2-stroke engine vs 4-stroke engine

The Difference Between Two-Stroke and Four-Stroke Engines. Internal combustion engines convert chemical energy into the mechanical energy used to power a vehicle or other equipment via a combustion event requiring air, fuel and a source of ignition. The terms two-cycle and two-stroke are often interchanged, as are four-cycle and four-stroke. Each upward or downward movement of pistons in the engine is called a stroke. The fundamental difference between two-stroke and four-stroke engines is how they introduce air and fuel for combustion to create power, then remove exhaust gases after each combustion cycle. Four-Stroke Engine Chamber Design A four-stroke engine uses intake and exhaust ports positioned at the top of the combustion chamber. Intake and exhaust valves control the opening and closing of the ports to manage incoming and exiting gases. The intake port controls the incoming air, providing air that reacts with the fuel when ignited. The exhaust port expels the resulting gases, including water vapor (H2O), carbon dioxide (CO2) and nitrogen (N2), out of the combustion chamber. Four-Stroke Engine Combustion Cycle A four-stroke engine requires two full revolutions of the crankshaft, thus four piston cycles, to complete the intake, compression, power and exhaust strokes. During the first revolution, the air-fuel mixture is drawn into the combustion chamber through the intake port and compressed. During the second revolution, the air-fuel mixture is ignited to create powe...

• Tweet • Share • Pin it There is a question that has been bandied around since the dawn of motocross time. Riders have debated this contentious subject in forums, at the trackside and in dealerships all over the world. Which makes the best dirt bike? Is it 2 stroke, or is it 4 stroke? Motocross Advice can finally bring you the definitive answer – The Ultimate Guide: 2 Stroke vs 4 Stroke Dirt Bike Engine. Drum roll, please! The answer is that it depends on what kind of riding you are doing and what level of ability you have. So don’t listen to the 2 stroke warrior who is berating 4 stroke riders at your local meet, telling you that you are not a “real dirt bike rider” unless you ride a stroker. Neither should you listen to the know-alls who promise you the low maintenance costs and smooth-riding of a 4 stroke. There is always going to be someone who will be ferociously defending their opinion, and telling you what you should think. Sorry, that probably isn’t what you wanted to hear, but it is the truth of the matter, and we always want to tell you the truth. And here is the truth; Table of Contents • • • • • • • • • • • • • • • Why ask the question 2 stroke vs 4 stroke? There are many factors to consider. You have to make the right decision for you. To do that you must understand the differences between the two types of engine. That is why we are here today. This article will compare two bikes, like for like. So that we make it a fair comparison, we are going to look at bi...

Throughout the many changes and innovations in automotive and engine design, one thing has remained a constant — the design of two-stroke and four-stroke engines. While you may have heard of these types of engines before, you may be asking yourself what the difference is between them. Here’s what you need to know about the efficiency and maintenance of each type of engine. Jump to Section • • • • • • • • • • What Is the Difference Between a 2-Stroke and 4-Stroke Engine? The main difference between a 4-stroke engine and a 2-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke, while a 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke. This means a 2-stroke engine can potentially produce twice as much power as a 4-stroke engine and also weigh less. 4-Stroke Engine • Intake:The intake valve is open, and fuel is drawn in with a downward stroke. • Compression:As the piston moves upward, the fuel is compressed. • Power:After the fuel is compressed, it is ignited to produce the engine’s power. • Exhaust:The exhaust valve opens, and the exhaust gases exit the cylinder. 2-Stroke Engine A The two-step process includes: • Upstroke (ignition/compression):The piston goes up, air and fuel enter the crankcase. The fuel-air mixture is compressed and ignited. • Downstroke (power/exhaust):Once the fuel is ignited, the piston is pushed down, and the exhaust is expelled. Both e...