carters cylindres à large diffusion

French to English Tech/Engineering Automotive / Cars & Trucks engines

Still on my car engine text...

In a discussion of the various assembly lines, it statates:

Pour la première fois pour les carters cylindres à large diffusion, des centres d'usinage sont utilisés.

I'm not sure whether these are a specific type of crankcase, or whether it means they are for largescale distribution.

Any thoughts would be very welcome as ever!