Gecko
Well-known member
Inline 4's and 6's balance perfectly on the primary balance, but 5's are naturally unbalanced on both the primary and secondary giving them an inherent rocking couple that is normally solved with counter-rotating balance shaft/s. Once you add balance shafts, you can fix a lot of problems.The 206 had a 4 cylinder Deutz, the 212 had a 5 cylinder. Night and day regarding smoothness.
One significant advantage of "greater than 4" cylinders it the overlap of the power stroke giving a smoother power delivery.
Engine balance - Wikipedia
Straight-five engine - Wikipedia
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