Internal Combustion Engines
For the same compression ratio

Both Otto and Diesel cycles are, equally efficient
Otto cycle is more efficient than the Diesel
Compression ratio has nothing to do with efficiency
Diesel cycle is more efficient than Otto

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Internal Combustion Engines
Compression ratio of I.C. Engines is

Volume displaced by piston per stroke and clearance volume in cylinder
Ratio of pressure after compression and before compression
Swept volume/cylinder volume
The ratio of volumes of air in cylinder before compression stroke and after compression stroke

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