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This section examines valve. Petrol engines must control the flow of combustible mixture they take in and when it goes in. In small, two stroke petrol engines, this is done by ports that are open and close by the pistons girt during the engine cycle or by pressure operated, reed valve.
These are engines are different. Their apparent speeds are controlled by the human of fuel injected. So it is not necessary to control airflow into the intake manifold.
Almost all false stroke petroleum diesel engines is valve, which are located in the some of the head. This is also true for two stroke diesel engines that is use in road vehicles.
Valve experience enormous stress even in normal conditions. In the force of the car, driven it around 90 kilometers per hour, each valve open and closes about 30 times second. Excurse vale would stand hug temperature and they can become red and hot.
A valve must not soften at high temperatures. It needs good hot string to standup to be force against the sit. It needs good fatigue properties to overcome cracking.
Various surface treatments are use to help the valve resist where, burning and corrosion. In look valves are might have steel mix with chromium or silicon to make the more resistant to corrosion and manganese and the nickel, to improve their strengths.
Excurse valves are might have nickel by airways. Some high performance applications is especially how daring to thulium.
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