What is the Difference Between Cast Iron Engines and All-Aluminum Engines?

[McLogan]

The differences between cast iron engines and all-aluminum engines are as follows: 1. Weight: For the same displacement, all-aluminum engines are approximately 20kg lighter than cast iron engines. 2. Volume: From a physical property perspective, iron has a higher density than aluminum, so aluminum engine blocks typically have a larger volume than cast iron ones. 3. Corrosion Resistance: Cast iron has better corrosion resistance. All-aluminum engines are prone to chemical reactions with water during operation, leading to continuous erosion of the aluminum surfaces and reduced lifespan. 4. Anti-knock Performance: At the same compression ratio, aluminum engine blocks can use lower-octane gasoline compared to cast iron engine blocks.