hi, im a professional diesel engine mechanic and can easily explain what youre hearing. Most italian/european sports cars (with the exception of Mercedes in the past 3 years because American customers) have machined their crankshafts as "flatplane" cranks. Flat-plane cranks, no matter what firing order they have, will always alternate from bank to bank. This yields optimum exhaust scavenging and thus doesn't require…
I found this video to be an excellent explainer on the differences between cross and flat plane cranks: https://www.youtube.com/watch?v=RcyMoZoqkPA It additionally talks about the unusual pattern used in modern voodoo engines in the Ford Mustang (which is also mentioned in the article). The video is very similar to this article.
Re: Ford Mustang [1]
[1] https://www.pocket-lint.com/cars/news/ford/131151-ford-admit...