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Exhaust

Intake, induction or suction: The intake valves are open as a result of the cam lobe pressing down on the valve stem.

The piston moves downward increasing the volume of the combustion chamber and allowing air to enter in the case of a CI engine or an air fuel mix in the case of SI engines that do not use direct injection.

The air or air-fuel mixture is called the charge in any case. Compression: In this stroke, both valves are closed and the piston moves upward reducing the combustion chamber volume which reaches its minimum when the piston is at TDC.

The piston performs work on the charge as it is being compressed; as a result its pressure, temperature and density increase; an approximation to this behavior is provided by the ideal gas law.

Just before the piston reaches TDC, ignition begins.

In the case of a SI engine, the spark plug receives a high voltage pulse that generates the spark which gives it its name and ignites the charge.

In the case of a CI engine the fuel injector quickly injects fuel into the combustion chamber as a spray; the fuel ignites due to the high temperature. Power or working stroke: The pressure of the combustion gases pushes the piston downward, generating more work than it required to compress the charge.

Complementary to the compression stroke, the combustion gases expand and as a result their temperature, pressure and density decreases.

When the piston is near to BDC the exhaust valve opens.
The combustion gases expand irreversibly due to the leftover pressure?in excess of back pressure, the gauge pressure on the exhaust port?; this is called the blowdown. Exhaust: The exhaust valve remains open while the piston moves upward expelling the combustion gases.

For naturally aspirated engines a small part of the combustion gases may remain in the cylinder during normal operation because the piston does not close the combustion chamber completely; these gases dissolve in the next charge.

At the end of this stroke, the exhaust valve closes, the intake valve opens, and the sequence repeats in the next cycle. The intake valve may open before the exhaust valve closes to allow better scavenging. Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine

Big end bearings

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Lubrication Diagram of an engine using pressurized lubrication Wikimedia Commons has media related to Internal combustion piston engine lubrication systems. Surfaces in contact and relative motion to other surfaces require lubrication to reduce wear, noise and increase efficiency by reducing the power wasting in overcoming friction, or to make the mechanism work at all.
At the very least, an engine requires lubrication in the following parts: Between pistons and cylinders Small bearings Big end bearings Main bearings Valve gear (The following elements may not be present): Tappets Rocker arms Pushrods Timing chain or gears. Toothed belts do not require lubrication. 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..

Widok do druku:

oil for Jeep