Posted: 08 Oct 2010 10:47 AM PDT

As experts say that are professionally engaged in turbo charging systems resource of turbocharger is no less than the engine which it is installed on. However, the turbine often needs to be repaired much sooner than the engine require overhaul.

The reasons because of which the turbocharger failures prematurely are several, but the most common – are bad-quality lubricant. Up to 80% of repair cases are connected with this problem. The rotor of turbocharger in some modes of operation has to rotate in their bearings at speeds of over 100 thousand rpm. Therefore, it is difficult to find a new aggregate that needs an effective lubrication more than turbine. For comparison: speed of the crankshaft in gasoline engines is typically less than 8 thousand rpm, but diesels – and 4,5 thousand rpm.

Cooling.

Even in the designs with a supply of liquid from the engine oil cooling system it is necessary to cool the bearing assembly of turbocharger. And I must say that the turbocharger is heated with exhaust gases passing through its turbine part to temperatures of 650 – 700 C in diesel engines and over 1000 for gasoline engines.

Finally, a layer of oil in the bearing bushings should damp the rotor. The fact is that the exhaust gases do not pass through a turbine of a continuous stream, and hit the shoulders of the turbine wheel by impulses in accordance with the opening and closing of exhaust valves in the engine cylinders. The oil layer dampens oscillations of the rotor arising from these attacks.

Troubles with oil.

What happens if a badly clarified butter goes into the bearing assembly? Or in the engine it is filled the oil with initially low quality, inconsistent with the requirements set forth in the manufacturer’s operating instructions of turbo motor? Or the oil is supplied in the insufficient quantity and under low pressure?

Bushes and rotor wear, and there are backlash and clearances unacceptable for the normal work of the assembly. The oil is squeezed out rapidly from increasing gaps; in the bearings medium-dry friction starts, and plus – nothing damps more the rotor shaft. Semi-dry friction – it is not only wear, but additional heating. The oil of low quality at high temperatures quickly loses its lubricating properties; coke products of thermal decomposition hit the sealing rings, causing them to wear. This list can be continued.

What to do?

It’s time to give the first advices to owners of cars with turbocharged engines. In order not to ruin the turbine prematurely, it is necessary to serve the engine lubrication system at least every 7 – 7, 5 thousand kilometers. The quality of the filling oil should not be lower than the recommended by factory instructions. Preference is given to the most serious brands. The same applies to the oil filter purchased to replace.

Until the engine is warmed up to the operating temperature, oil is too viscous. The lower the temperature, the worse the oil enters the bearing assembly, and till full heating of the engine, it is necessary to avoid abrupt dispersals of the car and drive to the forced modes. Otherwise, it is possible delays with the filing of oil, and bearings are in oil starvation and semi-dry friction.

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Turbochargers With Variable Geometry.

Posted: 08 Oct 2010 10:46 AM PDT

VTG (Variable Turbo Geometry) – is a turbocharger with variable geometry. The engineers always wanted to create turbochargers with rotary impellers, but such a mechanism is difficult to implement. It is easier to make movable a guide vane, which would regulate the amount of incoming exhaust gases.

In the late 80′s in the rotary engine Mazda RX7 it was used the simplest mechanism VTG. The jet of exhaust gases was divided into two streams. At low speeds they affect only the upper part of the turbine wheel. When the speed reaches a certain level, the valve is opened and the exhaust gases have impacted on the entire surface of the turbine. Unfortunately, this system worked well only with rotary piston Wankel engine.

More successful was the idea with several vanes, enshrined in a special holder. They adjusted the speed and pressure of the flow of exhaust gases, depending on the mode of operation. In the truck it was first successfully applied this method by company Mitsubishi in the mid 80s, and in cars – Audi and Volkswagen in 1995. Later passenger diesels BMW and Mercedes Benz have got VTG turbochargers, as well as Alfa Romeo.

But, unfortunately, this system has taken root only in diesel engines. The fact is that the gentle guiding device loses mobility after a long work at high temperature of exhaust gases. Compare 1050 ° C for gasoline engine and only 600 ° C for diesel one. In addition, the turbine with variable geometry is more expensive than usual. And its reliability and durability is less. Therefore, in the near future the question of what an ideal turbocharger should be remains open. One of the promising ways – is the use of combined supercharging. For example, at low speed the drive compressor pumps air into the cylinders, and already at average speed the turbocharger starts working.

How to save life of turbocharger?

This is simple. It is only necessary to comply with the recommendations of the car manufacturers. According to data of one major research firm, only about 30% of the owners of “turbo” cars perform these recommendations. The problems with turbocharger arise mainly as a result of neglect of these rules. They are as follows:

1. After the cold start, do not switch on high turnovers at least 5 minutes, so that the oil will lubricate the turbocharger well.

2. Before switching off the engine after a large load or a long trip, leave it to work no less than a minute at idle. If you immediately stop the engine, the turbocharger will make turns without lubrication for some time because the oil pump stops working. As a result, the bearings and rings of the unit are damaged.

3. Do not forget to change systematically the engine oil and oil filter. Remember that high temperature arising in the work of the turbocharger lowers the efficiency and durability of the oil. So fill only the oil that is suitable for “turbo” engines.

Adhering to these rules, you will ensure long and reliable operation of the turbocharger. Remember the “golden” rule: the disease is easier to prevent than to cure.

Long time ago automobile changed into not only a vehicle but also a luxury and entertainment object. Many car owners would like to have high-powered sport car but not everybody can afford it. There is a way out – turbo kits. Those who want to know how to turn their car into a real masterpiece, go to this site. Lots of info about performance parts and how to buy them.

Even if you fail to find things you need, don’t get disappointed. These days we have a really unique chance to choose exactly what you require at the best terms which are available on the market. All that we need is the online technologies. Use search engines, look for “car performance parts“, review blogs, social networks and forums. All this will help you get lots of various information. And also subscribe to the RSS feed on this blog and you will always keep abreast.