EGR ?

[mikkhh]

Ideas is good, but what about the pressure before turbo VS pressure after DPF?

https://www.ms-motorservice.com/int/en/t...irculation

Merc is using low pressure egr, stepped bowl steel pistons on their latest OM654 and 656 passenger car/van engines.

https://group.mercedes-benz.com/innovati...m-654.html
https://group.mercedes-benz.com/innovati...656-2.html

And there are like 100 page long texts about them if you search:
introduction of the inline engine generation OM654 / OM656

BUT what makes me surprised is that WHY crankshafts are missing some of those counterweights? I can not think of any good reason why besides minuscule efficiency gains, but with the tradeoff or reduced reliability and curved crankshafts. The same counterweight optimization story is evident on 2010+ era cars (BMW N47 N57, B47, B57) AND even on some commercial engines - for example Ford Ecotorq.

https://www.researchgate.net/publication...ne_ECOTORQ

On Ford the 8 counterweights on inline6 crank started on year 2004.

https://www.fordotosan.com.tr/en/operati...ine-family
Even the latest ecotorq engines have same style crankshaft and that egr cooler is nicely hidden to make regular cleaning even harder.

For some reason that official website has taken down those introduction videos, but if search for Ford ecotorq Euro6 Ford trucks then there is lots of videos to find.