Masnedø Marinecenter A/S Vire 12: Reliable Inboard Propulsion for Small Vessels The Masnedø Marinecenter A/S Vire 12 is a compact, gasoline-powered inboard engine engineered for dependable marine propulsion in small boats and auxiliary applications. As a single-cylinder, 2-stroke design, it delivers straightforward power and efficiency, making it a staple for operators seeking simplicity and robustness in saltwater environments. Key technical specifications underscore its practical engineering: It produces 12 horsepower (8 kW) at the crankshaft from a 269 cm³ displacement, with a balanced 70 mm bore and 70 mm stroke for oversquare efficiency at higher RPMs. The 9:1 compression ratio optimizes thermal performance for 2-stroke operation, while the 2.7:1 reduction gear ensures smooth torque multiplication to the propeller shaft. Weighing just 66 kg (145 lbs) and measuring 480 mm (L) × 445 mm (W) × 425 mm (H), it features seawater cooling for direct heat dissipation and electric starting for reliable ignition in damp conditions—no freshwater system required. Marine-specific benefits shine through its 2-stroke architecture, which eliminates valve trains and complex oiling, minimizing maintenance and downtime amid corrosion-prone seas. The lightweight construction lowers vessel draft and enhances stability by positioning the engine inboard, close to the keel for a reduced center of gravity. Its durable piston and cylinder assembly, proven over production from 1975 to 2002, withstands humidity, saltwater exposure, and vibration, while the seawater-cooled system sustains prolonged runs without overheating. Performance-wise, the Vire 12 excels in low-speed torque delivery via its reduction gearing, ideal for controlled maneuvers or auxiliary loads like winches and generators. It offers a high power-to-weight ratio—over 0.18 hp/kg—for agile handling without excessive fuel draw, though it’s optimized for displacement rather than high-speed planing. This engine suits dinghies, tenders, rigid inflatables, and inshore fishing vessels, where quiet 2-stroke operation aids stealthy approaches and compact sizing fits tight engine bays. For operators prioritizing reliability, ease of service, and marine resilience, the Vire 12 remains a timeless choice in auxiliary or primary propulsion roles. (Word count: 278)