Stack Plenum ACO Le Mans Peugeot Scrutineer

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Spy in the Plenum

Ian Bamsey investigates the Stack-developed scrutineering system that ensures competitors conform to the ACO’s strict limits on Le Mans engine boost pressure. The ACO, which organises the Le Mans 24 Hour race and sets the technical regulations that are also used by the European Le Mans Series (ELMS) and the American Le Mans Series (ALMS), attempts to equalise performance between different types of engine within each of its various LMP and LM GT divisions. It does this by means of intake air restrictors and also a cap on plenum pressure in the case of turbo-supercharged engines (see sidebar: LE MANS ENGINE RESTRICTIONS). In theory the ACO could cap plenum pressure by means of a mechanical ‘pop-off’ valve, as has been used in Indy Car racing, for example. In practice, it has put the onus on the individual competitor and rather than introduce some form of control device, instead it monitors the plenum pressure of each turbocharged car to ensure that it does not transgress the limit.

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