Exam 17: Engine Breathing: Intake and Exhaust Systems

Multiple coil springs are often used with high lift cams to prevent coil spring _________.

Technician A says that there is no contact between the center root of the valve locks/keepers and the groove in the valve stem. Technician B says the keepers are clamped tightly to the stem of the valve. Who is right?

Which manifold can have tighter bends and bigger runners, port or wet?

Cylinder heads are being discussed. Technician A says porting is when the size of a passageway is altered. Technician B says polishing smoothes the surface of the port. Who is right?

Which valve seat angle results in a larger gap between the valve face and seat, 30° or 45° angle?

When higher tension valve springs are used in a high-performance engine, this is inefficient and uses horsepower. True or False?

Which of the following is/are true about valve springs that have too much pressure when the valve is open?

A straight through muffler has short pipes and baffles that cause the exhaust gases to move back and forth as they travel through the muffler.

Which of the following can cause an exhaust manifold to run red hot?

When intake and exhaust manifolds are on opposite sides of an in-line engine cylinder head, what is this design called?

What is the purpose of a catalytic converter?

What is the name of the type of fuel injection system that injects fuel directly above the intake valve?

When intake runners are designed to trap standing waves in the manifold, timing them so they are ready to be breathed when the intake valves open, this is called a _________ manifold.

When a single manifold runner feeds two neighboring cylinders, these are known as _____________ ports.

Which of the following are recommended additions when installing a high lift cam?

What is installed under valve springs on an aluminum head?

On an engine with a two-barrel intake manifold, if each barrel supplies fuel to four cylinders, what is this manifold design called?

Two technicians are discussing service after a catastrophic engine failure. Technician A says replacement of the intake manifold is recommended by some manufacturers. Technician B says metal parts can be coughed up into the runners of the intake manifold where they can remain even after cleaning. Who is right?

Which of the following is/are true about titanium valves?

Newer engines with port fuel injection (PFI) require intake manifold heating.