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What causes a valve to “burn”?

Experience burn problems?

What causes a valve to burn in a normally aspirated engine? And what causes it to break, I mean losing a smal piece at the valve rim?

Burnt valve

Volvo Forum user byeboy writes “Well, it seems ant-climatic to go through such a journey of discomfort and discovery…only to find a tiny piece of exhaust valve #2 burnt off..but its enough to make my 850 idle poorly, but still run smooth and powerful at speed (although I know it’ll do better after surgery)…”

What causes a valve to “burn”?Picture of my Burnt Valve

Bonus! Volvo Facts

  • Volvo introduced both the two- and three-point safety belts. In 1959 an engineer by the name of Nils Bolin brought the three-point safety belt to fruition, effectively making Volvo the first auto-marque to offer these seat belts as standard spec on all of its cars. In 1960, Volvo also ensured that the dashboards on their vehicles were made of a softer type of plastic that would be easier on the human body in case of an accident.
  • Did you know that Volvo is also the father of Brake Assist, which offers extra braking power when having to brake very hard? This was known as ‘brake booster’, which was introduced by Volvo in 1965.

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1 Comment

Is it better to repair or new engine?

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