Fly ash generally contains about 5% to 6% Unburnt carbon.
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For years, the tale of the Unburnt painting was written off as a ghost story or a rumor.
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Protector of the Seven Kingdoms, the Mother of Dragons,
the Khaleesi of the Great Grass Sea, the Unburnt, the Breaker of Chains.
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A small efficiency loss is also avoided
compared to two-stroke non-direct-injection gasoline engines since Unburnt fuel is not present at valve overlap
and therefore no fuel goes directly from the intake/injection to the exhaust.