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      12-07-2018, 09:16 PM   #1990
brad850csi
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Quote:
Originally Posted by mkoesel View Post
As for what comes after the N63 TU3 - that is anyone's guess. I suspect we have at least 15 more years of the BMW V8 engine, and perhaps even 20 or more. No doubt they will make incremental updates to the N63 during that time. However, a brand new V8 architecture - specifically one that would see the engine displacement shrink to 4L (and presumably the physical size to become more compact as well) - as was once rumored, seems less and less likely as the era of the EV commands more and more of automakers' powertrain R&D.

The V8s since the m60 (first modern BMW V8 and ignoring the S65 which is bespoke) have had the same 98mm bore spacing. Impressively they've had these different capacities:

2997cc 84.0mm x 67.6mm M60
3498cc 84.0mm x 78.9mm M62
3599cc 84.0mm x 81.2mm N62
3999cc 87.0mm x 84.1mm N62
3982cc 89.0mm x 80.0mm M60 & N63
4395cc 89.0mm x 88.3mm N63 & S63
4398cc 92.0mm x 82.7mm M62 & N62
4619cc 93.0mm x 85.0mm M62
4799cc 93.0mm x 88.3mm N62
4837cc 93.0mm x 89.0mm M62
4941cc 94.0mm x 89.0mm S62

Weirdly the 89mm pistons on the N63 and S63 are shared with the N74 V12. The N74 has 98mm bore spacing as well but the turbos are on the outside

The current N63 has an option for 3982cc for the Chinese market, perhaps that crank and piston could be the basis for new global versions of the engine in the future if they keep the same 98mm bore spacing and in turn the basic block.

Otherwise the next engine potentially could be based on the same modular platform as the B38/48/58. Currently the highest power per cylinder in the family is the i8 B38 at 170kw for 3 cylinders (56.67kw per cylinder) and the torque winner is the X2 M35i at 450nm for 4 cylinders (112.5nm per cylinder)

The S55 in CS guise is 56.33kw per cylinder so basically the same as the i8 spec but what is interesting is that the S63tu in the F90 M5 Comp Pack is 57.5kw per cylinder - more than any other BMW, although of course this is a 549cc cylinder instead of 499cc per cylinder which helps of course.

I'd like to see a modern V8 from BMW with a fully fresh design, but I can't help but think that the S63tu is a very capable engine already and gets decent CO2 figures, so why bother replacing it?
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