Originally Posted by
Evodelta
I think we may be talking about different bearings here perhaps, (a labeled diagram would help maybe?) the cambelt idler bearing is mounted on the balancer shaft so not independant and which is why it can spin it when there is no BB fitted. If it doesn't then maybe your shaft bearings are buggered. It must be spinning if you are feeling imbalance, you wouldn't notice anything otherwise as your engine is sat on floppy rubber bushes.
As to whether to run a BB or not, well my choice is on a road car yes, on a full on comp car engine no, I believe it was put there for a good reason.
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