Over the last 100-plus years, there has been such an incredible array of different types, styles, and configurations of engines in motorsports.
Our list today is going to focus on the Top 20 in history. In some cases there might be one year of a very specific motor, while in others it might be a foundational architecture that has proven it's worth over decades of proven usefulness.
Please let us know what you think we got right, and wrong. We know you will.