The Mercury Racing 360 APX is a potent competition outboard designed specifically to power Formula 1 tunnel boats in the premier class of the UIM F1H2O World Championship. The 360 APX is tuned to deliver amazing torque from a durable, low-emissions four-stroke V8 powerhead that sets a new benchmark for circuit-racing performance.

A 4.6-liter V8 powerhead is naturally aspirated and features deep-breathing dual overhead cam/four-valve architecture with a short-runner intake manifold mated to a cold-air induction system. An 11:1 compression ratio boosts torque output while the 7000 RPM redline extends the power curve. A dynamic oil pickup system is designed to maintain critical engine oil pressure under high-G loads. A cut-down flywheel, deleted balance shaft and carbon fiber top cowl optimize weight.

To align with the sustainability initiatives of the UIM and F1H2O organizations, this engine offers 90% lower exhaust emissions than current two-stroke racing engines.

SPECIFICATIONS:

RATED HORSEPOWER (HP/KW) - 360 / 268
MEASURED PROPSHAFT HORSEPOWER - 360
IDLE RPM - 750
MAX RPM AT FULL THROTTLE - 7000
CYLINDERS/ENGINE CONFIGURATION - V8 [64 Degree] With Racing-Specific Dual Overhead Cam [DOHC] And 32-Valves
DISPLACEMENT (CC) - 4573
DISPLACEMENT (CUBIC INCH, CID) - 279
BORE & STROKE -  (MM)92 X 86 / (IN.) 3.62 X 3.39
INDUCTION SYSTEM - Short-Runner Intake Manifold With Forced Cold Air Induction
MIDSECTION DESIGN - Circuit Racing Specific 12" Mid Section Direct Mounted With Integral Trim And Lift
FUEL SYSTEM - Electronic Fuel Injection (EFI) Computer Controlled With O2 And Pressure Feedback
FUEL REQUIREMENTS - Unleaded Premium 91 Octane Minimum (R+M/2) Or 98 RON 10% Ethanol Maximum
IGNITION SYSTEM - SmartCraft PCM 112 Digital Inductive
CHARGING SYSTEM - 85-Amp (1071 Watt)
STARTING - 24V Electric Start With SmartStart Protection
EXHAUST SYSTEM - Above Water
COOLING SYSTEM - Water-Cooled With Thermostat Control And Integrated Pressure Relief
LUBRICATION SYSTEM - Structural Wet Sump With Integrated Baffle System And Oil Cooler
OIL REQUIREMENT - Mercury Racing High-Performance Synthetic SAE 10W-30
OIL CAPACITY - (QTS)7 / (L)6.6
ENGINE MANAGEMENT SYSTEM - Competition Spec SmartCraft PCM 112
THROTTLE AND SHIFT CONTROLS - Digital Throttle
ENGINE PROTECTION SYSTEM - SmartCraft Engine Guardian With Competition Calibration
TRIM/TILT SYSTEM - Power Trim And Lift With Remote Pumps
TILT RANGE - NA
TRIM RANGE - 13°
LIFT RANGE - 26 Mm [1 In]
TROLL CONTROL - NA
GEARCASE - OB IV SSM
GEARCASE RATIO - 1.13 (15:17)
OVERDRIVE RATIO - 0.714 (35:25) | 0.739 (23:17)
OVERALL DRIVE RATIO - 0.809 | 0.837
GEAR SHIFT - NA
DRY WEIGHT (LBS./KG)* - 430 Lbs / 195 Kgs
*Dry Weight Refers To Base Engine Without Liquids, Battery Cables, Throttle/Shift Cables, Bolt-On Steering Components, Mounting Hardware, Or Propeller/Hub Kits.
STEERING ANGLE - +/- 30 Degrees
STEERING - Cable With Wing Plates
EMISSIONS LEVEL - CARB/EPA 3-Star, EU RCD II