4.5.6.b Ignition timing
How can one change valve timing? — Rotate the camshaft relative to the crankshaft, thereby changing the valve opening moments. We add to this the ignition advance control*, which made it possible to control the start and end of engine strokes and allowed the internal combustion engine to be improved so much that the power and fuel consumption indicators improved many times over.
Note
* Ignition timing. In order for the air-fuel mixture to have time to burn while the piston moves from top dead center to bottom, it shall be ignited a little earlier. The main indicator is the ignition timing, which indicates how many degrees before TDC there will be a breakdown between the spark plug electrodes on the compression stroke. Depending on the crankshaft speed and engine load, the ignition timing must change. This can be done using an ignition distributor or an electronic engine control unit (for more information, see chapter 10 "Electrical Equipment and Electrical Systems", section 10.3 "Ignition System").
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