Question 1 of 20
Q
The main function of piston compression rings is to __________.
A
prevent excessive cylinder liner wear
B
reduce friction losses in the engine
C
seal the space between the piston and the liner
D
limit upward flow of lube oil into the combustion space
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Question 1 / 205eccefa1bacbc34ba4d47551
Question 1 of 205eccefa1bacbc34ba4d47551

The main function of piston compression rings is to __________.

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Question 1 of 20
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The main function of piston compression rings is to __________.

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🔍 Key Concepts

• Piston compression rings vs. oil control rings and what each type is designed to do • How combustion gas pressure interacts with the piston and cylinder liner • Why a tight gas seal is important for engine efficiency and safety

💭 Think About

• Ask yourself: What problem would occur if high‑pressure combustion gases could easily leak past the piston into the crankcase? • Which choice most directly relates to containing or controlling combustion pressure rather than lubrication or wear reduction? • Think about the name: "compression" ring. What part of the engine cycle is that referring to, and what must be maintained during that part?

✅ Before You Answer

• Identify which option directly describes sealing combustion pressure between piston and liner • Distinguish between gas sealing and lubricating oil control—they are related but not the same function • Eliminate any options that sound more like secondary benefits (side effects) rather than the primary design purpose of a compression ring

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