MerCruiser 4.5L 250HP

The Next Generation

Featuring a host of engineering innovations, the 4.5L series establishes new standards for power-to-weight ratio, driver experience, acceleration, durability, and ease of maintenance.

Engine Details

HP / kW
  • 250 / 184
Maximum RPM (WOT)
  • 4800-5200
Engine type
  • V6, 2-valve/cylinder pushrod
Displacement (L)
  • 4.5
Bore and stroke
  • 4.0 x 3.6" / 102 x 92 mm
Fuel requirement
  • 90 RON 10% Ethanol Maximum
  • Unleaded Regular 87 Octane Minimum (R+M/2)
Fuel delivery system
  • Computer controlled Multi-Port Electronic Fuel Injection (MPI)
Air induction
  • Performance-Tuned Scroll Intake Manifold
Ignition
  • SmartCraft PCM 112 Digital Inductive
Alternator amp / Watt
  • 70 amp / 882 watt (Belt-Driven)
Water drain system
  • Air Actuated "Season Extender" (Bravo)
  • Easy Drain "Season Extender" (Alpha)
Exhaust system
  • Through prop
Cooling system
  • Water cooled with thermostat; FWC available as factory option (Alpha) and packaged with SeaCore Drive (Bravo)
Lubrication system
  • Integrated wet sump
Recommended oil
  • NMMA Certified FCW 25W-40 Synthetic Blend
Dimensions (L x W x H)
  • 696 x 740 x 559 mm
Weight (engine only)
  • 343 kg
Compatible drives
  • Alpha
  • Bravo One
  • Bravo Three
  • Bravo Two