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When does maximun valve overlap occur?

Updated: 9/17/2019
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Q: When does maximun valve overlap occur?
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When the intake and exhaust valves are both open at the same time that length of time is called?

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What does a overlap valve do?

send a small amount of raw fuel/air to the catalytic convertor,which increases the efficiency of the operating engine.


What are the disadvantages to have a large valve overlap?

High end Rpm output tails sooner, engines idle is lumpy, emissions are higher, too much overlap can cause rough low rpm driving, more chance of detonation.