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The Racer's Edge

The Mercury Racing 250 APX joins the competition portfolio to open a new competitive era in APBA Formula 1 powerboat racing. Rated at more than 250hp, the 4.6L V8 250 APX is tuned to deliver race-winning torque and acceleration combined with outstanding durability and a cost-effective, race-winning advantage over legacy 2-strokes.

12-Inch Midsection

The 12-inch midsection is designed specifically for Formula 1 tunnel boat applications, with a structural wet sump driveshaft housing and integrated power trim and lift with remote pumps.

200Apx Overdrive
Gearcase

Overdrive

An overdrive spur gearset between the crankshaft and the gearcase increases the input shaft speed to the gearcase and produces the left-hand propeller rotation desired for Formula 1 circuit racing.

SSM Gearcase

An evolved Mercury Racing Super Speed Master (IV SSM) outboard gearcase is direct-drive with no neutral or reverse shifting.

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A Winning Formula

The 250 APX derives from the Mercury Racing 300R and shares features with the 360 APX competition engine, including the induction system, midsection and overdrive spur gearset. Digital control offers smooth and precise throttle application. The 250 APX uses an evolved version of the Mercury Racing Super Speed Master (IV SSM) outboard gearcase. The top cowl and driveshaft housing covers are lightweight carbon-fiber composite with a robust quick release latching and sealing system ease access to the midsection.

250APX boat
200APX Fixed
200APX V2
specs background
View Full Specifications

Facts & Figures

Full Throttle RPM

6800

Rate hp

250

Cylinders

V8

Displacement

4.6L

Product details

IDLE RPM 750
MAX TRIM RANGE 13°
MAX TILT RANGE N/A
LIFT RANGE (MM) 26
COOLING SYSTEM Water-Cooled With Thermostat Control And Integrated Pressure Relief
ENGINE MANAGEMENT SYSTEM Competition Spec SmartCraft PCM 112
ENGINE PROTECTION SYSTEM SmartCraft Engine Guardian With Competition Calibration
EXHAUST SYSTEM Above Water
LUBRICATION SYSTEM Structural Wet Sump With Integrated Baffle System and Air Cooler
OIL CAPACITY 6.6 L
STEERING ANGLE + / - 30°
GEAR SHIFT N/A
OVERDRIVE RATIO 0.818 (18:18)
OVERALL DRIVE RATIO 0.927
TRIM/TILT SYSTEM Power Trim and Lift with Remote Pumps
MID SECTION Circuit Racing Specific 12" Mid Section Direct Mounted with Integral Trim and Lift
BORE AND STROKE 92 x 86 (mm) / 3.62 x3.39 (in)
INDUCTION SYSTEM Short-Runner Intake Manifold with Forced Cold Air Induction
FUEL REQUIREMENTS Unleaded mid-grade 89 Octane Minimum (R+M/2) or 98 RON 10% Ethanol Maximum
FUEL SYSTEM Electronic Fuel Injection (EFI) Computer Controlled with O2 and Pressure Feedback
IGNITION SYSTEM SmartCraft PCM 112 Digital Inductive
CHARGING SYSTEM 85-amp (1071 Watt)
STARTING 24V Electric Start with SmartStart Protection
OIL REQUIREMENT MRX10W-30 Full Synthetic
GEARCASE RATIO 1:13 (15:17)
GEARCASE OB IV SSM
DRY WEIGHT 436 lbs / 198 kgs
EMISSIONS LEVEL N/A
THROTTLE AND SHIFT Digital Throttle
STEERING Cable with Wing Plates
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