360 APX

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.

Photo of 360 APX

MODEL DETAILS

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
FULL SPECS
Brochure VIDEO
  • 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
  • Bore & Stroke (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
  • Oil Capacity (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

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High Performance Marine Engines