Mechanical Engineering - IC Engines and Nuclear Power Plants - Discussion
Discussion Forum : IC Engines and Nuclear Power Plants - Section 1 (Q.No. 7)
7.
The exhaust valve in a four stroke cycle petrol engine
Discussion:
17 comments Page 1 of 2.
Ram said:
1 decade ago
Can anyone explain this?
Viswa said:
1 decade ago
In valve timing diagram any valve open always before either bdc or tdc.
SIT said:
1 decade ago
Valve timing diagram: opening of valves are before and after dead centers.
J bhargavi baaji said:
1 decade ago
Here the angle doesn't matters. As per the value timing diagram, value open before the the cycle starts and closes after the cycle. As per the question, the value opens before the exhaust process ie before the BDC and closes after TDC.
Rakesh said:
1 decade ago
Can anyone explain the total diagram?
Sugumaran said:
1 decade ago
What @J bhargavi baaji told above is absolutely right.
Sangangouda patil said:
1 decade ago
In valve timing diagram it is a 4 stroke called exhaust stroke hence exhaust valve opens before BDC at 50 and closes after TDC 15.
Ashish said:
1 decade ago
Exhaust valve opens before 50 degree of BDC and remains open even after completion of exhaust stroke after 20 degree TDC so that it ensures complete removal of flue gaseous from cylinder.
Hence it avoids deterioration of fresh incoming charge during suction stroke which may mix with these burnt gaseous. This time lag of opening and closing of valve is essential during high speed as less time is available for flue gaseous to be thrown away.
Hence it avoids deterioration of fresh incoming charge during suction stroke which may mix with these burnt gaseous. This time lag of opening and closing of valve is essential during high speed as less time is available for flue gaseous to be thrown away.
Mahendra bitake said:
9 years ago
It opens before BDC at 20degree & closes after TDC at 10 degree.
Narayan said:
9 years ago
The exhaust valve is kept open for such prolonged duration in order to let the products of combustion escape from combustion cylinder. This setting is different for light and heavy engines and may also differs with different automakers.
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