this post was submitted on 09 Jul 2024
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I know for most triples, they fire evenly at 240 degrees of crank rotation. The cylinders should have perfect primary balance in the same way that three-phase alternating current is balanced (please correct me if I'm wrong on this). The secondary balance will be off, but this is relatively minor. Overall, I believe triples have better overall balance than twins, but less than fours.
For a better source, check out this FortNine video: https://www.youtube.com/watch?v=aOTz0Ol8fLA
Edit: The above video says triples are very imbalanced, maybe I'm quite wrong here.