Enjoy your ride - about car

Dodane: 21-08-2016 12:17
Enjoy your ride - about car oil for Aston Martin

Necessary documents relating to the sale of the car

Sales of the car is not as simple a matter as it might seem. True, the same finding the client is often a matter of just a few days, especially when using the popular online advertising services to issue our offer and we offer a really reasonable price, but still the same conduct sales can be complicated. Where to find information on necessary documents during such an operation? As in many other things, also in this respect excellent advice can be found on websites relating to the automotive industry. It must be remembered that the use of proven services, which the authors present always reliable and proven content.


Crankcase scavenged

Crankcase scavenged
Diagram of a crankcase scavenged 2-stroke engine in operation

Some SI engines are crankcase scavenged and do not use poppet valves. Instead the crankcase and the part of the cylinder below the piston is used as a pump. The intake port is connected to the crankcase through a reed valve or a rotary disk valve driven by the engine. For each cylinder a transfer port connects in one end to the crankcase and in the other end to the cylinder wall. The exhaust port is connected directly to the cylinder wall. The transfer and exhaust port are opened and closed by the piston. The reed valve opens when the crankcase pressure is slightly below intake pressure, to let it be filled with a new charge; this happens when the piston is moving upwards. When the piston is moving downwards the pressure in the crankcase increases and the reed valve closes promptly, then the charge in the crankcase is compressed. When the piston is moving upwards, it uncovers the exhaust port and the transfer port and the higher pressure of the charge in the crankcase makes it enter the cylinder through the transfer port, blowing the exhaust gases. Lubrication is accomplished by adding 2-stroke oil to the fuel in small ratios. Petroil refers to the mix of gasoline with the aforesaid oil. This kind of 2-stroke engines has a lower efficiency than comparable 4-strokes engines and release a more polluting exhaust gases for the following conditions:

They use a total-loss lubrication system: all the lubricating oil is eventually burned along with the fuel.
There are conflicting requirements for scavenging: On one side, enough fresh charge needs to be introduced in each cycle to displace almost all the combustion gases but introducing too much of it means that a part of it gets in the exhaust.
They must use the transfer port(s) as a carefully designed and placed nozzle so that a gas current is created in a way that it sweeps the whole cylinder before reaching the exhaust port so as to expel the combustion gases, but minimize the amount of charge exhausted. 4-stroke engines have the benefit of forcibly expelling almost all of the combustion gases because during exhaust the combustion chamber is reduced to its minimum volume. In crankcase scavenged 2-stroke engines, exhaust and intake are performed mostly simultaneously and with the combustion chamber at its maximum volume.

The main advantage of 2-stroke engines of this type is mechanical simplicity and a higher power-to-weight ratio than their 4-stroke counterparts. Despite having twice as many power strokes per cycle, less than twice the power of a comparable 4-stroke engine is attainable in practice.

In the USA two stroke motorcycle and automobile engines were banned due to the pollution, although many thousands of lawn maintenance engines are in use.citation needed

Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine


Employment in the automotive industry

Jobs in companies related to the automotive industry is a dream for many people interested in this subject outside working hours. By the way, the combination of working with passion can be very desirable in many cases because it makes the work simply better. Where to find work in the industry? The possibilities are really a lot. Starting from corporate stores selling car straight from the factory, production, and ending with the consignment of used cars person interested in such work will certainly find a place for themselves. True, the requirements for work on some of the positions are quite high, but having the necessary qualifications for sure we have a chance of winning the coveted job.