Hi Paul,

 Google this turbocompounding F1. Click on the choose the second post down call
Engine tech turbocompounding post.
 Then click on the lower right icon to expand it.

 Doug


I wonder if his professor knows about this :)

http://www.rotaryeng.net/Oxford-640-4802.wmv

My presentation on turbo compound presented at the 2008 World Motorsport Symposium in
Oxford UK.

Paul Lamar


I would like to point out some errors in the PDF.

"Turbocompounding was first used in the 1950s on aircraft engines.  The most
successful application was on the Wright R-3350, an 18- cylinder radial
engine with a displacement of 54.9 litres powering military aircraft, most
notably the Canadair CL-28, the Lockheed P2V-7 and the Fairchild C-119.  The
fuel mass flow into the engine translated into a 5,650 hp input of FIGURE 2
Mechanical turbocompound on a turbocharged engine which only 1,680 hp
resulted in engine power and a significant 2,915 hp or 51.6% was released
into the exhaust.  Exhaust energy recovery was therefore paramount and the
implementation of turbocompounding increased the engine output by 160 hp."

This is incorrect.  Probably a misinterpretation of the data I presented at the World
Motor Sport Symposium. Possibly the recovered HP from one of three turbines.

The max HP went from 2700 HP non turbo compound in 1946 to 3600 turbo compound in
1951. An increase of 900 HP or 33%.

The most significant turbo compounds truck engine was left out.

"The best examples are the Cummins and Scania engines that power many of the
freight FIGURE 3 Electric turbocompound on a turbocharged engine transport
trucks.  In these applications, the aim is to reach a certain power output
at a lower rpm and hence reduce fuel consumption.  The first successful
application was on the Cummins NTC-400, a turbocharged six-cylinder diesel
engine with a displacement of 14 litres that produced 400 hp at 2,100 rpm.
Turbocompounding the engine resulted in a decrease in fuel consumption of
about 27 g/kW.h over the operating range.  Other manufacturers such as
Caterpillar and John Deere are known to have worked on electric turbo
compounds for their engines."

The best turbo compound truck engine so far is Detroit Diesel DD15.

Paul Lamar


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