has to due with lag timing on the fuel burn.. more lag more fuel ignites sending a larger pressure wave towards the piston making the 'knock sound'
Reason Most diesels dont spin high is due to the Massive parts involved. Take a look at the common diesel engines, and their beefy compenents...
Detonation is an uncontrolled expostion of the air fuel mixture, this does not happen in a diesel as there is no fuel to burn as the air is compressed. The Fuel is injected directly into the cylinder at or near tdc and burned from the heat of the compression. There is no uncontrolled expoition...
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