Quote:
Originally Posted by ConnClark
An important thing to note on nozzles for OM616 and OM617 is that the central hole in the pintle provides a pilot injection. This helps reduce soot and improve power. Over the years Mercedes enlarged the central hole and increased power. If the replacement nozzles don't have this hole you aren't going to get out as much power as you can with correct nozzles.
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I have my own theory. I believe they increased the size of the drilled hole because the smaller holes were plugging up too soon. The newer nozzles have a Facet (flat spot) on the side of the Pintel that serves the same function (as do Monark Nozzles) and is less pron to carbon buildup.