Not sure if repost but guy makes great sounding Lego engines.
https://www.youtube.com/watch?v=euJriwnzSt4
https://www.youtube.com/watch?v=TIjyKTV4pQA
https://www.youtube.com/watch?v=573dIvEcOWo
https://www.youtube.com/watch?v=euJriwnzSt4
https://www.youtube.com/watch?v=TIjyKTV4pQA
https://www.youtube.com/watch?v=573dIvEcOWo