Four interview rounds, with one phone pre-screen followed by two phone interviews (Technical first then Behavioral) and a five-hour onsite interview consisting of a brief tour of the main production floor, then a thirty-minute presentation (blocked out to sixty minutes for questions). Afterwards, I had six back-to-back one-on-one interviews with various members of the team, with questions ranging from actual (how would you solve a problem with this part?) to theoretical (how does an engine work?) to more about myself (Why are you the best fit for this job?). After this, I was given a tour of the separate facility where I would work before being escorted back to the front desk and leaving. Was told I would receive a decision the week after but got an automated email on Saturday saying I did not get the job. Was not able to get any kind of response from the recruiter afterwards concerning any feedback, which was pretty disappointing considering all the effort I put into everything prior.

Describe to me how an engine in a car works.