The Power Unit of an Engine; Most Cars Have 4 or 6

This page is the CodyCross answer for the clue below from The 80s, Group 800, Puzzle 4 (Quantum Leap).

Question is: The Power Unit of an Engine; Most Cars Have 4 or 6

and the answer is: CYLINDER

Word Meaning:

CYLINDER — (geometry) A surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve.

Definitions from Wiktionary.