A diesel engine cylinder has a swept volume of 125 cubic inches and a compression ratio of 13.5 to 1. What is the clearance volume in the cylinder at top dead center?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 10 cubic inches
Clearance volume equals swept volume divided by compression ratio minus one. For a 125 cubic inch displacement and a 13.5:1 ratio, total volume is 135 cubic inches, resulting in a 10 cubic inch clearance volume.
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