What is the function of the inlet manifold?

• A. To route exhaust gases from the cylinders into the exhaust system.
• B. To cool the intake air.
• C. To deliver lubricating oil to moving parts.
• D. To duct fuel-air mixture from the carburetor, divide it, and deliver it via a series of pipes to each of the cylinders.

Answer: (D)

The inlet (intake) manifold is part of the engine’s induction system and its job is to take the air‑fuel mixture created by the carburetor and split it so each cylinder receives its own portion through individual runners. This distribution, often with a common plenum to smooth and equalize flow, helps ensure every cylinder gets a similar mixture for balanced, smooth combustion and consistent power.

Exhaust gases are handled by the exhaust manifold, not the intake. Cooling the intake air isn’t the manifold’s role, and lubrication is part of the engine’s separate oil system. The described function—ducting the fuel‑air mixture from the carburetor and delivering it to each cylinder through a network of pipes—exactly fits what the inlet manifold does.