Quote Originally Posted by KnifeEdge_2K1
boxer engines or horizontally opposed or flat engines are completely ballanced no matter the number of cylinders as long as they're even number of them on both sides

if your primary concern is smoothness make or purchase a boxer engine, the only companies currently mass producing them are subaru and porsche i think
but if you plan to make one then ur gonna have trouble since it needs duplicate blocks and cams and intake/exhaust is gonna be a problem if you're putting it in the chassis of another car bla bla bal

i think i read something a while ago saying that because of the different firing pattern between Subaru's and Porsches engines, theyre both technically not boxers, only one of them is