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it is less likely to ignite before it was planned (pre-igniton/knock/detonation)
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to explain this better for our less technically inclined.
When gas or diesel is ignited it travels on a front.. aka a line that slowly progresses along the area.
Preignition.. is when the gas not on that front(beyond it) ignites due to heat. (causing an uneven burn)
In a diesel engine.. the ignition is actually done by pressure and heat.. while gas is done with a spark.
The benefit obvious from diesel besides btu content is the efficiency at 0 due to the unrestricted airflow by the way.
Just clarifying.. you seem to be doing a good job of describing.