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Le Mans: Unique turbo diesel engine for the Audi R18 TDI (+photos)

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Khatir Soltani
From Audi Motorsport

The new Audi R18 TDI with which Audi targets its tenth victory in the famous 24 Hours of Le Mans on June 11-12 is ready today with "tomorrow’s" technology.

Photo: Audi Motorsport

During development of the new LMP1 sports car the integration and future electrification of the powertrain and various possible concepts for energy recuperation have been taken into account.

New regulations devised by the Automobile Club de L’Ouest (ACO) and introduced this year dictate significantly smaller engines.

Audi has chosen a particularly compact 3.7 liter V6 TDI engine, which is about 25 per cent lighter than the V10 TDI power plant previously fitted to the older R15 TDI, and which leaves all options open for the technicians with regard to electrification and energy recuperation.

To lower the center of gravity as much as possible and to improve airflow through the car, the exhaust manifolds were migrated from the left and right hand sides of the engine to sit between the two cylinder banks.

Photo: Audi Motorsport

The V6 TDI engine powering the Audi R18 TDI, which has a cylinder angle of 120 degrees and thus an extremely low center of gravity, is technically generations further along the line and is also a technology-demonstrator for future production engines.

In contrast to previous Audi Le Mans sports cars, which all had twin turbochargers, the R18 TDI is quite logically now only fitted with a single turbocharger that also sits above the engine and draws its air directly through the air scoop mounted on the roof.

Khatir Soltani
Khatir Soltani
Automotive expert
  • Over 6 years experience as a car reviewer
  • Over 50 test drives in the last year
  • Involved in discussions with virtually every auto manufacturer in Canada