Whereas once Audi Sport and Porsche Motorsport shared virtually nothing between their R18 and 919 LMP1 programs, the modern era of LMDh prototype development ahead of the 2003 racing season will see the two Volkswagen Group marques (and possibly a third likely Bentley or Lamborghini) share chassis construction and engine. Since Porsche Motorsport has begun to reveal details of their version of the project, much of what is shared confirms details for Audi racing fans as well.
Porsche Penske Motorsport has begun testing the Porsche LMDh rather publicly, and a wave of video, photos and details have followed. Key amongst them is confirmation of the engine being a much rumored biturbo V8. “We were spoiled for choice with the engine for our LMDh prototype, because the product range offers several promising baseline units,” said Porsche Motorsport VP Thomas Laudenbach. “We decided on the V8-biturbo, which we feel offers the best combination of performance characteristics, weight and costs. The kick-off to the active test program was an important step for the project.”
Porsche hasn’t revealed displacement or origins of the race engine, but rumors in the industry have continued to point toward the 4.0 biturbo V8 used in production. Amongst the photos released by Porsche, it’s clear that the racing engine uses the same “hot V” configuration as the production 4.0 from the RS 6, RS 7 and RS Q8, with exhaust and turbos paced atop the engine and air intakes fed through the side of the heads.
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[source: Porsche]
The vehicle will be fielded in the FIA WEC World Endurance Championship and the North American IMSA WeatherTech SportsCar Championship under the team name Porsche Penske Motorsport. Now, the intensive test programme to prepare for the race debut in January 2023 has started. This premiere will take place at the traditional opening round of the IMSA series – the 24 Hours of Daytona. In selecting the combustion engine to complement the standard hybrid elements, as stipulated by the regulations, Porsche opted for a large-capacity twin-turbo V8 unit. The powerful engine is designed to run on renewable fuels, which means a significant reduction in CO2 emissions. In the race, the system output of the hybrid drive reaches around 500 kW (670 hp).