I had the pleasure of going to college with a foreign student who one day, while hanging out in the student union building, announced that we was going to build a minature V-10. I knew he worked in his fathers machine shop but............Yeah Right!
Well 18 months later as a senior engineering student he told me he was close to completion but had concerns about cooling and lubrication. I was a non-believer until he showed me a tiny spark plug and the rocker-arm assembly. He subsequently asked me for a loan which I denied because I too was a starving student. I eventually traded some things to him and in turn he "loaned" me his model radio controller, a bunch of servos, batteries, modeling tools, etc. (which I still have).
I heard from this person again after about a year and he again asked for a loan... and I again denied. What was interesting was that he finished the engine, had not solved the cooling problem, and was looking for a scaled chassis to place it in. I was adamant that there must be someone in Silicon Valley (California) with big bucks willing to sponsor him. I don't know if he ever pursued this.
Can you imaging having a scaled working model (chassis, engine) of this set-up in your trophy case? WOW!
