What are TDC and BDC, and how do you understand them?

Question

Accepted Answer

TDC stands for Top Dead Center and BDC stands for Bottom Dead Center. They are reference points in the rotation of an engine's crankshaft.

TDC is the point where the piston is at its highest position in the cylinder during the compression stroke.
BDC is the point where the piston is at its lowest position in the cylinder during the exhaust stroke.
Understanding TDC and BDC is crucial for timing engine components such as valves and ignition.
TDC and BDC are used to determine the position of the piston and the timing of various engine processes.
For example, when setting the timing of a car engine, the crankshaft is rotated to TDC to adjust the ignition timing accurately.

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