07-10-2015, 04:41 PM | #1 |
384
Rep 548
Posts |
N20 "235i killer" engine rebuild
Hey guys I am back for the second time around as I had to shut down my first thread due to some issues that came about with BMW NA. Anyway... after a few weeks we finally tore the engine apart, cylinder head and valve train are in great shape but we found out that piston number 1 cracked due to too much boost.
What makes this a strange scenario is that the usual suspect in these blown N20 motors is the damaged connecting rods but that is not the case with my motor. Rod bearings, connecting rods, crank shaft, and even the cylinder walls are undamaged. The vehicle has a tad bit over 18k miles, oil changes done every 5-6k miles. I was running the JB4 on map 1 with 91 pump gas at the time of the engine failure. All the engine work is being done by my good friend Sergio (owner of EcElite Autmotive in Huntington Beach CA) Last edited by e46m3lol; 07-11-2015 at 12:27 PM.. |
07-10-2015, 05:18 PM | #2 |
Captain
451
Rep 845
Posts |
Subd. Looks interesting.
__________________
|
Appreciate
1
|
07-10-2015, 07:04 PM | #3 |
Brigadier General
1061
Rep 3,258
Posts
Drives: 2015 F36 Jet Black Sport Line
Join Date: Apr 2015
Location: Blue Skies
|
Welcome back E..thanks for the update.........looking better..back on the road soon for sure.
__________________
2015 BMW F36 428i JetBlack. Sport Line Edition
25% 3M Tint| |
Appreciate
1
|
07-11-2015, 10:48 AM | #4 |
384
Rep 548
Posts |
|
Appreciate
1
|
07-11-2015, 11:24 AM | #5 |
Captain
185
Rep 869
Posts |
What's with the title? M235i killer engine?
__________________
|
Appreciate
0
|
07-11-2015, 11:27 AM | #6 |
384
Rep 548
Posts |
|
Appreciate
0
|
07-11-2015, 01:03 PM | #7 |
Captain
451
Rep 845
Posts |
You know, the N20 is very pretty with all of the interior guts exposed and the cosmetic panels off.
__________________
|
Appreciate
1
|
07-11-2015, 01:10 PM | #8 |
384
Rep 548
Posts |
|
Appreciate
1
|
07-11-2015, 04:09 PM | #9 |
NewFinishColumbia/detailer
604
Rep 2,096
Posts |
It's mathematical art. Good to see you are getting it rebuilt. Issue with BMW NA huh? ha ha.. I bet.
__________________
328 F31 xDrive/OSM/Venetian Luxury Line/Cold Weather/Premium/Driving Assist/Nav/Tech "Golden Goose"
78' Honda CB400A project http://www.instagram.com/steve_inf31 |
Appreciate
0
|
07-11-2015, 05:06 PM | #10 |
384
Rep 548
Posts |
|
Appreciate
0
|
07-12-2015, 10:24 AM | #11 | |
Captain
185
Rep 869
Posts |
Quote:
Just curious how much was spent and what was done to get the n20 engine faster than the n55 stock ?
__________________
|
|
Appreciate
0
|
07-12-2015, 01:05 PM | #12 | |
IG @bmwF9xG80
3813
Rep 7,593
Posts
Drives: G80 M3, X4M, G07 X7m50
Join Date: Apr 2012
Location: NYC to NJ to Orlando FL
|
Quote:
^^ +1
__________________
60-130mph 6.5s X4M #HCP
60-130mph 5.0s G80 M3 #OrlandoAutowerks Sauce IG: @bmwF9XG80 |
|
Appreciate
0
|
07-13-2015, 05:52 AM | #14 |
Lieutenant Colonel
2690
Rep 1,977
Posts
Drives: 2020 M2C HS & Ferrari Roma
Join Date: Sep 2014
Location: Sydney, Australia
|
Good to see that the beast is on it's way back on the road. You are paving the path for the rest of us 228 owners to follow in the future. Thanks for being the first, I guess you are copping the problems that we will know to avoid in the future!
|
Appreciate
1
|
07-13-2015, 09:17 AM | #15 |
Private
12
Rep 70
Posts |
Congrats with comeback! What advice would you give to N20 drivers who want to tune the engine? ECU tuning vs Box? How much gain to achieve without hurting the engine? Is it necessary to change some hardware or flashing software is enough? I am asking you all this, because of thinning about ECU flash of N20 in my 220i, which is going to have the same PS and torque as 228i. Taking in consideration that the only difference with motors at 220i and 228i is compression ratio, I am wondering if such a power gain for 220i will be too unhealthy? What do you think?
|
Appreciate
0
|
07-13-2015, 12:25 PM | #16 | |
Brigadier General
1061
Rep 3,258
Posts
Drives: 2015 F36 Jet Black Sport Line
Join Date: Apr 2015
Location: Blue Skies
|
Quote:
__________________
2015 BMW F36 428i JetBlack. Sport Line Edition
25% 3M Tint| |
|
Appreciate
0
|
07-13-2015, 12:26 PM | #17 |
384
Rep 548
Posts |
I actually had the opportunity to run a few modded N55 and N54 vehicles in which I won so I can confidently say I was faster than a stock N54 or N55. Anyway... Realistically speaking I would say that for the price of ALL the mods that I have on my car (well over $18k), you're way better off just buying a car with a bigger motor and building that up. I wanted to push the limits of this car and be known for having one of the fastest 228s and I am happy with that.
|
Appreciate
1
|
07-13-2015, 12:48 PM | #18 | |
384
Rep 548
Posts |
Quote:
I went into my whole car build knowing I was going to be pushing the limits of the motor and at any given time something like this could happen and unfortunately it did |
|
Appreciate
2
|
07-13-2015, 01:17 PM | #19 |
384
Rep 548
Posts |
Glad to hear that I can be of help to the community. However I'm still scratching my head as to why the connecting rod didn't snap or bend before the piston did
|
Appreciate
1
|
07-13-2015, 01:36 PM | #20 |
384
Rep 548
Posts |
|
Appreciate
1
|
07-13-2015, 02:27 PM | #21 |
Brigadier General
1061
Rep 3,258
Posts
Drives: 2015 F36 Jet Black Sport Line
Join Date: Apr 2015
Location: Blue Skies
|
Yeah..pretty sure the N20/N26 are about the same..but the 220 (or 320 for that matter) I thought had quite a few differences..compression, pistons, rods, etc...
__________________
2015 BMW F36 428i JetBlack. Sport Line Edition
25% 3M Tint| |
Appreciate
1
|
07-13-2015, 02:29 PM | #22 |
Brigadier General
1061
Rep 3,258
Posts
Drives: 2015 F36 Jet Black Sport Line
Join Date: Apr 2015
Location: Blue Skies
|
Since you work for BMW Dealer..hope you're getting an employee discount at least.......
__________________
2015 BMW F36 428i JetBlack. Sport Line Edition
25% 3M Tint| |
Appreciate
1
|
Post Reply |
Bookmarks |
|
|