Turbochargers

http://www.youtube.com/watch?v=vGhlgphrBxA&feature=related

Turbocharger

• Is an engine component that improves engine performance through the introduction of additional air into the intake system

• Turbochargers utilize volume, intensity, and speed of existing exhaust gases from a running engine to drive a compressor.

• http://www.thesaabsite.com/About%20Saab%20turbos.htm

Diesel Engine Turbocharging

• Uses a compressor to raise the pressure and the density of the air entering an engine.

• An exhaust-driven turbine drives a small compressor on the same shaft to pressurize the intake air. This increases the total mass of air introduced per cycle.

The increased air mass

• Increases the power output.

• Improves fuel economy.

• Can reduce overall emissions.

Turbochargers

• Must operate at high temperatures and high rotational speeds for maximum benefit.

• Turbo Lag occurs!!– Period of time between when the operator

demands more power and the time when the intake air reaches maximum pressure for the desired power.

Parts of a Turbocharger

• Turbine• Turbine housing • Central rotating shaft• Turbocharger compressor wheel• Turbocharger compressor housing • Wastegate

Turbine

• Provides a turbocharger with the needed rotational force to compress ambient air to a positive pressure.

Turbine Housing

• Component that channels exhaust gases existing the engine to the turbine for maximum rotational effect.

Central Rotating Shaft

• Supports the two main parts of a turbocharger.

• The turbine is connected to and rotates with the central rotating shaft.

Turbocharger Compressor Wheel

• Component that takes in ambient air and pressurizes it to a value above 14.7 psi.

• When the turbine rotates, so does the turbocharger compressor wheel.

Turbocharger Compressor Housing

• Used to compress ambient air and direct it into an intake stream of an engine above ambient pressure.

Questions

1. Define Turbo Boost.2. Is there a limit on how much turbo boost an

engine can safely & efficiently utilize?3. Define the concept of Knocking associated

with too much Boost pressure.4. Define Turbo Lag.5. How does Internal & External Wastegates

work?