Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

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0.37569444444444
0.62569444444444
0.75069444444444

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

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

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