Hi all, I have a really big speech tommrow evening concerning a major project for my senior year in high school, and I chose progression of engines as my topic. I need a way to explain how you get a motors displacement in a way some women and non gearheads can halfway understand. Also, I am discussing steam engines and internal combustion engines if anyone wants to add to that. I will also be discussing why torquing main caps down is important and why you shouldn't go too tight because of the bearings and all. If anyone can help me I greatly appreciate it. If you guys don't mind, tell me a way that can take the longest way possible as I have to talk for 6-8 minutes. Thanks!