. "jump-spark ignition" . "Spark-ignition engine" . "spark ignited" . . . "Spark-ignition engines" . "Spark Ignition (Gasoline)" . . . "spark ignition engines" . "spark ignition (SI)" . "spark-ignition engine" . "Otto" . "spark-ignition" . "spark-ignited" . . "Spark Ignition" . . "Spark-ignition engine" . "spark plug" . . "SI engine" . . "spark ignition" . "spark-ignition (SI) engine" . . "spark-controlled compression ignition engine" . . .