Discussion
Theoretically the inlet valve should open at what position of the piston?
Answer: A
Theoretically the inlet valve opens at Top Dead Centre (TDC).
On the theoretical valve timing diagram of a four stroke engine, the suction stroke runs from top dead centre to bottom dead centre, so the inlet valve opens at TDC and closes at BDC. In actual engines it opens a little before TDC to make use of the inertia of the gases.
BDC is where the inlet valve closes theoretically, and 'side centre position' and 'bottom side position' are not standard piston positions.
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