ignition delay

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Ignition Delay aka ID (Abbreviation for Ignition Delay) is an concept in internal combustion engine that measures a lag between SOI and start of combustion process.

In TDi engines usual ignition delay is about 5° crankshaft angle at cruise speeds and partial load. In cold engine it could be 10° crankshaft angle or just 2.5° crankshaft angle at full load.

ECU compensates for various engine conditions.