hi all, i understand that the crankshaft has to be balanced to counter harmonic vibrations - at least in straight 4s and 5s - thus the use of a non-neutral harmonic balancer. a flywheel is for storing rotational energy and is at least by default neutrally balanced. right so far?
WHY would an engine swap require a custom or rare balanced flywheel, then? shouldn't the harmonic balancer which is already mounted to the donor engine do the trick to counter the crank torque, whichever flywheel is used? i have heard a lot about balancing flywheels, and this sounds to me like replacing the role of the harmonic balancer. wouldn't it be much simpler to just use the already balanced crank + HB?
thanks for your thoughts.
WHY would an engine swap require a custom or rare balanced flywheel, then? shouldn't the harmonic balancer which is already mounted to the donor engine do the trick to counter the crank torque, whichever flywheel is used? i have heard a lot about balancing flywheels, and this sounds to me like replacing the role of the harmonic balancer. wouldn't it be much simpler to just use the already balanced crank + HB?
thanks for your thoughts.