[Please note : This video is for AFOLS (Adult Fan Of Lego), lego builders and collectors. This MOC is a personal creation , this is not an official LEGO set, you can't buy it on shelves.]
For my next MOC to be released on superk-technic.com I needed a small engine to fit in a 5x7 studs hole.
PDF instructions are available on Rebrickable : https://rebrickable.com/mocs/MOC-3553...
This building method accomodates engine from V6 to V12: https://flic.kr/p/Q4QMyV
Enjoy, and feel free to improve it.