>>6731444>What's a good way to design an engine? I don't have much room to work with (about 4x4 diameter circle) but I can go a little long if need be.If you want a bold, aggressive engine, you can't go wrong with an air scoop and some cylinder exhaust pipes. There are a few easy ways to make those:
https://www.bricklink.com/v2/catalog/catalogitem.page?P=30553https://www.bricklink.com/v2/catalog/catalogitem.page?P=11090https://www.bricklink.com/v2/catalog/catalogitem.page?P=41862Or just use this piece clipped to a bar with a stud attached.
https://www.bricklink.com/v2/catalog/catalogitem.page?P=15712 