Volvo Penta AQ171C: Reliable Inboard Propulsion for Marine Excellence The Volvo Penta AQ171C is a robust inboard gasoline combustion engine engineered for dependable boat propulsion in demanding marine environments. Produced by Volvo Penta during a specialized run from 1987 to 1989, this transitional model exemplifies the brand’s commitment to blending power, efficiency, and durability in late-1980s marine engineering. Key technical specifications underscore its straightforward yet effective design: an inline-four cylinder configuration delivers 167 horsepower (122 kW) at the crankshaft, fueled by gasoline for optimal torque and responsiveness. As an inboard system, it integrates seamlessly with the vessel’s hull, often pairing with a dual-speed reduction gearbox for versatile drive options. Crafted with marine-grade materials—including stainless steel components and corrosion-resistant coatings—the AQ171C features a compact footprint and low center of gravity, while its signature red-and-green color scheme, accented by six radiating red triangles, aids in quick visual identification. Marine-specific benefits shine through in its rugged reliability, tailored to withstand saltwater exposure and harsh conditions without compromising longevity. The inline-four layout minimizes vibration for smoother underway operation, enhancing crew comfort and reducing structural fatigue on prolonged voyages. Maintenance is streamlined, with accessible components like the oil filter and impeller, making routine servicing efficient even in remote anchorages. Performance characteristics highlight a strong power-to-weight ratio, providing robust thrust for mid-sized vessels while prioritizing fuel efficiency and low-end torque for confident maneuvering. This engine excels in applications such as cabin cruisers, trawlers, and commercial fishing boats, where its versatility supports both recreational day trips and extended commercial operations. Ideal for owners seeking a proven, no-frills propulsion solution, the AQ171C remains a testament to Volvo Penta’s heritage in delivering enduring marine performance. (Word count: 278)