What is the difference between a two-stroke and a four-stroke engine in cnc machining

Thu Sep 05 09:31:09 CST 2019

The engine crankshaft rotates one revolution and completes one working cycle after two strokes. So what is the difference between these two cnc machining engines? What are the advantages and disadvantages of each? Let us analyze this problem below. First let's take a look at the structural differences between the two engines. Both two-stroke and four-stroke, there are two kinds of gasoline engine and diesel engine.The biggest difference between a gasoline engine and a diesel engine is that the diesel machining engine has no ignition system, and the fuel supply systems of the two have a big difference; in terms of thermal efficiency, the diesel engine is higher. In order to better explain the difference between the two engines, I will talk about these institutions and systems separately.


The crank-link mechanism is the main moving part of the engine to achieve the working machining parts cycle and complete the energy conversion. It consists of a body group, a piston rod set and a crankshaft flywheel set. The structure of the piston rod set and the crankshaft flywheel of the two-stroke engine and the four-stroke engine are basically the same, the difference being the body group. The engine body group can be divided into two machining parts: the cylinder head and the cylinder block. For a four-stroke engine, its cylinder head structure is very complicated, with intake and exhaust valves, cooling water passages, oil passages, etc.; its cylinder block structure is relatively simple, generally only a closed cylinder.

The two-stroke engine is exactly the opposite. Its cylinder head structure is relatively simple. It is usually a simple cover. Even if there is a valve, there is only one exhaust valve. The cylinder block is more complicated in the cylinder wall. There are air inlets and exhaust machining ports on the top. Its overall structure can be divided into two major mechanisms, five major systems, namely crank-link mechanism, gas distribution mechanism, fuel supply system, lubrication system, cooling system, Ignition system and starting system.

Viola Lee

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