more on drivetrain vibration
Another crucial factor to consider apart from the propshaft itself is the accurate alignment of the front and rear components (engine / clutch + transaxle) relative to each other.
I'm told that if you mount an Aurelia Berlina engine into a B20 without lowering the front engine mounts (the Aurelia engine has a mount at each corner, and the front ones on a Berlina are lower - which will raising the front of such an engine if put into a Coupe) terrible drivetrain vibration will result.
As I understand it, this is why a torque tube - a rigid mount joining engine and transaxle together, as per a late Ferrari 275 but not the early ones - is sometimes used.
I'm about to put a modified B12 engine into a B20 and the solution is 1. to use a B20-type bolt-on mount for the front right of the engine, and 2. to reduce the height of the rubber bushes on the front lhs where the generator is. Not ideal to run with less insulation, but the alternative would be to machine the block or cut the car's shell: neither desirable.
Anyway, a fresh and correct set of rubber mounts for the lovely lumps either end of a Flaminia or Aurelia would be a sensible idea for those suffering from the shakes. These bushes do deteriorate and are available from Omicron and probably others.
Last edited by williamcorke; 01-26-2012 at 11:47 PM.