This explains the existence of pre chambers in diesels, and also of the significance of the pilot injection feature (which is what VW pioneered, with Bosch's help, for their TDI motors.)
Maybe someone up here who has a toyota diesel could look underneath their head sometime and see if this is the kind of piston it has. (Feel free to take some detailed pictures and measurements. ) And IDI VW Diesel piston is pictured by the way at left in the bottom row.
Interesting that, despite the piston cut, the Toyota diesel is a pretty low-revver--it's capped at 4000 rpm. However, it is a substantially larger engine; maybe with the right mods, that method could be used to great advantage in a VW diesel.
Nice!! Thanks for your contribution, 2446
Can you add the width and length, as well?
Quote from: "VWRacer" Can you add the width and length, as well?The first cut starts at 16mm wide and finishes at 15mm, and is approx. 24mm long. The second cut starts goes from 14 to 13mm wide, is 21mm long. The relative positions you can measure on the picture with the provided scale The beginning part of the first cut curves somewhat roundly just like in fig. 6 in the patent document.