CREATE TABLE "sdi_vs_other_vw_group_diesel_engines" (
  "engine_model" text,
  "engine_displacement" text,
  "valvetrain" text,
  "max_power_k_w_ps" text,
  "rpm_for_max_power" text,
  "max_torque_nm_ft_lbf" text,
  "rpm_for_max_torque" text
);

Question: What is the valvetrain with an engine model that is engine model?
SQL: SELECT "valvetrain" FROM "sdi_vs_other_vw_group_diesel_engines" WHERE "engine_model"='engine model';