Specifications

Mercury® Remanufacturing: Plus-Series Bravo Sterndrives

 496 H.O. Bravo
Part number
  • 8M0089472
HP / kW @ flywheel
  • 425 / 317
Maximum RPM (WOT)
  • 4600 - 5000
Engine type
  • Remanufactured 8.1L Mercury V-8 iron block and heads
Displacement (CID/L)
  • 496 / 8.1
Bore and stroke
  • 4.25 x 4.38" / 108 / 111 mm
Compression ratio
  • 9.1:1 with hypereutectic pistons
Fuel requirement
  • 87 octane (R+M)/2
Engine control system
  • PCM 555
Fuel delivery system
  • GEN III cool fuel
Fuel injection system / carburetor type
  • Sequential multi-point electronic fuel injection (MPI)
Air induction
  • Two-piece long runner intake with 75 mm throttle body (80 mm w/DTS)
Ignition
  • Distributorless ignition with knock control and platinum spark plugs
Alternator amp / Watt
  • 65 amp / 917 watt
Water drain system
  • Single point air actuated
Exhaust system
  • Iron manifolds with 4" / 102 mm diameter 316 stainless steel dry joint exhaust elbows
Cooling system
  • Brass sea water pump
  • Closed cooling
  • Long life 5-year antifreeze
Accessory drive system
  • Serpentine belt
Lubrication system
  • High flow oil pump and copper engine oil cooler
Recommended oil
  • Mercury MerCruiser Synthetic Blend 25W-40, NMMA FC-W rated
Engine guardian system
  • Exhaust manifold temperature
  • High coolant temperature
  • Knock control
  • Low drive lubricant
  • Low oil pressure
  • Low voltage
  • Low water pressure
  • Over-rev
Rocker arms
  • 1.7:1 stamped steel
Dimensions (L x W x H)
  • 35 x 33 x 24" / 888 x 840 x 603 mm
Weight (engine only)
  • 1131 lbs / 513 kg
Compatible drives (application dependent - contact sales or service)
  • Bravo One X 1.50:1
  • Bravo One XR 1.50:1
  • Bravo One XZ 1.50:1
  • Bravo Three XR 1.81:1
  • Bravo Three XR 2.00:1
  • Bravo Two X 1.81:1

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https://www.mercurymarine.com/en/us/engines/inboard-and-sterndrive/remanufacturing/plus-series-bravo-sterndrives/496-ho-bravo