1
racing (of an engine);idling;spinning (without grabbing; of wheels)
エンジンを空回りさせちゃいかん。長持ちさせたいからね。
Don't race the car. We want to make it go as far as possible.
2
going round in circles (of an argument, discussion, etc.);going nowhere;being fruitless
Other forms
カラ回り 【からまわり】 (search-only kanji form) · 空まわり 【からまわり】 (search-only kanji form)