Diesel engines built by foreign firms, have their own designations . In the grades of marine diesel engines, "Burmeister and Vine" letters stand for: M - four-, V - stroke (second grade at the end of V - v-shaped), the T-cross-head, F - marine (Reversible and irreversible main series MTBF), B - with a turbocharged, H - support. The number of cylinders is specified before the letters, the diameter of the cylinder - a number of cylinders, stroke - after the letters. In the cross-head diesel engines with supercharged modification shown in the middle of the distinguishing mark number 2 or 3. The main factor determining the specific speed and strength of the diesel is the average piston speed (m / s) st = Sn / 30, where S - stroke, m, n- speed, rev / min. According to GOST 4393-74 * all diesels, including shipping, is conventionally divided into low-speed, high-speed and high-speed (the speed of the piston is equal to 7, 7-10, 10 m / s). For the analysis of individual processes (Fuel injection, blowing, etc.), marine diesel engines are divided into small, medium and high-speed (rotational speed, respectively, to 350, 350 - 750 and 750 rev / min). It must be borne in mind that the division only on the frequency of rotation is not fully determines the thermal and dynamic tension motor.
The main types of structures of marine diesel engines used on Navy ships, are the most common single-acting diesels with a purge transverse (plant "Russian diesel" and companies "Sulzer", "Fiat"), direct flow-valve (firms ("Burmeister and Vine", "Stork", "Getaverken"), loop (IAS firms, "Polar"); Ship internal combustion engines with divergent pistons and the co-current purge (such as domestic engines ZD100, firms' Doxford 'and' Burmeister and Vine "), double-acting diesel engines (MAN firms," Burmeister and Vine "," Fiat "Stork", etc.) - Most of the main engines of vessels Navy are two-stroke diesels simple steps. Four-stroke is most often used as auxiliary or main low-power (1100 kW). With such power, these diesel engines through the use of High boost the size, weight and cost exceeds two-stroke diesel engines. However, overseas produced four-stroke power 4400 - 8000 kW or more (MAN, "Pilstik", "Fiat", etc.) which have cylinder 350-1100 kW power. They are used as the main marine diesel engines on cruise ships in the diesel-gear units. Many of these types of engines ("Pilstik, Wartsila, etc.") are set on the Russian courts.