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Audi R10 TDI Diesel Wins Le Mans

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The winner: No.8 Audi Sport Team Joest R10. Photo: Bertrand COUSSEAU

An Audi R10 diesel (No. 8) won the Le Mans 24 Hours race this weekend—the first diesel-powered car ever to do so—with a four-lap lead over the second-place car. A second Audi R10 (No. 7) took third after having to replace a turbocharger earlier in the race, a delay that cost it 10 laps.

The Le Mans 24 is an endurance race—the winner is the car that covers the most distance in 24 hours; cars are driven by teams. The No. 8 covered 380 laps on a 13.65-km (8.48-mi) circuit in this year’s race.

The Audi R10 TDI is powered by a completely new all-aluminum, 5.5-liter, twelve-cylinder bi-turbo TDI engine that delivers more than 485 kW (650 hp) and more than 1,100 Nm of torque. (Earlier post.)

The V12 TDI used in the R10 is the first Audi diesel engine with an aluminium crankcase. The cylinder-bank angle is 90 degrees. The V12 TDI has, like Audi production car engines, four valves per cylinder and twin overhead camshafts. The common rail fuel injection system exceeds 1,600 bar. The V12 TDI is equipped with a pair of diesel particle filters.

Peugeot has announced that it will enter the 2007 Le Mans 24 Hours race with a new diesel car—the Peugeot 908—powered by a 5.5-liter V-12 HDi diesel engine equipped with a diesel particulate filter system. (Earlier post.)

The Le Mans 24 Hour race set an attendance record this year, with a total of 235,000 spectators.

Comments

Rafael Seidl

Le Mans limits only the volume of the fuel tank. Diesel has ~13% more energy by volume so that means you can do ~16 laps on one tank vs. ~14 on gasoline. Fewer pit stops gives you a huge advantage in endurance racing. Note that the greater efficiency of the diesel engine in part load matters little when you spend 70% of the time at full throttle.

That said, hats off once again to Audi. Their four-lap winning margin was more than due to the fuel advantage alone. They have a world-class engineering and race team that has now earned its stripes in Le Mans seven years running. Perhaps the hardest part was delivering a lightweight diesel engine that could take advantage of the higher fuel density, and a gearbox that could cope with the stupendous 1100 Nm of torque. The R10 has a 650hp V12 with an aluminium crankcase - production diesels all feature cast iron blocks. Peak rated RPM is ~5,500 vs. ~4,500 in a production diesel. It helps if you have an oil major custom-tailoring your fuel for you (GTL has a high cetane number).

Sports cars are the only vehicle segment that had hitherto not featured diesel engines, because customers perceived the combination as an oxymoron. With this win under their belt, it's probably safe to say that Audi will want to offer a diesel in a future sports car. Here's what it might look like:

http://www.autotrend.com/Audi_LeMans_Quattro.html

jcwinnie

"Fewer pit stops gives you a huge advantage in endurance racing." Hm, following that (drive) train of logic, could there be an advantage to Le Mans race cars using regenerative braking?

Eric H

Regenerative braking requires someplace to store the energy to, and then another system to get it back. Batteries store less energy per pound than diesel contains, and the electric motor and support system (including gear box) is more added weight. There's a reason they went with an aluminum block.

Ken

"Le Mans limits only the volume of the fuel tank. Diesel has ~13% more energy by volume so that means you can do ~16 laps on one tank vs. ~14 on gasoline."

So, the race regulation should be revised.
The tank capacity should be mega joul energy based instead of litters.

rexis

but not to forget that diesel is ~15% heavier then gasoline.

Majeasy

A diesel engine's greater fuel efficiency makes for fewer pit stops. The winning Audi made 27, while the Pescarolo in second made 32.

Lucas

A properly designed and built, Diesel-Hybrid could easily win next years Le Mans.

hampden wireless

Yes batteries have less power per lb then fuel but they are getting recharged and used over and over in a single lap. The challenge would be to size the system right so it was filled and used to the max often. You would not care about long term battery life but you would care about recharge and discharge rates. Maybe supercaps?

Patrick

You would be able to change the batteries after every race so you could really go for the most advanced chemistries for fast recharging and lightweight. All this would be worthless for street use (the battery portion...though efficient controllers and motors could carry over).

Andrey

“Production diesels all feature cast iron blocks..”

You gotta be kidding. At least dozen diesel engines now feature aluminium block. Among companies producing aluminium diesel engines are Volvo, WV, Isuzu, Toyota, Mercedes (notably performance 3 liter), to name a few. Switch to aluminium block is a major recent achievement in diesel technology.

Thomas Pedersen

While such batteries might be worthless for street use, some important chemistry and stress test could be covered by motor sport's aggressive R&D.

They could start off light - maybe a 50 hp motor/generator with a small supercap. That shouldn't weigh much..?

Ruaraidh

Yup dead right Andrey, you beat me to it!

They have aluminium blocks but with cast in iron bearing caps and liners and so forth.

jcwinnie

Why batteries? Why not ultra caps?

jcwinnie

Whoops, hampden wireless said that already, i.e., super capacitors == ultra caps. Very high energy density.

The challenge would be how to install a light strong PM servo in a very durable, dual-clutch tranny.

An Engineer

Le Mans limits only the volume of the fuel tank. Diesel has ~13% more energy by volume so that means you can do ~16 laps on one tank vs. ~14 on gasoline. Fewer pit stops gives you a huge advantage in endurance racing.
So why is this the first diesel to win Le Mans? It is still an achievement, no matter how you look at it.

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