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Rebrickable link:
https://rebrickable.com/mocs/MOC-33398/AKM-Sky/piston-engine-flat-four/#details

Piston Engine Flat Four

This is not a "boxer" engine, explanation can be found here:
https://jalopnik.com/its-time-you-knew-the-difference-between-boxer-engines-1825246413
The model is very simple, can be done with your spare parts and used as MOC engine if you want something unusual.

flatfour 01.jpg
flatfour 02.jpg
flatfour 03.jpg
flatfour.io
Piston Engine Flat Four.pdf