Both engines have been obsessive passion projects for me. I spent days designing everything, buying parts, and tinkering with everything to perfection. I did have to use 2 rubber bands taken from used correction tapes for the serpentine belts tho so it's not strictly 100% Lego. But everything else is still Lego so I guess they still count as Lego MOCs. submitted by /u/FranticRanger8786 [link] [comments]