🔍 Key Concepts

• Look closely at the shape of the cylinder head surface (fire-deck) above the piston — is it flat or curved like part of a sphere? • Identify whether there is a separate small chamber in the cylinder head connected by a narrow passage to the main cylinder (pre‑combustion/turbulence) or if all combustion space is directly over the piston (open chamber). • Notice the location of the fuel injector and valves and how the combustion space is formed around them.

💭 Think About

• From the illustration, does the combustion space appear entirely within the main cylinder over the piston, or can you see an extra small chamber off to the side or above? • If there were a pre‑combustion or turbulence chamber, what distinctive small rounded pocket and connecting throat would you expect to see in the head section? Do you see that here? • When you trace the outline of the metal surface forming the top of the chamber (the head side), does it look essentially flat, or is it clearly dome/hemisphere‑shaped?

✅ Before You Answer

• Confirm whether there is any separate small chamber in the head; if not, eliminate the pre‑combustion and turbulence chamber options. • Decide if the fire-deck profile in the drawing is flat or hemispherical by following its cross‑section line carefully. • Match what you see to the correct wording: open type combustion chamber (no secondary chamber) versus pre‑combustion/turbulence chambers (have a distinct small chamber and throat).