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MerCruiser 8.1S HO - 420 HP

MerCruiser 8.1S HO

Our latest Multiport injection (MPi) inboard models are now available with optional Digital Throttle and Shift (DTS). DTS eliminates all helm maintenance and provides silky-smooth shifts for the life of the product. DTS automatically synchronizes multiple engines, provides shift protection and provides SmartStart digital starting. DTS also features Transmission Guardian to maximize your time on the water.

Specifications

  • Power 420HP (313 kW)
  • Full Throttle Range 4400-4800 RPM
  • Displacement 496 CiD (8.1L)
  • Engine Type V8
  • Bore & Stroke 4.25" X 4.38" (108mm X 111mm)
  • Compression Ratio 9.1:1
  • Fuel Requirement 87 Octane (R+M)/2
  • Engine Control System PCM 555 with SmartCraft CAN Capability - DTS Optional
  • Fuel Delivery System Gen iii Cool Fuel
  • Fuel injection System Sequential Multi-Point Electronic Fuel injection
  • induction System 2-pieceLong Runner intake with 75mm Throttle Body (80mm w/DTS)
  • ignition System Distributorless ignition w/Knock Control and Platinum Spark Plugs
  • Charging System 65 Amp/917 Watt Alternator
  • Water Drain System Single Point Air-Actuated
  • Exhaust System Long Runner Cast iron Manifolds with 316 Stainless Steel Tubular Dry Joint Elbows
  • Cooling System Closed Cooling, Long Life 5-Year Anti-Freeze, Brass Sea Water Pump
  • Accessory Drive System Serpentine Belt, Stainless Steel Spring Automatic Tensioner
  • Recommended Engine Oil MerCruiser Full Synthetic Engine Oil - SAE 20W-40
  • Engine Guardian System Low Oil Pressure, High Coolant Temperature, High Exhaust Manifold Temperature, Low Sea Water Pressure, Low Voltage, Over-rev control, Knock Control, Transmission Temperature, Low Transmission Fluid Pressure (DTS Only)
  • Velvet Drive 5000A 1.25, 1.5, 2.0, 2.5,2.8:1
  • Velvet Drive 5000V 1.5, 2.0, 2.5:1
  • Velvet Drive 72C Remote V 1.0:1
  • ZF 63A (Available w/DTS) 1.5, 2.0, 2.5,2.7:1
  • ZF 80 A (Available w/DTS) 2.85:1
  • ZF 63 iV (Available w/DTS) 1.5, 2.0, 2.5:1
  • Dimensions (LxWxH) in 47x 33 x 24
  • Dimensions (LxWxH) mm 1194 x 838 x 610
  • Weight w/ Velvet Drive (lbs./kg) 1130/513
  • Digital Throttle and Shift Optional