Quote:
Originally Posted by Gilles
Since everyone is mentioning their 'personal opinion' here is mine (please ignore if you wish..) 
But having oil 'inside' the IMS shaft (IMHO) could cause imbalance issues, I first saw this 'technique' when I visited the shop that invented this technique Vertex (..?) and has not convinced at all..
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I wonder about this as well. Does the hollow shaft fill with pressurized oil? If so you now have quite a mass of liquid rotating at relatively high rpm resulting in inertia and perhaps imbalance when the rpm’s decrease and increase. If it doesn’t fill but only partially then you have a liquid being sloshed around that has its own issues like cavitation. I just don’t think the shaft was designed to be an oil journal.