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Diesels and detonation
It's a common misconseption that there's detonation in a properly tuned diesel engine. Actually the fuel burns as it is injected into the cylinders. There is a small delay after the injection first starts and this is what makes the typical "diesel knock" you hear. The better your cetane number the less knock. The
low and varying cetane numbers and generally low quality of US diesel fuel is a big reason why it is difficult for manufacturers to introduce modern diesels to the USA.
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