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.
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.
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.
An evolved Mercury Racing Super Speed Master (IV SSM) outboard gearcase is direct-drive with no neutral or reverse shifting.
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.
Full Throttle RMP
6800
Rate hp
250
Cylinders
V8
Displacement
4.6L
Downloads
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Product details |
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|---|---|
| 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 |
