Combustion __; Engine Components That Burn Fuel

This page is the CodyCross answer for the clue below from Trip to Spain, Group 855, Puzzle 1 (Cobblestone Streets).

Question is: Combustion __; Engine Components That Burn Fuel

and the answer is: CHAMBERS

Word Meaning:

CHAMBERS — (archaic) A set of rooms in a building used as an office or a residential apartment.

Definitions from Wiktionary.