BMW did the same thing with the F30 328.

Early 2012 had the N20, later 2012+ have the N26.

Essentially, the change was in the emissions equipment, specifically, the downpipe. Read more, here: http://f30.bimmerpost.com/forums/sho...d.php?t=756878

 

What I said. The only thing that's unclear is whether the F56 JCW model with the new engine will be a late 2015 model or 2016. Motoringfile said somewhere it could be released in Europe early 2015, here spring. That's gonna be a hot car I was tempted to wait for it.

 

So the JCW will have the B48 and not the B46?

 

My 2015 Mini Cooper S finished assembly last week. I just checked my BMW VIN and it says Engine B46A20M0 - 2,00l (141kW).

 

A version of it, yes. >> B48B20O0

 

No, I wasn't.
I wonder where you found that I was kidding?

I was just saying "more likely" than richer running engine.
I didn't say B46 will detonate. I was stating the fact of physics about engine detonation in general and its root cause.

I work on boosted race engines for living, been doing for about 20 years now, and see all the time - detonated engines, when someone tunes their engine too lean. Then it ends up in my shop. When engines detonate, after fixing up all the mess, remapping the ECU a bit richer is one way to prevent it from happening again.
But then I really don't know if B46's tune is leaner than B48 - that was someone else's speculation not mine.

In racing, even when drivers notice a detonation, they keep going especially when nearing the finish line. You just have to.
Sometimes this is how it ends up requiring a bit more work required than just top end repair.

 

^^^ A quart of Slick50'll fix that right up!

 

I like how they "lightened" that #4 piston. Nice work!

 

Chazman - that's a 3 cylinder now.

 

And some JB Weld!