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

It makes petrol engines lighter
Less compression ratio gives better performance
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

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Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Enable the pump's fault diagnosis function to operate
Warm up and lubricate the pump
Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion
Ignition induced by the passage of a spark
Ignition of the charge before the passage of flame front
Automatic ignition of the charge at the end of compression

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