[Paul-Bracq-BMW]

To complete my case, here's the excerpt from the technical training material of the M2. The attached is the section on the engine.

First here are the regular N55 engine (code: N55B30O0) and the M2's N55 engines side by side (code: N55B30T0). You can see that they share the SAME engine block. Therefore there is NO WAY possible that this engine block could be of closed deck design. It would need to be much sturdier in design .

The difference between the 2 engines are:

1. Intake manifold
2. Crankshaft bearing shells (from S55 engine)
3. Pistons (from S55 engine)
4. Oil supply and oil sump (from S55 engine)

N55B30O0 and N55B30T0 side by side, note the same crankcase



Except from the M2 Technical training showing the difference between the N55B30O0 and N55B30T0:












S55 engine for comparison. Note that the crankcase is much sturdier. and of different design...





I guess this says it all!