If pistons and rods are lighter than stock and you are using the stock crank as it is, the engine is going to be unbalanced, and this not only will cause vibrations, it could damage the main bearings and also the crankshaft.
You can determine the amount of material to remove and its location on the counterweight to reset the correct balance, to do it you need to know the weight reduction on the piston side (piston, rings, pin, and the alternative part of the rod)
- SNO Director, Spain branch, Barcelona
- '90 2.0 Spider -- '93 164 QV -- '93 155 2.0 TS -- '02 156 2.5 V6 -- '?? FMG 3.8 Project