Looking at D-16 Volvo engine

I think Holset is part of Cummins, they took over some time ago.
If so, I'm sure they won't sell their best solutions to competitors.
The same way F-18 fighter jets sold abroad are not exactly the same with the F-18 US Air Force is using

 

engines with rear gear train runs smoother,ISX is the last mogikan

 

16 liter was never a great engine but the 12 and 13 liter engines are very good, don't know why that is but it's been the case since I was a kid

 

The reason the engines come with a rear gear train is to allow the truck manufacturer to have a lower hood profile.

 

Now that's something I never thought of

 

It is to get less crankshaft flex because gear train is close to flywheel.

 

My friend has driven the 670 with both the D12 and Cuminns ISX. He prefers the ISX as it is more powerful. He described the D12 as weak engine.

KH