Balance shafts are most common in inline four cylinder (straight-4) engines which, due to the asymmetry of their design, have an inherent second order vibration (vibrating at twice the engine RPM) which, contrary to popular belief, cannot be eliminated no matter how well the internal components are balanced. This vibration is generated because the movement of the connecting rods in an inline engine is not symmetrical throughout the crankshaft rotation; thus during a given period of crankshaft rotation, the descending pistons and ascending pistons are not always completely opposed in their acceleration, giving rise to a net vertical inertial force twice in each revolution whose intensity increases exponentially with RPM, no matter how closely the components are matched for weight. See the 0 degree cylinder angle, 180 degree crankshaft angle animated example here for a very clear depiction of this sometimes hard to visualize vibration (as well as the mathematical equation which describes it).
Online Balance Shaft Eliminator Kit Instructions >>
Installation Instructions for H22A/A1 & H23
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Balance shaft eliminator kit information >>
-What's included in the balance shaft eliminator kit? -What are the benefits? -What about vibration?
