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There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap.
This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.
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What is meant by the term power overlap?
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What does the term valve overlap mean?
Valve timing overlap is the time when both exhaust and intake valves are open most engines with catalytic converters require valve overlap in order to send a small amount of raw fuel/ air mix to the converter's. An "open cam" has valve overlap a "closed" cam does not
What are some synonyms of the term 'overlap'?
Some synonyms of the term overlap are extend along and fold over. The word overlap is defined as to lie over something else or the winged or extended part of an object.
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It improves the efficiency of the engine by allowing better exhaust out flow and intake in flow.
When the intake and exhaust valves are both open at the same time that length of time is called?
Valve overlap.
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What is valve overlap?
Valve overlap occurs in a four-stroke engine at the end of the Exhaust stroke and at the beginning of the Induction stroke; and is when both the exhaust and inlet valves are open at the same time. At the end of the Exhaust stroke, the Exhaust valve is closing and the Inlet valve is starting to open in preparation for the induction of fuel and air into the cylinder. It is common knowledge that in vehicles that cannot alter the valve timing, the Inlet valve opens approx 6 degrees before top-dead-centre and the Exhaust valve closes at 9 degrees after top-dead-centre
