What is the primary function of the camshaft in a 4-stroke engine?

The camshaft controls the opening and closing of the intake and exhaust valves in sync with the pistons.

In what order do the four strokes of a 4-stroke gasoline engine occur?

Intake, Compression, Power (Combustion), Exhaust — often remembered as 'Suck, Squeeze, Bang, Blow.'

What does a higher compression ratio in a gasoline engine generally indicate?

A higher compression ratio means the air-fuel mixture is compressed more tightly, resulting in greater power output and efficiency, but requiring higher-octane fuel.

What is the role of the crankshaft in an internal combustion engine?

The crankshaft converts the up-and-down (reciprocating) motion of the pistons into rotational motion that drives the vehicle.

What is the function of the PCV (Positive Crankcase Ventilation) valve?

The PCV valve removes harmful blow-by gases from the crankcase and routes them back into the intake manifold to be burned, reducing emissions.

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ASVAB Auto & Shop Information

Master the Auto & Shop section of the ASVAB with these 28 targeted flashcards covering engine systems, electrical components, tools, and repair procedures. Designed to help military applicants achieve top scores by reinforcing the exact concepts tested on the exam.

28 cards Intermediate Engine Systems Fuel & Ignition Systems Electrical & Drivetrain Systems Shop Tools & Fasteners

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ASVAB Auto & Shop Information

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