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Message: <blockquote data-quote="PabloIceman" data-source="post: 3836616" data-attributes="member: 27799">EZ, that phenomena is called "Diesel knock" .. it's called Diesel Knock becos when original engines were made, the ran on diesel ...It's becos the 'detonation' of the fuel produces less power to the engine.Diesel fuel is intended to ignite instantly upon injection; the measure of this property is the cetane rating. Gasoline is intended to resist ignition until the spark plug fires; the measure of this property is octane. In either type of engine, uncontrolled ignition with multiple flame fronts causes engine damage/knocking. In the case of diesel, if the fuel doesn't ignite upon injection, a pocket of fuel is formed that later ignites due to the pressure rise caused by the main burn. The results are the same as gasoline igniting from the pressure rise before the main burn spreads to it. The multiple flame fronts collide violently, you hear a knocking sound and the engine is subjected to enormous forces that cause piston, ring, valve and connecting rod damage. The weakest component breaks first.Last 2 sentences are important.</blockquote>

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