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- Year/Month: 2010/0
- Stock ID: T120475
- Transmission: Manual
- CC: 0
- Mileage: 0
- Fuel Type: Diesel
- 41 Views
You have probably never heard of the existence of two-stroke diesel engines as a scania r440 highline for sale driver , simply because almost all diesel engine production today is four-stroke. Yet these engines are famous for being simple, long-lived and developing enormous torque. A fantastic performance which, however, involves consumption and high pollution. For this reason, they are no longer used for commercial use today.
Drive Rotation
In a two-stroke diesel the thermodynamic cycle occurs in a single rotation of the driving axle. We therefore have the steps: suction + compression; the air is introduced into the combustion chamber through suction ports, obtained in the cylinder, which are discovered by the movement of the piston. The opening image of the article should give you a good idea. diesel injection with subsequent combustion and exhaust of the gas through two or four valves located on the cylinder head, or through exhaust ports obtained in the cylinder itself. The latter mode finds its application in small or huge petrol engines. The air entering the cylinders, for example in the Detroit Diesel, is often further compressed thanks to a volumetric compressor placed precisely between the turbocharger and the combustion chamber. Two-stroke diesel engines were used extensively in the first half of the nineties in the marine, agricultural, earthmoving, railways, power generators and heavy-duty road transport sectors. In the agricultural field for example, the Landinetta was the first diesel engine to be used, and was a two-stroke. Alfa Romeo vans and Lancia heavy trucks also had two-stroke engines, strictly diesel. In earth moving, the they continue to function today. But above all in America where all heavy transport on wheels was powered by two strokes, with the unmistakable sound of Detroit Diesel.
Very Easy
Besides, in the perspective of Advantages and disadvantages compared to a four-stroke diesel engine, a scania r440 highline price payer need to aware, The main advantage of a two-stroke diesel engine compared to a four-stroke one lies in the fact that these engines guarantee a supply of power and torque that the most common four-stroke cars dream of having… just think that today they are used only on sports motorboats , right where you need a lot of power. The reason is very simple: if a four-stroke engine has a production phase every two turns of the crankshaft, the two-stroke one has one at each revolution. It is a bit as if, with the same displacement, the power supplied by a two-stroke was double compared to a four-stroke. Returning to the first half of the ninetees, the two strokes were also used because mechanically they were very simple and reliable, with low maintenance costs. Unfortunately consumption and above all the high emission of particulate matter into the atmosphere has meant that the use of these engines has been reduced until they disappear. The operating principle of a two-stroke engine is quite simple: as mentioned, the four phases (intake, compression, burst and discharge) take place within a single turn of the crankshaft. Besides, it will be better to know about petrol-powered petrol engine too; It is the second most popular engine is used by those who do not do distant travel and want to buy a cheaper vehicle than those equipped with diesel or hybrid engines. Drivers are often undecided in front of the same car model but with a petrol or diesel engine. The assessment is entirely subjective, there is no "better" or "worse" and is based on real needs.
Disposable Lubrication
If in advanced engines the intake and exhaust are controlled by the opening and closing of the respective valves, in 2T engines it is the movement of the piston inside the cylinder that dictates the times through the "lights". These are simple slits made inside the cylinder, which are opened and closed by the movement of the piston, both during the ascent to the Upper Dead Point (when suction and compression take place) and during the descent towards the Lower Dead Point. In the first case the lights are supplied by the pump casing, where the pre-stressing takes place; after the priming of the mixture, which takes place through the spark plug, while the piston goes down, the unloading phase begins. The speed with which everything must take place is, as said, twice that of a advanced stroke, which tends to make the chemical phenomena required by combustion less complete; above all, in certain phases of the movement of the piston both the intake and exhaust ports can be opened, so that a part of the mixture can go out even before combustion has started. This short circuit is the main problem of the two stroke in terms of efficiency and above all emissions, to which is added the fact that lubrication is disposable, the oil is in fact burned together with the fuel, often not completely. This explains the smokiness and oily residues that we can find inside the exhaust systems of two stroke vehicles. As it is easy to understand, solving the intrinsic defects of the two stroke is not easy if you do not want to lose its fundamental advantage: simplicity of construction and maintenance.