I had an exam question at uni in final year about the balancing of 5 cylinder engine regarding 1, 2,3
etc order vibration. Was an awesome question because it proved it could be balanced in the vertical such the 1,2,3etc order but the moment was extremely poor eg. rocking front to back. Hence why I expect the engine mounts to wear out.
I even followed up the lecturer afterward and he said I nailed it why he uses it as an exam question

