1.Why the engine can provide power continuously?

1.1-The intake stroke

1.2-The compression stroke

1.3-The power stroke

1.4-The exhaust stroke

2.The Engine power comes from explosion

3.Spark plugs are "detonation" masters

If you want the "explosion" in the cylinder to be more powerful, timely ignition is very important, and the spark plug in the cylinder plays the role of "detonation". In fact, the principle of spark plug ignition is a bit similar to lightning. The spark plug head has a central electrode and a side electrode (equivalent to two clouds of ions with opposite polarity). There is a very small gap between the two electrodes (called the ignition gap). When powered on, it can generate an electric spark of more than 10,000 volts, which can instantly "detonate" the mixed gas in the cylinder.

4.The intake valve should be larger than the exhaust valve

5.The number of valves should not be too many

If the engine has multiple valves, the intake volume is large and the exhaust is clean at high speed, and the engine performance is also better (similar to a movie theater, if there are many doors, it is much more convenient to get in and out). However, the multi-valve design is more complicated, especially the valve drive method, combustion chamber structure and spark plug position all need to be precisely arranged, so the production process requirements are high, the manufacturing cost is naturally high, and the later maintenance is also difficult. Therefore, the number of valves should not be too many. Common engines have 4 valves per cylinder (2 inlet and 2 outlet).