Originally Posted by mAydAy

Twin charging on semi trucks is something you won't find anymore. The twin charged diesels were two strokes that required a blower for the intake of air because they had no intake stroke. Engines like the old Detroit Diesels are like this (x71, x53, x92 IE 6-71, 8v71 and 8-71 some of the common ones that used to be on the road). Emmissions has all but knocked these diesels out, you can still find them in boats and a few other places emmissions aren't as hard core.

-Andy