Engine balance
（重定向自Secondary balance）
![0:Cylinder block & crank case1:Piston2:Conrod3:CrankshaftWhen the location of B in the drawing on the right is kept at 90° after TDC and if conrod(2) swings right to the vertical position, location of C rises on the arc of the radius 2. The up-down position of the new C location (which is higher than the original C position) is equal to the half-way point of stroke for the small end.](/Images/godic/202502/09/Piston_bielle_vilebrequin_coupe_et_schema_cinematique.svg2251.png")
![BMW R50/2 boxer-twin engine viewed from above, showing the left & right cylinders being offset](/Images/godic/202502/09/Opposed-cylinders-5002251.jpg")
2251.jpg")
![Jaguar XK inline six with 'three' SU carburetors, which would cause irregular intake pulse at the front and the rear carburetors were it not for the balance passages in the manifolding](/Images/godic/202502/09/Jaguar_E-Type_engine2252.JPG")
Engine balance refers to those factors in the design, production, engine tuning, maintenance and the operation of an engine that benefit from being balanced. Major considerations are:
This article is currently limited to structural and operational balance within an engine in general, and balancing of piston engine components in particular.