original_query: What were the differences between the "Browntop" and "Blacktop" engines? What is the most relevant chunk to answer the query?
query: What were the differences between the "Browntop" and "Blacktop" Acura Integra engines?
answer: The "browntop" (1986-1987) and "blacktop" (1988-1989) Acura Integra engines, both D16A1, differed in their internal components.  The "blacktop" had lighter rods, domed pistons (higher compression), and an electric advance distributor (vs. vacuum advance in the "browntop"). This resulted in a small performance increase.