Originally Posted by RIPGermanCastrol
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N55 was not made with tuning in mind, nor was N54 although it turned out to be good platform for that. B series of engines are specifically created in mind with tuning potential as those are modular engines, which N series was not
No? Maybe I don't understand, but I don't see how a modular design implies a design with tuning in mind. It's simply a cost cutting design philosophy. I don't think any manufacturer designs their cars with tuners in mind, and I doubt you could prove it if they did.
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N55 engine was created in a time when V8 was still option, potentially for F30 too. However, high oil prices in 2007-2008 when N55 and F30 were already in development and later subsequent economic crisis took out V8 as an option in F30.
I don't know if a V8 was ever on the table for the F80. As we've seen in recent years, every manufacture is downsizing engines to meet emissions requirements. Gas prices might've had a hand in it, but I doubt that European emissions standards would've made a V8 an option.
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That is not feature that N55 has nor it would be possible to safely extract such power from N55. The fact that BMW decided to go closed deck for M3 tells you that they were NOT confident in design of N55 for such power.
You are going to have to prove that instead of saying "BMW didn't copy+paste the N55 for the M3, so it obviously isn't suitable for even below M3 power." I have not seen widespread block issues in the N54 or N55 with basic bolt ons. It just isn't an issue. To be blunt, you are just wrong. People run N55s in the upper 400s, 500s, and even 600s; rods going through the block are not an issue at 400hp in the N55. I don't know how else to say it. You can do your own Googling, but the N55's block chuckles at 400hp.
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Why bother than with boutique oils if you are keeping cars for few years?
Because I plan on driving this car into the ground, but I'm saying I know it'll be in the ground well before 485,000km. Also, I'm totally anal about minor things on my car like this, so I put more thought in it than I should.
B engines will be used in many more models than N series. They have to be modular and ready for various power output as they will find their way in numerous vehicles. Also, new diesel generation is based on same design, hence closed deck design.
People do run huge amount of power in these engines, especially N54 (and there is a reason for that which apparently is just not getting to you).
And they do have problems, of course depending on execution.
As for F80 and V8 etc. it is too long story for this.