Question: What is the modified torque (lb/ft) when the standard hp n/a?
Schema: create table table_19704392_1 (modified_torque__lb_ft_ varchar, standard_hp varchar, PRIMARY KEY (modified_torque__lb_ft_))
SQL: select count(modified_torque__lb_ft_) from table_19704392_1 where standard_hp = "n/a"