I've been looking into the balancing issue, and have also had correspondence with Kamak/Kinugawa who recommend an assembly balance.
There are 2 types of balancing :
1. Rotor Assembly Balancing (Turbine Wheel/Shaft, Compressor Wheel & Shaft Nut)
2. Fully Assembled CHRA Balance
The disadvantage of Method 1 is that it has to be disassembled to refit it into the CHRA (Cartridge).
It also does not include balance with bearings or oil seals (which are like metal circlips). Therefore it is not as accurate as the full CHRA balance.
Turbo Dynamics only balance as part of a full Inspection Service, starting at £195+VAT subject to the results of the inspection.
Other balancing services are available online.
I have located a Method 1 service for £50 and a Method 2 service for £39 + £12 postage. So I think I will go with Method 2.
Method 2 doesn't require disassemble after balance, just needs the Exhaust Housing and Compressor Housing bolted back on.
The machines used vary from large lathe type machines, to bench top soft bearing balancing machines.
All normally come with before & after results.
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