MAHLE TopWeld steel piston for high-speed diesel applications

MAHLE TopWeld steel piston for high-speed diesel applications. 2-5% CO2 reduction compared to aluminum pistons.
The lower thermal expansion of steel compared to aluminum results in a significant lower friction between the piston and the cylinder liner. Under temperature load there is still a remaining running clearance between cylinder and steel piston. Using the aluminum piston there is an overlap due to the thermal expansion of the piston.
The higher strength of steel permits a significant reduction of the compression height and in total a lower weight of the piston assembly compared to an aluminum piston assembly.
The lower compression height allows the usage of a longer con-rod. This has a positive effect on the maximum side forces and because of this directly a positive influence on the friction losses. When using the original con-rod length, it is possible to decrease the engine height. This results in potential lower air resistance of the vehicle or in a better behavior in terms of pedestrian protection.
In summary, the new TopWeld piston design achieves 2-5% CO2 reduction due to lower friction because of no thermal overlap and reduced side forces. In addition a weight reduction of the piston assembly due to the higher strength of steel provides the opportunity to reduce the friction losses and the mass not only of the piston but also of the whole engine by reducing the counterweights of the crankshaft and the bearing loads.

Category:

Autos & Vehicles

Tags:

• MAHLE
• speed
• engine
• piston
• Diesel Engine
• Quality
• car
• aluminum

[gomezpiro]

Thanks 4 the info !