Engineering · Diesel — Combustion
The compression ratio of an engine is the ratio of the:
- AClearance volume to total cylinder volume
- BTotal cylinder volume to the clearance volume✓ Correct
- CBore to the stroke
- DIntake pressure to exhaust pressure
Explanation
Compression ratio = (swept volume + clearance volume) / clearance volume — total cylinder volume at BDC divided by the volume remaining at TDC.
Authority: Diesel Engines (USCG engineering topic)
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