2016 F80 S55 Teardown

[Dgjo2022X5MC]

Enjoy! Nice engine!!! Watch over-rev valve float I guess! Money shift?

https://youtu.be/ydVUo11eiRc?si=06gNwbTvDtAd0XwO

[Jbrown7403]

Love watching videos like this. The S55 complexity makes my head spin

[Dgjo2022X5MC]

I Do Cars is addictive. You want to understand what’s moving the machine, it’s great to see what’s inside!

Subscribe as he is a hard working, funny guy.

Look up the n63 and other BMW engines as well.

[Bennv59]

The s55 is a marvel of engineering, the s58 exists because the s55 set the standard for one of the best inline 6 ever produced

[Dgjo2022X5MC]

As Eric mentions, the machining is great. You can see differences when you watch other engine Teardowns.

There are things you pick up that are interesting (IMO):

-head bolt lengths longer than n versions. Must be a reason!
-you understand why those are 1x use aluminum bolts. They break!
-the valvetronic cam snaps back so fast! You can understand how it has to be that way for throttle response purposes.
-the wear on the main bearings was strange relative to the rod bearings in decent shape. ?? 🤷🏻‍♂️
-cool oiling systems.
-belt driven water pump preferred over electric.
-check out those hollow cams. Cool.
-the intakes were rather clean for DI engine. Maybe walnut blasted. And the machining of ports is nice to see. Clean edges between intake valves.

Lots of good info in these vids.

[M3SQRD]

Nice video. S55is one of BMWs best inline 6s!

[b_w.]

Enjoyed that

[clutchdj]

11:10. Guy is hilarious.

[MaxOctane]

Not sure Eric knows just how prevalent the crank-hub slip is on the S55. I wonder if his assessment in the end (valve float from over-rev) would be different if he knew that. I just don't understand how slipped timing wouldn't cause this.

[Dgjo2022X5MC]

Maybe over rev causes valve float for intake and not exhaust, amd slipped timing would impact (literally) all valves?

Also seems to me the slipped timing failures I have seen have bent valves. This engine seemed not to have that.

[NickyC]

Originally Posted by MaxOctane

Not sure Eric knows just how prevalent the crank-hub slip is on the S55.

But it's really not? Unless you're running E85 and highly tuned the chances are almost nil.

Fun video. The sections where he talked about the rod bearings, meh. Another non issue with the S55.