while the extra-long shaft version is built for a 25-inch
transom.
Transom Height (Long Shaft): 508 mm (20 in)
Transom Height (Extra Long Shaft): 635 mm (25 in)
Dry Weight (Long Shaft): 182 kg (401 lbs)
Dry Weight (Extra Long Shaft): 187 kg (412 lbs)
Mounting: Shear mount engine mounting system
Engine Oil Capacity: 5.5 L (5.8 US qt).
Gearcase Oil Capacity: Information available in service manual.
Spark Plug: NGK DCPR7E (or equivalent, as per service manual).
Spark Plug Gap: 0.8-0.9 mm (0.031-0.035 in).
Valve Clearance (Intake): 0.23-0.33 mm (0.009-0.013 in) cold (consult
service manual).
Valve Clearance (Exhaust): 0.33-0.43 mm (0.013-0.017 in) cold (consult
service manual).
Maintenance Features: The self-adjusting timing chain requires no
routine maintenance. The Fresh Water Flushing System simplifies post-use
cleanup. A low oil pressure caution system alerts the operator to
potential lubrication 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 DF115A is a versatile powerplant suitable for a broad
spectrum of boat types. Its combination of light weight, ample power,
and exceptional fuel efficiency makes it a preferred choice for many
applications. Fishing Boats: Ideal for center consoles, bay boats, and
bass boats in the 17 to 20-foot range, offering the reliability and
low-end torque needed for fishing. Dual Console and Bowrider Boats:
Provides quiet and efficient power for family runabouts used for
cruising and water sports.
Pontoon Boats: A popular choice for powering pontoons, where its strong
torque and fuel economy enhance the leisurely cruising experience.
Lightweight Cruisers: Suitable for small cabin cruisers and deck boats
where a balance of power and weight is essential. Saltwater Use:
Equipped with Suzuki's multi-layer anti-corrosion finish and Sacrificial
Anodes, it is engineered to withstand the harsh saltwater environment,
ensuring long-term durability.
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