What is a Two-stroke engine?
In order to become efficient in tunning, you first need to know the basics. In this post I’ll demonstrate to you how a basic two-stroke engine works, found in most of lower class motorcycles..
Where is a 2-Stroke engine used?
It’s mostly used in chainsaws, lawn movers, jet skies, motorcycles etc.. Because it’s a small weighted engine and produces twice the power compared to four-stroke.
Two-stroke advantages:
They don’t have valves, which simplifies their construction and lowers the weight.
They can work in any orientation, which can be very important in devices like a chainsaw.
They fire once every revolution, while four-stroke fire once every other revolution.
How a Two-stroke engine works?
So as you can see in this picture, a mix of fuel and air is sucked from fuel/air inlet port into crankcase. Then the mixture gets to the combustion chamber through transfer port. Once the mixture is in c-chamber it eventually gets compressed by the movement of piston. When it’s compressed enough spark plug fires and mixture ignites. The resulting explosion drives the piston downward. As piston moves downward, the exhaust pipe is uncovered . It’s rather easy really, it’s not a rocket science!
Disadvantages of Two-stroke
Everything that’s ingenious in something, has to have some disadvantages, and the two-stroke engine is in no way different. So as you, hopefully, learnt from above, two-stroke engines are lighter and they produce twice the power.. But why don’t the trucks and cars use it then?
Well, as seems two-stroke engines don’t last nearly as long as four-stroke engines. The lack of a dedicated lubrication system means that the parts of a two-stroke engine wear a lot faster and two-stroke oil is expensive, and you need about 4 ounces of it per gallon of gas.
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