In actual 4 stroke engine cycle, combustion chamber pressure at the end of exhaust stroke is greater than the atmospheric pressure and the pressure of the intake port on average is less than the atmospheric pressure. In theory, early opening of the intake valve before the TDC should not result with fresh air getting inside the combustion chamber. However in actual applications, intake valve is opened 20 ~ 40 ᵒ CA before the TDC (Intake valve opening advance), in order to increase the fresh air transfer into the combustion chamber. Explain how intake valve opening advance increases fresh air transfer into the combustion chamber.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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In actual 4 stroke engine cycle, combustion chamber pressure at the end of exhaust
stroke is greater than the atmospheric pressure and the pressure of the intake port on
average is less than the atmospheric pressure. In theory, early opening of the intake
valve before the TDC should not result with fresh air getting inside the combustion
chamber. However in actual applications,
intake valve is opened 20 ~ 40 ᵒ CA before
the TDC (Intake valve opening advance), in
order to increase the fresh air transfer into
the combustion chamber. Explain how
intake valve opening advance increases
fresh air transfer into the combustion
chamber.

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