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TURBOCHARGERS

It is becoming hard to come across a diesel that is not using a turbocharger. It can be difficult to figure out what turbocharger is right for your needs and vehicle. At Diesel Injection Service, we have an experienced staff that is able to answer any of your questions ranging from what turbocharger is best for you, to the differences between the dealers.

 

We stock a large range of turbochargers from the leading brands. If you need it, we will be sure to find it for you here at Diesel Injection Service.

Turbo is our middle name and we show it with products from Cummins®, KKK®, Holset Turbochargers®, Caterpillar®, Schwitzer®, Garrett®, Borg Warner Turbo Systems® and Detroit Diesel®.

How a Turbo System Works

Engine power is proportional to the amount of air and fuel that can get into the cylinders. All things being equal, larger engines flow more air and as such will produce more power. If we want our small engine to perform like a big engine, or simply make our bigger engine produce more power, our ultimate objective is to draw more air into the cylinder. By installing a turbocharger, the power and performance of an engine can be dramatically increased.

So how does a turbocharger get more air into the engine? Let us first look at the schematic below:

1 Compressor Inlet 
2 Compressor Discharge 
3 Charge air cooler (CAC) 
4 Intake Valve 
5 Exhaust Valve 
6 Turbine Inlet 
7 Turbine Discharge

The components that make up a typical turbocharger system are:

  • The air filter (not shown) through which ambient air passes before entering the compressor (1)

  • The air is then compressed which raises the air’s density (mass / unit volume) (2)

  • Many turbocharged engines have a charge air cooler (aka intercooler) (3) that cools the compressed air to further increase its density and to increase resistance to detonation

  • After passing through the intake manifold (4), the air enters the engine’s cylinders, which contain a fixed volume. Since the air is at elevated density, each cylinder can draw in an increased mass flow rate of air. Higher air mass flow rate allows a higher fuel flow rate (with similar air/fuel ratio). Combusting more fuel results in more power being produced for a given size or displacement

  • After the fuel is burned in the cylinder it is exhausted during the cylinder’s exhaust stroke in to the exhaust manifold (5)

  • The high temperature gas then continues on to the turbine (6). The turbine creates backpressure on the engine which means engine exhaust pressure is higher than atmospheric pressure

  • A pressure and temperature drop occurs (expansion) across the turbine (7), which harnesses the exhaust gas’ energy to provide the power necessary to drive the compressor

1 Ball Bearings (support and control the rotating group)
2 Oil Inlet
3 Turbine Housing (collects exhaust gases from the engine and directs it to the turbine wheel 
4Turbine Wheel (converts exhaust energy into shaft power to drive the compressor)
5 Center Housing (supports the rotating group)
6 Oil Outlet
7 Compressor Housing (collects compressed air and directs it to the engine)
8 Compressor Wheel (pumps air into the engine)
9 Backplate (supports the compressor housing provides aero surface)

© Copyright Honeywell International Inc 2017

https://www.turbobygarrett.com/turbobygarrett/basic

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