Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

opens at 20° before T.D.C. and closes at 35° after B.D.C.
opens at T.D.C. and closes at B.D.C.
not listed here
opens at 10° after T.D.C. and closes at 20° before B.D.C.

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Leaving the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke

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