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You cannot classify one as "better" than another. Best in terms of what? Efficiency? Power? Maintenance? etc.
the two-stroke motor complete with a tuned resonance pipe will give superior specific-power over its four-stroke counterpart over a very limited rev range. The two stroke motor makes one power pulse for every rotation of the crankshaft, so a 2-stroke motor will make more torque (and consequently, power) than a 4-stroke motor of the same displacement. This comes at a price, however. The 2-stroke powerband is much more peaky, while the 4-stroke powerband is much more torquey; meaning that the 4-stroke is much more liveable when used in a vehicle, for example. Furthermore, because the 4-stroke motor "breathes" better -- it actually uses the motion of the crankshaft to force air out of the motor whereas the 2-stroke uses the intake charge to accomplish the same task -- it has much better cylinder-scavenging leading to better economy. The combustion is also more cleanly regulated leading to lower emissions. Finally, there is no crankcase with which to contain the oil, so lubrication must be accomplished with the fuel. This means complete combustion of oil and much poorer engine lubrication. This equates to frequent rebuilds.
In short:
2 stroke = more power, less displacement and weight
4 stroke = more uniform powerband, greater economy
What else can I help you with?
What is the difference between a 2 stroke and a 4 stroke lawn mower engine?
Four-stroke engines have a spout where you add oil to the engine. On two-stroke engines, oil has to be added to the fuel. (Four-stroke and two-stroke are also called four-cycle and two-cycle, respectively).
Why you prefer four stroke engine over two stroke engine?
Four stroke engines are quieter than two strokes, but have less power.
Are the tug boat engines are two stroke or four stroke?
All tug boat engines are four stroke engines, because this engine responces quickly in relation to maneuvering this kind of boat in any situation.
Why 2 stroke diesel engines are not used in two wheelers?
Two stroke engines will create a lot of visible smoke pollution and also more noise than four stroke engines. For these reason, many countries have required that all new motorcycles should be four-stroke.
Will four stroke oil damage two stroke engine?
You can use four stroke oil for a (very) limited period in a two stroke engine in an emergency. However it is not formulated for two stroke engines and is not recommended.
Are kawasaki motorcyles two stroke or four stroke?
Assuming you are referring to a street legal motorcycle (IE: Kawaski Vulcan, Ninja, etc.) these machines have four stroke engines. Dirt Bikes and such sometimes do not. Two-stroke engines generally use a fuel+oil mixture. (Such as a weed whacker) Four stroke engines generally have an oil sump. (Like a car)
Four-stroke cycle engines are more fuel efficient than two-stroke engines?
Unless we are talking about big diesels - Yes.
Distinguish 2 stroke from 4 stroke lawn mowers?
Four-stroke lawn mowers have a tube where you add oil to the engine. On two-stroke engines, oil has to be added to the fuel. (Four-stroke and two-stroke are also called four-cycle and two-cycle, respectively).
What is the difference between two stroke and four stroke engines in two wheelers?
The difference between 2stroke engines and 4-stroke engines are pretty much the same regardless of where the engine is used. To read about it, check out the related question below.
In two stroke engine Crankshaft how many revolution takes place?
A two stroke engine has half the strokes of an otto (or four stroke) engine, therefore it takes two crankshaft roatations to complete a cycle on a four stroke engine and only one revolution in a two stroke engine. There are several types of two stroke engines, the different types have to do with how the receive the air/fuel mixture, also you have two stroke diesel engines.
What are advantages of two stroke engines over four stroke engines?
There are a couple, less parts for one therefore lighter. Also, 2 stroke engines fire every time the piston comes to the top. Which means every stroke is a power stroke. 4 stroke engines fire every other time.
How to Choose an Outboard Motor?
Instead of buying a new boat, the best alternative may be simply purchasing a new motor. For those that have fishing boats and other working craft, he or she probably has an outboard motor, which are popular on these particular vessels. Outboard motors can be found in a number of places although it is best to purchase one from an authorized dealer or someone that is trustworthy. The reason for this is that simply outboard motors require special knowledge of engine parts to repair and refurbish. If the proper care and time is not taken for the repair, the motor could fail at the most inopportune time.Four Stroke EnginesThe most popular outboard engines of the present are the quiet and reliable four-stroke engines. These engines have recently made their debut over the last ten years because of their ease of use. Four-stroke engines do not use oil as two-stroke engines do, and they also use less gas than two-stroke engines. Also, the four-stroke engine is much quieter than the noisy two-stroke engine, which makes it far less intrusive for those long trips to the Gulf Stream. The only down-side to four-stroke engines are that they are more expensive than two-stroke engines. Four-stroke engines are also considered safer to purchase from classified advertisements or other places. Four-stroke engines do not require specialized repair personnel for general maintenance and small repairs. A 150 horsepower engine can be found for prices starting at $5000.Two Stroke EnginesTwo-stroke engines are the most traditionally used outboard motor on the market. They incorporate the use of oil in their gas tanks and are said to be able to attain more overall torque than four-stroke engines. Two stroke engines are great engines and can be found re-built for relatively cheap. For instance, $500 will get one a two-stroke outboard motor up to fifty horsepower. The best place to look for two-stroke outdoor motors are at authorized used boat dealers or licensed small engine repair shops. Two-stroke engines are different from other engines and takes one with specialized knowledge to make even the most general repairs.
