Which risk increases when advanced gasoline direct injection (GDI) engines experiences excessive piston crevice volume?

💡 Explanation

When piston crevice volume increases, more fuel escapes into the space between the piston and cylinder wall, causing incomplete combustion and increased particulate formation during the expansion stroke. Therefore, increased particulate matter emissions results, rather than changes in compression, temperature, or injector life which depend on alternative thermal/mechanical constraints.

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