Table: ford_sigma_engine
Columns: code
years
displacement_bore_x_stroke_type
power_rpm
torque_rpm
compression_1

Question: Code of 1.6 duratec ti-vct, and a Power@rpm of ps (kw; hp)@6300 has what torque@rpm?
SQL: SELECT "torque_rpm" FROM ford_sigma_engine WHERE "code" = '1.6 duratec ti-vct' AND "power_rpm" = 'ps (kw; hp)@6300'

Question: Code of 1.6 duratec ti-vct, and a Power@rpm of ps (kw; hp)@6000 has what torque@rpm?
SQL: SELECT "torque_rpm" FROM ford_sigma_engine WHERE "code" = '1.6 duratec ti-vct' AND "power_rpm" = 'ps (kw; hp)@6000'

Question: torque@rpm of n·m (lb·ft)@4050 has what code?
SQL: SELECT "code" FROM ford_sigma_engine WHERE "torque_rpm" = 'n·m (lb·ft)@4050'