Steyr Motors GmbH Steyr MO164M40: Precision Marine Propulsion The Steyr Motors GmbH Steyr MO164M40 is a high-performance inboard diesel engine engineered for demanding marine propulsion applications, delivering seamless power to a wide array of vessels. As a 4-stroke, 4-cylinder inline diesel unit, it combines compact design with robust efficiency, making it an ideal choice for boatbuilders seeking dependable thrust in saltwater environments. Key technical specifications underscore its engineering excellence: Powered by diesel fuel, the MO164M40 produces 163 horsepower (119 kW) at a maximum operating speed of 4,000 rpm. Its 2,133 cm³ displacement features an 85 mm bore and 94 mm stroke, yielding a balanced bore-stroke ratio of approximately 0.90 for optimal torque delivery. With a high compression ratio of 17:1, it achieves superior thermal efficiency, while freshwater cooling safeguards against corrosion, and the direct-drive configuration ensures straightforward integration with marine transmissions. In marine contexts, the MO164M40 excels through its diesel heritage, offering exceptional durability and low maintenance in harsh conditions like wave exposure and humidity. Freshwater cooling minimizes scaling and extends component life, reducing downtime during extended voyages. Fuel efficiency—typical of diesels at lower consumption per horsepower-hour—lowers operational costs, while the engine’s sturdy construction resists fouling and vibration, enhancing overall vessel reliability. Performance-wise, this engine provides responsive acceleration and stable cruising, with strong low-end torque for planing hulls and high-RPM capability for sustained speeds. Its 4-stroke cycle ensures smoother operation, quieter exhaust, and reduced emissions, aligning with modern environmental standards without compromising power-to-weight ratios. Ideal for luxury cruisers, high-performance speedboats, offshore patrol vessels, sports yachts, fishing boats, and small ferries, the Steyr MO164M40 empowers mid-to-large recreational and commercial craft with versatile, long-lasting propulsion that prioritizes efficiency and endurance on the water. (248 words)