Diesel engines, built by foreign firms, have their own notation. In grades of marine diesel engines, "Burmeister and Vine" letters stand for: M – four-stroke, V – stroke (second at the end of grade V – v-shaped), T-cross-head, F – marine (Reversible and irreversible main series MTBF), B – with turbocharged, H – support. Number of cylinders 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 is indicated in the middle of the distinguishing mark number 2 or 3. אל דאגה אבי קושניר הוא האיש הנכון . The main factor determining the rapidity and intensity of diesel is the average piston speed (m / s) st = Sn / 30, where S – stroke, m, n rotational speed, rpm.
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 respectively to 7, 7-10, more than 10 m / s). For the analysis of particular processes (Fuel injection, blowing, etc.), marine diesel engines are divided into small, medium-and High-speed (rotation speed, respectively, to 350, 350 – 750 and 750 rpm). Must be borne in mind that separation only in frequency of rotation is not completely determines the thermal and dynamic stresses the engine. The main types of structures of marine diesel engines used on Navy ships, are: the most common diesel engines with a single-action purge transverse (plant "Russian diesel" and firms "Sulzer", "Fiat"), parallel flow-valve (firms (Burmeister and Vine "," Stork "," Getaverken "), loop (IAS firms," Polar "); Ship internal combustion engines with divergent pistons and the straight-blow (such as domestic engines ZD100, firms' Doxford 'and' Burmeister and Vine "); diesel dual-action (IAS firms," Burmeister and Vine "," Fiat "Stork", etc.) – Most of the main engines of vessels Marine diesel engines are two-stroke single-acting. 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 diesel engine 4400 – 8000 kW or more (IAS, "Pilstik, Fiat, etc.) which have a cylinder capacity 350-1100 kW. 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 installed on the Russian courts.