Exhaust Exhaust Manifolds & Headers 2

Question 1

What is 'exhaust scavenging'?

Accepted Answer

Using exhaust pulse energy to help draw fresh gases into the cylinder

Answer

Filtering pollutants from exhaust gases

Answer

Removing carbon deposits from the manifold

Answer

Testing exhaust flow with a vacuum gauge

Question 2

Which type of header is best suited for maximizing low-end torque in street performance applications?

Accepted Answer

Shorty headers

Answer

Long-tube headers

Answer

Equal-length tri-y headers

Answer

Lakepipe headers

Question 3

What sealing component is placed between the exhaust manifold and the cylinder head?

Accepted Answer

Exhaust manifold gasket

Answer

Valve stem seal

Answer

Head gasket

Answer

Throttle body gasket

Question 4

What symptom commonly indicates an exhaust manifold leak?

Accepted Answer

Ticking or popping sound from the engine bay that diminishes as the engine warms up

Answer

Rough idle only when warm

Answer

Black smoke from the tailpipe

Answer

Loss of power steering assist

Question 5

What is the purpose of ceramic or thermal coating applied to exhaust manifolds?

Accepted Answer

To retain exhaust heat inside the pipes, improving flow velocity and reducing under-hood temperatures

Answer

To prevent corrosion only

Answer

To dampen exhaust noise

Answer

To meet emissions requirements

Question 6

What is a 'collector' in the context of performance exhaust headers?

Accepted Answer

The section where individual primary tubes merge into a single outlet

Answer

The gasket that seals the header to the head

Answer

The clamp joining the header to the downpipe

Answer

The oxygen sensor bung