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Originally Posted by mkoesel

It remains somewhat baffling that they have no apparent plans to include their new M256 I6 engine family in their performance product lineup. It leaves an obvious hole - 400hp ICE and 600hp ICE, but no 500hp ICE. They went through the trouble to develop the engine only to leave it hamstrung at 430hp, and then went ahead and pushed their four cylinder beyond that - to within an inch of its life, it would appear. Sure, it’s more difficult to package an I6, but that should not have been a surprise. It’s not like they hadn’t ever built an I6 engine before. And with the beltless design, the new one is very compact.

This would seem to leave them vulnerable to BMW (and others) who can bring performance PHEV setups with six cylinder engines to market that make far more than the 440hp of their M139 I4 (before you get to the electric motor side). Obviously Mercedes still has the V8, but so does everyone else. And at this point, no one is putting a V8 in smaller vehicles anymore, PHEV or otherwise. By contrast, there is still plenty of time left for six cylinder engines in such vehicles.

Completely agree with you. Although I've never driven an MB I6, from everything I read, it's a gem of an engine. I frankly would have 0 interest in a 4 cylinder AMG as I just don't like the character of 4 cylinders in general (at least compared to 6-8-10-12 cylinders). I wouldn't necessarily mind a PHEV as long as it's in an addition to a fully ICE weekend car though, I think they have their place.

The only thing I can think of is that an I6 would just be simply too heavy for a "medium" sized performance car.

P.S. I'm also curious about electric turbos. I know there's a few floating around, but I figured they would have been more mainstream by now. It kind of went quiet on that front.