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How the exhaust valve early or late openning affects the engine operation?

29 Sep '19, 11:37

Sept. 29, 2019, 11:37 a.m.
KnowledgeBase's gravatar image


incorrect exhaust valve timing

Early opening of the exhaust valve leads to:

  • Higher exhaust temperature of the unit due to opening the valve while fuel still burns
  • Fouling of the exhaust gas system by carbon deposits from partially burnt fuel
  • Reduction of engine power and efficiency

Late opening causes:

  • Reduced time of scavenging and hence, its efficiency
  • Reduced turbocharger efficiency
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29 Sep '19, 11:58

Sept. 29, 2019, 11:58 a.m.
cheng's gravatar image

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