Quote:
Originally Posted by Law
Same but different.
They are obviously related & based on the same block/architecture but they're not exactly the same.
Take the USDM 8th-gen Civic SI 2.0L I-4 vs the JDM (FD2) Civic Type-R 2.0 I-4.
Yes, they are both from the K20 block, both displace 1998cc, same block, same design. But at the same time, they are quite different. K20Z3 in the former, K20A in the latter; 11.1 C/O vs. 11.7, 197bhp vs 225ps, different heads, cams, redlines, etc.
So while both the Civic SI & Civic Type-R are related & have related K20 engines (i.e., same block/architecture), they are different engines. K20Z3 =/= K20A
Similarly, while both the M156 & M159 are 6.2 AMG V8's derived from the same AMG 6.2 M156 base block and manufactured in the same foundry by the same people, the known differences (in addition to the ones you mentioned above) such as a different [more aggressive] valvetrain, dry-sump lubrication, individual throttles, etc. do effectively render them different engines. It is not just "tuning" that yields near 100 BHP in an NA engine.
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That's exactly what I said - that the engines are virtually identical with respect to overall design/displacement. But, due to some different internals (better to say in most instances "beefed up" internals) and correspondingly, distinct tuning setups, the motors each warrant unique code names/designations.
My point was that the M178 is a great preview of what the W205 motor will be like, as they will both be 4.0L biturbo motors that share architecture and design to a similar extent that the M156 and M159 did.