What recently introduced HD diesel cylinder block manufacturing process contributes to much lighter weight engines?

The introduction of compacted graphite iron (CGI) as a manufacturing process for HD diesel cylinder blocks plays a significant role in producing much lighter weight engines. CGI is a unique material that offers an excellent combination of strength, ductility, and lightweight properties. Compared to traditional cast iron, CGI has a higher tensile strength, which allows it to withstand greater stresses while using less material. This reduction in material contributes to the overall weight savings of the engine.

In addition to its strength-to-weight ratio, CGI provides improved thermal conductivity and resistance to wear, which is particularly beneficial for diesel engines operating under high loads and temperatures. As a result, using CGI for cylinder blocks not only contributes to lighter engine designs but also enhances durability and performance.

The other options, while they have their own advantages, do not specifically highlight the same balance of weight reduction and mechanical properties that CGI offers for diesel engine applications.