Originally Posted by Maestro
However, I think they went back to the older all Al engine due to issues they were unable to resolve with the Al/Mg alloy engine. The reason I say that is because I do not buy the comment that says it would not be strong enough.
Ferrari use a Al/Mg alloy block for their 600 hp engines in the 599 GTB, so why can that engine handle it and not the BMW.
I think one reason is that Ferrari inspects and tests each block as they are made verses BMW mass productions. So maybe it was becoming too costly for BMW to deal with the Al/Mg engines. It is a shame since the Al/Mg would give us a lighter car and cooler engine.
FI puts a lot more pressure on the cylinders, hence the iron linings and one material for the block. Having two materials means two different coefficients of expansion, probably not ideal for a FI setup.
I'm not saying there isn't an issue with the al/mg block BMW uses, just kind of pointing out the obvious reasons not to use it in the N54.