Suzuki DF150AP Specifications
| Engine Model: Suzuki DF150AP |
| Engine Type: 4-stroke inline 4-cylinder DOHC 16-valve gasoline outboard engine |
| Total Displacement: 175 cu.in (2.9 L) |
| Rated Engine Power: 150 Hp (110.3 kW) at 5500 rpm |
| Fuel System: Multi point sequential electronic fuel injection |
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The Suzuki DF150AP is a technologically
advanced 150 Hp outboard that sets a high standard in its class. It is
built around a large-displacement inline four-cylinder powerhead with a
2,867 cc displacement and a high 10.2:1 compression ratio, one of the
largest and most powerful in its class, delivering impressive
acceleration and low-end torque. The powerhead features a DOHC 16-valve
design with a maintenance-free self-adjusting timing chain.
The integration of the Suzuki Lean Burn Control System, utilizing an O2
sensor feedback loop, optimizes the air-fuel mixture for significant
fuel savings, particularly during cruising speeds, without sacrificing
throttle response or overall power delivery. A secondary balancer system
effectively counters inherent inline four-cylinder vibrations for
exceptionally smooth operation across the entire rpm range.
With features like Suzuki Precision Control drive-by-wire, Variable
Valve Timing (VVT), and an available Selective Rotation lower unit for
perfect twin-engine setups, the DF150AP is engineered to satisfy the
demands of serious boaters seeking a reliable, efficient, and
high-performing outboard.
Engine Model: Suzuki DF150AP
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: 97.0 mm x 97.0 mm (3.81 in x 3.81 in)
Piston Displacement: 2867 cc (175 cu. in)
Maximum Output: 110.3 kW (150 Hp)
Full Throttle Operating Range: 5000-6000 rpm
Idle Speed: 600-700 rpm
Fuel Delivery System: Multi-Point Sequential Electronic Fuel Injection
with Lean Burn Control
Alternator: 12V 44A
Trim Method: Power Trim and Tilt
Gear Ratio: 2.50:1
Gear Shift: F-N-R (Forward-Neutral-Reverse)
Control System: Suzuki Precision Control (Digital Drive-by-Wire)
Exhaust: Through Prop Hub Exhaust
Propeller Selection: 15"-27.5" (Standard Rotation); 17"-26" (Counter
Rotation)
Starting System: Electric
Ignition System: Fully-transistorized
Engine Lubrication: Trochoid pump pressure lubrication
Engine Oil Capacity: 8.0 L (8.5/7.0 US/Imp. qt.)
Fuel Type: Alcohol-free unleaded gasoline
Minimum Fuel Octane Rating: 87 (Research method)
Compression Ratio: 10.2:1
The DF150AP is built upon a robust inline four-cylinder block with a
large displacement of 2,867 cc, which the development team based on a
"big block" philosophy to deliver exceptional acceleration and velocity.
This substantial displacement is combined with a high compression ratio
of 10.2:1, drawing on Suzuki's extensive motorsports experience to
obtain great performance from a compact engine. The block is topped with
a DOHC powerhead that provides four valves per cylinder for optimal
airflow and combustion efficiency.
A key feature is the maintenance-free, self-adjusting oil-bathed timing
chain with an automatic hydraulic tensioner, ensuring precise valve
timing over the engine's life without requiring periodic adjustments.
The Variable Valve Timing (VVT) system, hydraulically controlled by oil
pressure, optimizes intake valve timing to maximize torque in the low
and mid-range, delivering powerful acceleration across the entire
powerband.
To neutralize the secondary vibration inherent to high-rpm operation in
inline four-cylinder engines, Suzuki engineers utilize a counter
balancer system. This system is divided into left and right sections,
each rotating in an opposite direction at twice the speed of the
crankshaft, effectively countering vibrations and producing remarkably
smooth engine operation.
The offset driveshaft design, pioneered by Suzuki, positions the
crankshaft in front of the driveshaft, moving the outboard's center of
gravity forward. This contributes greatly to the outboard's overall
compactness and improved weight distribution on the boat's transom,
while also reducing vibration by moving the engine's axis of inertia up
over the upper engine mount. A combination of soft-type and high-thrust
rubber mounts on both upper and lower mounts further reduces vibration
and provides stable operation under high loads.
The DF150AP's fuel system is highlighted by the Suzuki Lean Burn Control
System. This intelligent fuel delivery technology uses a 32-bit onboard
Engine Control Module (ECM) and an O2 sensor feedback loop to monitor
engine performance and operating conditions in real-time.
It predicts fuel needs and delivers a leaner, more precise fuel mixture
across the outboard's operating range, resulting in significant
improvements in fuel economy, especially in the cruising range where the
engine is used most of the time.
When combined with Suzuki Precision Control, it allows control of fuel
and air flow to boost the limit of the controllable revolution range,
further improving fuel economy over a wide operating range.
The Multi-Point Sequential Electronic Fuel Injection system precisely
meters fuel to each cylinder for optimal combustion. A Knock Sensor
monitors combustion to provide the ECM with information needed for
precise management of engine timing for optimum performance, maximizing
power output while also helping to increase engine durability.
The O2 Sensor Feedback Control system provides accurate, real-time
information that the ECU uses to manage the fuel/air ratio as operating
conditions change, helping to maintain optimum engine operating
efficiency across the engine's full operating range.
The DF150AP 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 a substantial oil capacity
of 8.0 liters.
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.
For post-operation maintenance, the Fresh Water Flushing System allows
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 alerts the operator with both visual
and audio warnings if water is present in the fuel, preventing issues
like poor combustion, power loss, and corrosion.
| Mid Section and Lower Unit |
The mid-section houses the offset driveshaft, which contributes to the
engine's forward center of gravity and compact mounting footprint. The
lower unit features a robust gearcase designed for the innovative Suzuki
Selective Rotation system.
This world-first technology incorporates a special, unified design of
gears, shafts, and bearings that allow the outboard to operate reliably
and efficiently in either standard or counter-rotation direction. For
boats equipped with twin outboards, this eliminates the need to purchase
a dedicated counter-rotation model; the DF150AP can be switched to
counter-rotation mode by changing the gearshift mode and installing a
counter-rotation propeller.
The lower unit utilizes a two-stage gear reduction system designed to
take maximum advantage of the power produced by the high-performance
engine. Providing a final drive ratio of 2.50:1, one of the largest in
its class, it delivers powerful torque for quick acceleration and great
top-end speed.
The Multi-Stage Induction system ensures the engine gets the right
amount of air by utilizing two intake manifold pipes per cylinder, with
longer curved pipes for low-end torque and shorter direct pipes for
high-rpm power. Exhaust gases are channeled through the propeller hub
for quieter operation, and an intake resonator reduces air intake noise.
The Power Trim and Tilt (PTT) system provides hydraulic control over the
outboard's angle, allowing the operator to adjust boat trim for optimal
performance, fuel efficiency, and ride comfort. The system is designed
with a manual release valve that allows the engine to be raised or
lowered manually in case of electrical system failure. An impact relief
valve is incorporated as a safety feature to protect the gearcase and
prevent internal PTT pressure build-up in the event of an underwater
impact.
The Tilt Limit System prevents the outboard from tilting beyond a
selected angle. When the motor is tilted beyond the maximum trim
position, the swivel bracket loses side support from the clamp bracket,
and operation above 1500 r/min should be avoided to prevent damage and
potential occupant injury. Proper trim angle adjustment is critical for
maintaining steering stability; too small an angle may cause the boat to
"plow," while too large an angle may cause "chine walk" or "porpoise,"
resulting in loss of steering control.
The DF150AP is designed to work with a range of high-performance
stainless steel propellers to match various boat types and load
conditions. The recommended propeller pitch selection ranges from 15
inches to 27.5 inches for standard rotation models, and from 17 inches
to 26 inches for counter-rotation applications.
All propellers are of the three-blade type. The Watergrip Propeller,
featuring a new interchangeable square-shaped bush, offers efficient
conversion of engine power to propulsion resulting in better grip and
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): 236 kg (520 lbs)
Dry Weight (Extra Long Shaft - X): 241 kg (530 lbs)
Engine Mounting: Shear Mount system
Initial Service: Perform at 20 hours or 1 month.
Engine Oil and Filter: Replace every 100 hours or 12 months.
Gear Oil: Replace every 100 hours or 12 months.
Spark Plugs Type: NGK LKR6E.
Spark Plugs Inspect: Every 100 hours or 12 months
Spark Plugs Replace: Every 300 hours or 36 months.
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): 0.30-0.34 mm (0.012-0.013 in) (cold)
Low Pressure Fuel Filter: Replace every 100 hours or 12 months.
Engine Oil Filter: Replace every 200 hours or 12 months.
High Pressure Fuel Filter: Replace every 400 hours or 2 years.
Water Pump Impeller: Replace every 1000 hours.
Balancer Chain: Inspect every 300 hours or 36 months.
Valve Lash: Inspect every 300 hours or 36 months.
Anodes (external): Inspect every 100 hours or 12 months.
Lubrication Points: Inject approximately 10 grams of marine-grade
water-resistant grease into the engine holder grease nipple at the
initial 20 hours, then approximately 5 grams at every 100 hours (12
months). Do not use powered grease guns as they may damage the oil seal.
Maintenance Features: The self-adjusting timing chain is
maintenance-free, running in an oil bath with automatic hydraulic
tensioner ensuring proper adjustment at all times. The Suzuki Water
Detecting System alerts the operator when water is present in the fuel.
Freshwater flush ports simplify cooling system cleaning.
Fishing Boats: An ideal primary power source for bay boats, center
consoles, and bass boats in the 18 to 22-foot range, offering the
reliability, low-end grunt, and optional counter-rotation capability for
perfect twin-engine setups. Pontoon Boats: A popular choice for powering
pontoon boats, where its strong torque provides excellent acceleration
and efficient cruising for leisurely days on the water with family and
friends.
Dual Console and Bowrider Boats: Provides quiet, clean, 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 fuel economy is
essential.
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