The Volvo Penta TAMD 4 and 6 liter diesel engines for inboard propulsion were reliable and economic marine engines with considerable power resources, developed for planing craft. With their compact dimensions, they were excellent for twin installations. Direct injection (DI) resulted in a low thermal load and low fuel consumption compared with swirl chamber engines (IDI) with the same cylinder capacity. The engines were turbocharged with an exhaust-driven turbocompressor. More air could be forced into the cylinder in this way, resulting in more fuel being injected and the engine running more efficiently. The aftercooler cooled the compressed and heated air and raised its oxygen content so that the engine could use the fuel more efficiently. The direct injection, turbocharging, and aftercooler contributed to minimizing noxious exhaust emissions and enhancing overall enjoyment of boating. Volvo Penta's hydraulically shifted reverse gear was specially developed to increase the standard of comfort on board in terms of quiet running, greater reliability, and enhanced efficiency. The combination of 8° down angle, large drop center, and small dimensions provided for optimized installations. A trolling valve kit was available to meet special demands, e.g., for sportfishing. Although the TAMD series is no longer available, its legacy lives on as a testament to its exceptional performance and reliability.
