Automobile Engineering in ME
In a square type engine

Two cylinders are placed horizontal and two vertical
Diameter and length of piston are same
Geometrical shape is square
Stroke length and cylinder bore are same

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance
It makes petrol engines lighter

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