Exam 17: Engine Breathing: Intake and Exhaust Systems

Technician A says high rpm performance can mean poor low rpm performance. Technician B says purchasing just a high performance manifold without matching components will probably hurt performance. Who is correct?

Technician A says that when valve lift reaches 25% of the port opening, maximum airflow is achieved. Technician B says the more a spring is compressed to lift a valve, the more pressure it exerts resulting in increased reliability. Who is right?

Racing engines that operate at speeds above 14,000 rpm often use pneumatic valve closing mechanisms.

Resonance tuning is based on the __________ Resonance Theory.

When a port has been designed for a particular engine, it remains in the computer's memory and can be duplicated using a ____ on future sets of heads.

Which of the following is/are true about cylinder head porting?

Exhaust manifolds are often made of ____ because of its ability to tolerate fast, severe temperature changes.

On racing engines, airflow though intake and exhaust passages is tested on a ________ bench.

What is the name of the air space in the manifold below a carburetor or throttle body?

Hemispherical combustion chambers restrict airflow because of shrouding.

As each valve opens and compresses its valve spring, another valve is closing, decreasing pressure as its spring re-extends. This is known as the ____ characteristic.

Stainless steel headers have a shorter life expectancy than cast iron exhaust manifolds. True or False?

What is plenum?

What is the meaning of the term, red line?

Exhaust manifolds made of steel tubing are called _____________.

Technician A says press bending reduces the diameter of tubing. Technician B says a mandrel bender prevents changes in a tube's diameter during the bend. Who is correct?

Today's springs are designed with a __________ frequency beyond the normal operating range of the engine.

The amount of intake and exhaust that flows through manifold runners is measured in _________.

What are the three styles of exhaust systems?

Technician A says restrictor plate racing involves blocking off some of the exhaust ports. Technician B says manifolds that flow air only can have sharper bends than those that flow air and fuel. Who is correct?