CREATE TABLE "engines" (
  "model" text,
  "engine" text,
  "displacement" text,
  "valvetrain" text,
  "fuel_system" text,
  "max_power_at_rpm" text,
  "max_torque_at_rpm" text,
  "years" text
);

Question: What fuel system does the diesel engines model have?
SQL: SELECT "fuel_system" FROM "engines" WHERE "model"='diesel engines';

Question: What is the displacement for the petrol engines model?
SQL: SELECT "displacement" FROM "engines" WHERE "model"='petrol engines';