[allan5oh]

http://www.detroitdiesel.com/engines/dd15/

http://www.etrucker.com/apps/news/article.asp?id=64078

At the rated engine speed of the DD15, the turbine reaches a rotation speed of more than 40,000 rpm. Power is transferred to the gear drive, and therefore to the crankshaft, via a shaft and a hydrodynamic coupling. This arrangement produces a uniform and smooth crankshaft rotation despite the higher torque, according to the company; additionally, fuel consumption is reduced by up to 5 percent compared with a similarly spec'd Series 60.

http://www.detroitdiesel.com/pdf/eng...5-brochure.pdf

page 6, the sort of "half turbo" looking thing is the turbo compound unit. It directly attaches to the rear gear train.

[Hiway61]

I was wondering when engine manufacturer's would get around to capturing that last bit of power from the power plant.
The B-50C/D model bombers had compound engines fifty years ago.

[Doghouse]

When I took the engine cover off the inside of my truck,..there was a prototype of this system. 3 rat skeletons on the back of my engine,....guess it didn't work out too well for them :shock:

[no_worries]

I love how whenever a company is touting fuel savings they use the phrase "up to". Somehow, I doubt that the average user ever gets his savings "up to" that level.

[Bandit102]

A Detroit that'll pull at 1100 RPM? Boggles the mind.