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  Rule changes will address Le Mans' diesel advantage

September 2007

 

Rule changes for Le Mans racecars in October will address the imbalance between gasoline and diesel engines. Critics have argued that the current rules give Audi and Peugeot’s diesel entries an unfair power and range advantage over other competitors.

At present, gasoline turbos can be up to 4-litres; turbo diesels can displace up to 5.5 litres. Fuel tank sizes differ slightly – gasoline cars may carry 90 litres of fuel onboard; diesels 81 litres.

The Automobile Club de l’Ouest (ACO) has asked Gordon Murray, formerly an F1 designer and now a motorsport consultant, to investigate the issue of equivalency. Murray has been working with ACO over the last year on all aspects of the rules.

“It’s obvious that diesels have a massive advantage at the moment,” said Murray. “The present rules don’t balance them out and there will certainly be an equivalency change between gasoline and diesel when the rules are updated in October.”

The changes could range from making diesel tank sizes smaller, to adjusting their fuel flow or even the weight of the cars.
In 2010 there will be more extensive changes, mostly in the LMP1 category, which will force a return to sportscars with roofs

“The LMP1 cars are getting almost as silly as F1 cars where they all look the same,” said Murray. “Closed cars are more recognisable to the public and the manufacturers.”

See also: Rewriting the rule book