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Diesel engines operate on either the two-stroke or the four-stroke cycle in the cylinder. There are four strokes in these engines-the suction stroke, the compression stroke, the power working stroke(i. e. Combustion and expansion) and the exhaust stroke. Two revolutions of the crankshaft are required to complete the cycle. We see here the inlet valves and the exhaust valves.
In the two-stroke engine instead of valves there are ports- the exhaust ports'and scavenge ports. The stokes constitute the cycle- the compression stroke and the power stroke (i. e. Combustion, expansion and scavenging). One revolution of the crankshaft is required to complete the cycle.
The "Horizont" is a motorship. Her d. W. Is 6, 1271; power- 3250 h.p.,speed-13 knots with the engine-room located amidships. She is equipped with MAN K-6-Z-57/80 mm (i.e. cylinder bore and piston stroke)diesel engine crosshead two-stroke, reversible, with loop scavenging, developing 185 r.p.m.
Exhaust gases leave the cylinder through the exhaust ports to the constant- pressure turbine, which drives centrifugal air compressor. Scavenging port are located lower than the exhaust ones.
The motion from the piston and piston rod is transmitted to the crankshaft through the crosshead and connecting rod.
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