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مکانیک::
سوپاپ خروجی
11- 44) and agglomeration is essentially complete well before the exhaust valve opens.
Spark plug and valves must be kept cool to avoid knock and preignition problems which result from overheated spark plug electrodes or exhaust valves.
Most critical is heat transfer from the hot exhaust valve and piston to mixture in the end-gas region.
When the exhaust valve opens, however, the blowdown process (Sec. 6.5) produces high velocities within the cylinder, and past the exhaust valve and in the exhaust port.
Substantial convective heat transfer occurs to the exhaust valve, exhaust port, and exhaust manifold during the exhaust process.
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