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Two cycle Engine Applications and Lubrication

Two cycle Engine

Applications and Lubrication Needs

The best two cycle engine oil

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Two cycle engines can be found nearly everywhere these days. They are used in dozens of applications and in a wide variety of designs for everything from work and recreation to power generation. two cycle engines have design differences and operate under conditions that require different oil chemistries than their four-cycle counterparts. In order to recommend a lubricant for a two-cycle engine, one needs to know how this engine operates, why it is used in place of a four-cycle engine and where and in what type of applications it is used.

Two cycle Engine

What is a two cycle engine? How do two cycle engines work?

Two cycle engine

Two cycle engine

The terms “two-cycle” and “two-stroke” are often inter-changed when speaking about two cycle engines. These engines derive their name from the amount of directional changes that the pistons make during each power stroke. Internal combustion engines are used to produce mechanical power from the chemical energy contained in hydrocarbon fuels. The power-producing part of the motor’s operating cycle starts inside the motor’s cylinders with a compression process. Following this compression, the burning of the fuel-air mixture then releases the fuel’s chemical energy and produces high-temperature, high-pressure combustion products. These gases then expand within each cylinder and transfer work to the piston. Thus, as the engine is operated continuously, mechanical power is produced. Each upward or downward movement of the piston is called a stroke. There are two commonly used internal combustion engine cycles: the two-stroke cycle (Two cycle engine) and the four-stroke cycle.

Two cycle Engine

How are two cycle engines different from four-cycle engines?

Two cycle engine

Two cycle engine

The fundamental difference between two cycle engines and four-cycle engines is in their gas exchange process, or more simply, the removal of the burned gases at the end of each expansion process and the induction of a fresh mixture for the next cycle. The two cycle engine has an expansion, or power stroke, in each cylinder during each revolution of the crankshaft. The exhaust and the charging processes occur simultaneously as the piston moves through its lowest or bottom center position.

In a four-cycle engine, the burned gasses are first displaced by the piston during an upward stroke, and then a fresh charge enters the cylinder during the following downward stroke. This means that four-cycle engines require two complete turns of the crankshaft to make a power stroke, versus the single turn necessary in a two-cycle engine. In other words, two-cycle engines operate on 360 degrees of crankshaft rotation, whereas four-cycle engines operate on 720 degrees of crankshaft rotation.

Where are two cycle engines used?

Two-cycle engines are inexpensive to build and operate when compared to four-cycle engines. They are lighter in weight and they can also produce a higher power-to-weight ratio. For these reasons, two-cycle engines are very useful in applications such as chainsaws, Weedeaters, outboards, lawnmowers and motorcycles, to name just a few. Two-cycle engines are also easier to start in cold temperatures. Part of this may be due to their design and the lack of an oil sump. This is a reason why these engines are also commonly used in snowmobiles and snow blowers.

Some advantages and disadvantages of two-cycle engines

Because two-cycle engines can effectively double the number of power strokes per unit time when compared to four-cycle engines, power output is increased. However, it does not increase by a factor of two. The outputs of two-cycle engines range from only 20 to 60 percent above those of equivalent-size four-cycle units. This lower than expected increase is a result of the poorer than ideal charging efficiency, or in other words, incomplete filling of the cylinder volume with fresh fuel and air. There is also a major disadvantage in this power transfer scenario. The higher frequency of combustion events in the two-cycle engine results in higher average heat transfer rates from the hot burned gases to the motor’s combustion chamber walls. Higher temperatures and higher thermal stresses in the cylinder head (especially on the piston crown) result. Traditional two-cycle engines are also not highly efficient because a scavenging effect allows up to 30 percent of the unburned fuel/oil mixture into the exhaust. In addition, a portion of the exhaust gas remains in the combustion chamber during the cycle. These inefficiencies contribute to the power loss when compared to four-cycle engines and explains why two-cycle engines can achieve only up to 60 percent more power.

How are two-cycle engines lubricated?

Two-cycle motors are considered total-loss type lubricating systems. Because the crankcase is part of the intake process, it cannot act as an oil sump as is found on four-cycle engines. Lubricating traditional two-cycle engines is done by mixing the oil with the fuel. The oil is burned upon combustion of the air/fuel mixture. Direct Injection engines are different because the fuel is directly injected into the combustion chamber while the oil is injected directly into the crankcase. This process is efficient because the fuel is injected after the exhaust port closes, and therefore more complete combustion of fuel occurs and more power is developed. Direct injection engines have a higher power density than traditional two-cycle engines. Because the oil is directly injected into the crankcase, less oil is necessary and lower oil consumption results (80:1 range). Direct Injection motors have higher combustion temperatures, often up to 120F. They also require more lubricity than traditional two-cycle motors.

 

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Posted on November 26, 2011 by , 1 comment

Look Online For ATVs For Sale

Different people choose different things to do with their down time. Some people love to work in their garden or yards. Others enjoy being outdoors on the water for fishing or boating. There are others who can’t wait to get outside and explore new areas either on foot or on vehicles. Those are the people who should look online to find ATVs for sale.

All terrain vehicles, also called four wheelers, are a great way to explore areas that roads do not go to. Built on sturdy metal frames, these vehicles are rough and rugged. They pack powerful engines that give good speed, while the strong tires give stability over rocky ground. Most even come with a headlamp that illuminates the way during night hours.

If not riding these machines for fun, they are also useful for hunters. Men and women who hunt usually have a lease located in secluded areas. They will normally drive to an area near their lease and walk the remaining way. Instead of walking, however, some hunters have figured out that their four wheeler cuts the amount of time it takes to get to the lease. Not only that, most of the supplies can be loaded on the vehicle as well.

Once at the lease, if the sportsman is successful there is usually an animal going back to the truck. Instead of dragging or carrying the animal, it can be easily strapped to the ATV for safe delivery. On top of that, the supplies can be loaded at the same time. Once back at the main camp, the four wheeler is easily loaded by using a ramp.

These vehicles have also proven themselves to be valuable of working farms and ranches. These areas often have hundreds of acres that must be patrolled. In the past, horses were saddled and the crew would ride the fence line looking for breaks. Now, instead of horses, four wheelers are used. The crew packs all of the necessary repair items and jumps on to ride the fence line. It is faster and more efficient than the days of old.

Some farmers and ranchers have even purchased a small fleet of ATVs for their work crew. The machines work better than trucks because they can be driven off-road with few bad effects. There are rarely blown tires or overheated engines on these machines. With the crew using the vehicles, most of the work is completed faster than without them.

These fun and useful vehicles have grown in popularity over the years. This popularity has made it easier to find one at a decent price. Online advertising is the most effective method of getting one at a good price. The offer a variety of new and used models. If that does not work, then a traditional newspaper advertisement can help. If it is still difficult to find one at a good price, the buyer can look to the dealerships. They frequently have new and used options available.

Whether the person looks for new or used machines, there are plenty of ATVs in most areas. Researching the different features and brands can help steer a buyer in the right direction. Once located, the best part is purchasing one and having loads of fun.

If you’re looking for atvs for sale or snowmobiles for sale, make it part of your purchasing routine to check the blue book value to insure you get the best bang for your buck.

Amsoil synthetic oil products for ATV

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Posted on July 16, 2011 by , 2 comments

Affordable And Cool ATVs For Sale

If you are looking for a perfect outdoor adventure, there are many ATVs for sale available today. All terrain vehicles are very popular nowadays to the young kids, teenagers, adults, and sports fanatics. It offers a wide range of benefits because it can be used for transportation, traveling, and recreational purposes. It can give you enjoyment, fulfillment, and thrilling adventures.

This kind of vehicle has the capacity to travel smoothly and run on any type of area, like muddy terrain, mountainous surface and sandy grounds. It is very perfect for those who loves outdoor escapades and unexpected thrilling experience. It can offer you fun, physical action, lots of laugh and smiles, and learning quick strategy and initiative. These vehicles can be used to all ages, so it is truly a user-friendly bike.

It comes with different designs depending on age, colors, models, dimensions, sizes, and made for different reasons. So you have a lot choices and it has available accessories like for safety purposes helmets and other head gears, mitts and thick footwear, protective eye glasses, boots elbow and ankle support. These protective gears should be given to both adults and youngsters to provide and prevent fatal accidents, and could safeguard your all body parts.

To have a good picture of ATVs, the most preferred and used all-terrain vehicles are the three wheelers because it is easy to control and to maneuver. It is also good for starters in learning how to manipulate in handling to drive the vehicle. It is advisable that your kids must be assisted with trainers and experts, but most adults choose to have the three wheelers because of its wide range of models good for all ages.

Next are the four wheeler bikes which have an extra support and stylish accessories which made it more popular and reputed in all countries. This is usually used by those who are looking for more stable and balanced type of vehicle. It is also very easy to use because of its proportionate vehicle structure.

Another are the six wheeler all-terrain vehicles, which has more wheels than the usual ATVs. The usage of these several wheels is to make it stronger to carry heavy loads of goods and other items. It is the smallest version of jeeps because of its the same structure, shape and design. These ATVs are not often used in driving on highways and streets.

The next type of all-terrain vehicles are the sand rails. These are not used for adventurous outdoor purposes because the moving and transportation features of these types utilizes special tracks. It is more suitable and applicable for commercial purposes such as delivering and transferring goods and other products from one location to a nearby location. This vehicle is more appropriate for transporters and movers of goods and commercial products. However, these kind of ATVs are quite expensive.

These are the basic and main types of all-terrain vehicles present today. They are very perfect for your needs may be it for work and adventure purposes. There are many available vehicles at very affordable prices, so better check these ATVs for sale both online and offline markets before it is too late.

If you’re looking online for snowmobiles for sale or harley davidson for sale make sure to do your research and compare prices to insure the best deal possible.

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Posted on June 10, 2011 by , Reply