With intake manifolds made of polypropylene (PP), Röchling Automotive (Mannheim, Germany) says it has set new benchmarks in terms of cost, weight, and acoustics. These three criteria have been improved due to the lower density of polypropylene (PP) compared with polyamide (PA), the material currently most widely used for intake manifolds.
At the same time, PP is said to offer sufficient sturdiness. Two reference engines from VW that employ PP are the one-liter three-cylinder petrol engine in Brazil and Europe and the 1.6-liter, four-cylinder petrol engine in China.
"The PP intake manifold is the first and only one of its kind in China and Brazil to date. It's also the first three-cylinder application in Europe, and particularly demanding in terms of acoustics," says Marco Barbolini, product manager for the air intake system at Röchling Automotive. "These are Röchling's first intake manifold applications using polypropylene. To be able to substitute for polyamide, there were a number of challenges to overcome. But we were rewarded with improved acoustics."...