Mercury MerCruiser
8.1S HO (420-hp)
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Mercury MerCruiser 8.1S HO  (420-hp) Mercury MerCruiser 8.1S HO (420-hp)
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.

Key Features

  • PCM 555 sequential fuel injection and high energy distributorless ignition system ensure reliable starts and outstanding performance, year after year
  • Industry-exclusive 3-year limited corrosion failure warranty
  • Long individual runner intake manifold design provides optimum torque and horsepower for demanding marine applications
  • Exclusive Engine Guardian protection senses potential problems and virtually eliminates the chance for engine damage due to overheating, low oil press
  • Tuned runner exhaust manifold lowers exhaust backpressure for best torque and power
  • Brass sea water pump housing improves life and better resists damage from running dry
  • Sequential fuel and spark control maximizes performance from every engine cylinder
  • Cartridge-type water-separating fuel filter helps protect fuel system and engine against damage
  • ow restriction flame arrestor for added horsepower and torque


Mercury MerCruiser 8.1S HO (420-hp) (Inboard) Specifications
Horsepower 420-hp
Displacement (cu/cc) 496.00 cu / 8,127.98 cc
Number of Cylinders 8 Cylinders
Configuration V8
Fuel Delivery Fuel Injected
Cooling System Closed
Weight (lbs/kg) 1,130.00 lbs / 512.56 kg
Charging System 65 A
Length/width/height 47 in / 33 in / 24 in
Full Throttle RPM 4800

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Mercury MerCruiser 8.1S HO (420-hp)


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