During the compression stroke in a...

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Question 1 of 205eccefa1bacbc34ba4d47433

During the compression stroke in a four-stroke/cycle, internal combustion engine, assume that the piston can only travel seven-eighths of the total distance between BDC to the underside of the cylinder head. Which of the following ratios will be the compression ratio for this engine?

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🔍 Key Concepts

• Compression ratio definition in a four-stroke engine • Relationship between total cylinder volume (swept + clearance) and clearance volume • Effect of piston only moving 7/8 of the stroke on the remaining volume above the piston

💭 Think About

• What is the volume above the piston when it is at BDC compared to when it is at TDC in this special case? • If the piston only travels 7/8 of the way up, what fraction of the original stroke volume remains uncompressed as extra clearance? • How do you express compression ratio as (total volume : clearance volume) using these fractions?

✅ Before You Answer

• Be clear on the difference between swept volume (stroke volume) and clearance volume (space above piston at TDC) • Make sure you account for the extra 1/8 of stroke volume that never gets compressed • Confirm that the final ratio is expressed as (total cylinder volume at BDC) : (volume at TDC) before matching it to the closest answer choice

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