Diesel pistons

Injection pressures of up to 2,200 bar, mean pressures of up to 31 bar, peak pressures of up to 210 bar, specific power output of up to 100 kW per liter, and ever lower exhaust gas emissions—these are the current requirements for modern passenger car diesel engines.

In order to overcome severe loads due to high temperatures and pressures, MAHLE has developed passenger car diesel pistons made of aluminum as well as diesel pistons made of steel.

Aluminum pistons

MAHLE aluminum pistons for passenger car diesel engines are cast from high temperature-resistant aluminum alloys. Standard features include ring carriers made of high-strength cast iron to increase the wear resistance of the first ring groove, salt core cooling channels or cooled ring carriers, and MAHLE EvoGlide coatings to optimize the running characteristics of the skirt. For high-performance engines, MAHLE additionally uses bushings in the piston pin bores.

Steel pistons

In diesel engines, steel pistons provide significant potential for reducing CO2 emissions in comparison with the aluminum pistons that have been typical up to now. After a long history of positive results in commercial vehicles, MAHLE has therefore developed steel pistons for passenger car diesel engines to the point of series production readiness. Significant advantages result from the frictional loss. Thermodynamic conditions additionally result in advantages in combustion that lead to a reduction in fuel consumption and emissions levels. The lower compression height of a steel piston can also be utilized to increase the swept volume or to decrease the height of the engine.