Power balance reffers to the equal contribution of each cylinder to the overall engine power. The principal aim is to check if you have or have not got it. If not there how to get it back or the closest comprimise. This of course insures the best possible and smoothest idle possible for your situation or is a large contributor. There is a gain in available horsepower and torque possible as well. Needless to say milage is increased too. Hopefully most engines checked will already be in good condition. It only takes a milli volt reading and possible moving of your glow plugs around into different positions to check if needed or not in most cases. This is not based on rocket science. Plus some of our engines are older and have really not had good care. If they ran not quite right they were left alone. The old senario if not broke leave it alone. In a bad power balance situation it is somewhat broke but still running. Power balance is more like a tune up.The beauty that it is a cheap proceedure to identify things that are sub standard accuratly does apply. Plus it proves the fault before you spend money on it if you wish. Can you fellows stand another dose of this stuff right now or should we wait awhile?