Quote:
Originally Posted by ForcedInduction
Incorrect on both counts.
1- Imbalance is a proper term and a common word. It's not just the "free" dictionary, open up ANY dictionary and look at it. The quoted definition is from Apple's own included dictionary application.
2- The T3 and K2x used on the OM6xx engines are NOT balanced together. This is evidenced by the fact the nut securing the compressor wheel on the shaft is unmodified.
You can tell how the balancing was done by the shape/appearance of the COMPRESSOR nut. If the nut appears to be ground down then the turbine wheel and shaft and the compressor wheel (and nut) were balanced together. If the nut is not ground down then the wheels were done individually. If the wheels were done individually then it is not absolutely necessary to mark them and get them in the same location as they were prior to removal. In the case of the "ground down nut" turbo, it is a good idea to keep the wheels lined up in their original positions.
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I'm not going to argue with you about it. "Imbalance" is a technically incorrect term and it's not proper in the industry. It's used by people who don't have an understanding of balancing. Use it at your own risk.
Whether they are balanced independently is not relevant. The result that one will achieve with independently balanced components is not all that good. The use of a balancing arbor introduces certain errors that are unavoidable and the process is fundamentally harmed due to the use of that arbor.
The assembly will run with significantly reduced vibration if the two are balanced as an assembly.