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Two revolutions complete one sequence of the four strokes. The burnt gases, due to their high pressure, virtually expel themselves, and the piston drives the last of the gases out; the exhaust valve closes at T. The stretching of the intake valve timing allowed the engine to breathe deeper and take in greater amounts of air and fuel, thus creating a more powerful explosion in the combustion chamber. Reviewing the intake valves' operation we see that its total opening period was 30° before T.
The camshaft is connected via the timing chain and sprockets at a 1:2 ratio to the crankshaft and therefore revolves once for every two turns of the crank. An important advantage gained from lengthened valve timing is that the greatly expanded gases are eliminated more efficiently and virtually by their own pressure. there would be a considerable loss in power at hi-speed since the intake charge having been in motion has built up kinetic energy and continues to flow filling the cylinder long after the piston changes direction.
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The engineers of the late 1800's were only concerned with harnessing power of the gasoline and air explosions in an internal combustion engine to propel an automobile, hopefully, a little faster than a horse. (Both intake and exhaust valves are slightly open at T. But much later, it was discovered that a mild scavenging effect was obtained from the overlap event when the exhaust actually pulled some of the intake charge in. The intake stroke continue as the piston moves downward, drawing the fuel/air mixture into the cylinder, reaches B.