MerCruiser 350 MPI Alpha / Bravo 300 PS (8M0188295)

High-Performance 5.7L Marine Engine | Precision Power by JB Marine GmbH

Experience marine performance at its best with the MerCruiser 350 MPI Alpha / Bravo 300 PS, a proven and powerful 5.7-liter inboard engine from Mercury Marine. Built for exceptional reliability, fuel efficiency, and smooth acceleration, this model is the gold standard for boat owners upgrading their inboard propulsion systems.

Whether you’re repowering an older sterndrive boat or seeking a new MerCruiser motor for sale, the 350 MPI delivers 300 horsepower of refined marine engineering designed for both pleasure craft and commercial applications.

Power, Efficiency & Reliability in One Engine

The MerCruiser 350 MPI 300 PS features Multi-Port Fuel Injection (MPI) technology, delivering precise fuel management and instant throttle response. Its durable construction, including Vortec cast-iron cylinder heads and a nodular iron crankshaft, ensures long-lasting performance in all conditions, from freshwater cruising to heavy-duty saltwater operation.

Performance Highlights

• 300 PS / 300 HP output at 5000 RPM

• 5.7 L (350 cu in) V-8 configuration for robust midrange torque

• Multi-Port Fuel Injection (MPI) for efficient combustion and smooth response

• SmartCraft compatibility for real-time digital monitoring and diagnostics

• ECM 555 with Engine Guardian for automatic engine protection

• Vortec cast-iron heads & stainless-steel valves for superior durability

• DTS (Digital Throttle & Shift) ready for modern digital control

This engine is a perfect combination of raw power and advanced technology, trusted by professional mariners and boating enthusiasts alike.

Multi-Port Fuel Injection (MPI) – Intelligent Fuel Control

The 350 MPI’s Multi-Port Fuel Injection system ensures clean, efficient, and precise fuel delivery to every cylinder, resulting in maximum power with minimal fuel consumption.

MPI System Benefits

• Rapid starts in all temperatures

• Reduced fuel use and emissions

• Smooth idle and linear acceleration

• Reliable performance under heavy loads

Optimized for fuel economy, this system offers one of the most cost-efficient operating profiles in its class.

SmartCraft Integration & Engine Guardian Protection

Equipped with Mercury’s SmartCraft digital system, this model provides advanced engine management, diagnostics, and performance feedback in real time.
Paired with ECM 555 Engine Guardian, it continuously monitors vital systems to protect the engine from potential damage.

SmartCraft & Engine Guardian Advantages

• Real-time fuel flow, RPM, and temperature data

• Early alerts for maintenance or system faults

• Integrated DTS readiness for smooth digital throttle control

• Peace of mind through automated protection and shut-down prevention

This makes the MerCruiser 350 MPI one of the smartest, most self-protecting inboard engines available today.

Marine-Grade Durability for Any Environment

Built to thrive in both freshwater and saltwater conditions, this engine incorporates corrosion-resistant materials and marine-grade engineering throughout.

Key Construction Features

• Nodular iron crankshaft – absorbs torsional loads for long life

• Vortec cast-iron heads – optimized for marine cooling and airflow

• Roller camshaft – ensures smooth operation and reduced friction

• Hypereutectic pistons (9.4:1 compression) – designed for strength and efficiency

• Stainless-steel valves – resist corrosion and maintain sealing integrity

This engine’s solid V-8 design ensures exceptional torque, longevity, and maintenance simplicity, whether used for cruising, watersports, or workboats.

Technical Specifications – MerCruiser 350 MPI Alpha / Bravo 300 PS

Ideal for Repower & Upgrade Applications

The MerCruiser 350 MPI Alpha / Bravo 300 PS is ideal for repowering older 5.0L and 5.7L engines, including EFI and MPI variants, as well as 350 MAG sterndrive systems.

Repower Benefits

• Drop-in compatibility with existing Alpha and Bravo drives

• Modern MPI fuel system replaces outdated carbureted setups

• SmartCraft digital compatibility for next-gen monitoring

• Quieter, cleaner, and more fuel-efficient operation

JB Marine GmbH offers repower consultation, installation guidance, and technical support, ensuring that your new engine integrates seamlessly with your vessel.

Warranty & After-Sales Support by JB Marine GmbH

Each MerCruiser 350 MPI engine sold by JB Marine GmbH is covered by Mercury’s 3-year limited factory warranty, with optional extensions for up to 5 years.

Warranty Coverage

• 3-Year Manufacturer Warranty (parts & labor)

• Optional Mercury Product Protection (MPP) – up to 5 years total

• Comprehensive Europe-wide support from JB Marine GmbH

After-Sales Support Includes

• Expert guidance for engine setup and tuning

• Genuine Mercury parts and accessories

• Maintenance packages and service assistance

• Fast, insured shipping across Europe

When you buy from JB Marine GmbH, you gain a trusted authorized European Mercury & MerCruiser dealer committed to long-term customer satisfaction.

Frequently Asked Questions (FAQ)

 How does the MerCruiser 350 MPI Alpha / Bravo compare to older models?
It offers better torque, fuel efficiency, and smoother throttle response, along with SmartCraft diagnostics and DTS readiness for electronic control.

 Is it suitable for saltwater use?
Yes – the engine features corrosion-resistant components and a closed cooling system, ensuring long life in marine environments.

 What fuel does it require?
It runs on 87-octane unleaded gasoline, delivering the best combination of performance and efficiency.

 What maintenance does it require?

• Oil and filter change every 100 hours or annually

• Cooling system inspection after each season

• Spark plug and fuel filter replacement every 300 hours

 Where can I buy this engine?
Directly from JB Marine GmbH, your authorized Mercury Marine and MerCruiser supplier in Germany and Europe.

Order Your MerCruiser 350 MPI Alpha / Bravo 300 PS Today

Upgrade your vessel with one of the most reliable and efficient inboard engines ever built.
The MerCruiser 350 MPI Alpha / Bravo 300 PS (8M0188295) offers cutting-edge technology, dependable power, and world-class performance — all backed by JB Marine GmbH’s expert service and Mercury Marine’s warranty protection.

👉 Visit JBMarineGmbH.de to request pricing, availability, or technical support.
Trust JB Marine GmbH — your premier European partner for MerCruiser and Mercury Marine engines.