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 - 750MAX 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
