
Bore Scoring
Bore Scoring in Al-Si Cylinder Systems
The basic requirements for a cylinder lining are as follows: wear resistance
for the liner, rings, and pistons, as well as resistance to galling and minimal
oil consumption. In the beginning, internal combustion engines favored heavy,
dense, thermally stable cast iron engine blocks for their durability in meeting
these criteria. Besides being heavier than a modern all-aluminum engine, those
made from cast iron provide poor cooling, limited performance, and are nowhere
near as efficient or powerful as today's engines designed to meet tightening
emissions and fuel economy requirements. As aluminum has four times the thermal
conductivity of cast iron or steel, it's the logical choice to overcome these
thermal performance limitations. However, Al-Si cylinder systems require special
surface preparation and piston coatings, not to mention specific lubrication
needs. Balancing these requirements has always been a challenge for engineers,
especially when cost is the driving motivator for OEMs when utilizing liner-less
cylinder technologies. Innovations built upon an all-aluminum engine designed to
maximize efficiency and reduce emissions, coupled with hybrid technologies, will
extend the life of the internal combustion engine as we transition to an
all-electric future.
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SKU: LIB-0026