E90Post
 


GetBMWParts
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Dyno #'s vs Break-in Procedure



Reply
 
Thread Tools Search this Thread
      08-17-2007, 09:25 AM   #23
Max_!
First Lieutenant
3
Rep
350
Posts

 
Drives: E91
Join Date: Apr 2007
Location: Europe

iTrader: (0)

> Is that how you justify that?

It's how all companies justify everything nowadays, especially in the US.

It also doesn't make sense for BMW to put a complicated break-in procedure in the manual like the one used for race engines. "Take it easy the first few 1200 miles" works well enough.

Trashing your car off the lot is not a good way to break it in, but it's also very unlikely you can break it in really hard in normal traffic.

I'd call a break-in hard if it's driven under track conditions.

> None of these can be machined so perfectly, especially in mass production, not to require a break in period.

But they're also not so imperfect that there is continued metal-to-metal contact during normal operation, any such contact would cause rapid wear regardless of how you operate the engine.

> I would rather observe a reasonable break in than wilfully damage a brand new car.

No argument there. An engine needs breaking in. But if you drive it too gently you're also damaging it.

> I'll go engine brake down a long hill. Thats the way I was taught to do motocross bikes.

That pulls the rings away from the cylinder wall. It's also not in the manual.

> I broke my car in hard (lots of up and down the rev range accellerating and engine braking down hills, but not over 5k rpms very often), and I have had zero oil consumption so far

That's pretty much what it says in the manual you should do. You're probably close to the perfect break-in.
Appreciate 0
      08-17-2007, 06:02 PM   #24
turbodan
Homemade turbo
turbodan's Avatar
United_States
0
Rep
80
Posts

 
Drives: 1988 BMW 528e...
Join Date: Jun 2007
Location: Juarez

iTrader: (0)

Quote:
Originally Posted by Max_! View Post
> Is that how you justify that?
>But they're also not so imperfect that there is continued metal-to-metal contact during normal operation, any such contact would cause rapid wear regardless of how you operate the engine.
Its not necessarily metal to metal contact, its just that the load bearing surfaces of the engine aren't using thier full surface area to support the loads. In extreme cases it could lead to metal to metal contact, which would likey gall and ruin the component. Thats unlikely, but still possible in a new engine.
Quote:
>> I would rather observe a reasonable break in than wilfully damage a brand new car.

>No argument there. An engine needs breaking in. But if you drive it too gently you're also damaging it.
How is a very gentle break in harmful? Enlighten me.
Quote:
>> I'll go engine brake down a long hill. Thats the way I was taught to do motocross bikes.

>That pulls the rings away from the cylinder wall. It's also not in the manual.
Oh really? Prove it.
Quote:
>> I broke my car in hard (lots of up and down the rev range accellerating and engine braking down hills, but not over 5k rpms very often), and I have had zero oil consumption so far

>That's pretty much what it says in the manual you should do. You're probably close to the perfect break-in.
I have to disagree here too. Applying full torque to the driveline during break in is not a good idea.
Appreciate 0
      08-31-2007, 01:00 AM   #25
Hallucin8n
Hallucin8n
Australia
0
Rep
4
Posts

 
Drives: BMW 335i
Join Date: Aug 2007
Location: Australia, Sydney

iTrader: (0)

What is the real definition of running it in hard ? Will it really do damage in the long term if i hit it twice to redline in the longterm ?
Appreciate 0
      08-31-2007, 01:11 AM   #26
e36jakeo
Captain
United_States
12
Rep
624
Posts

 
Drives: 2008 M3 6 Speed MT!
Join Date: Oct 2006
Location: Northern CA

iTrader: (0)

I did European delivery.

Risk = breaking it in hard with 150 MPH autobahn runs at 5200 RPM in 6th gear.

Benefit = 150 MPH autobahn runs and not getting arrested!

Obviously the benefits outweigh the risks
__________________
Driving sideways: It's not faster, but damn it's more fun!
Appreciate 0
      08-31-2007, 05:35 AM   #27
321
Stay a while and listen...
6
Rep
376
Posts

 
Drives: vr4
Join Date: Aug 2007
Location: slo, ca

iTrader: (0)

Quote:
Originally Posted by e36jakeo View Post
I did European delivery.

Risk = breaking it in hard with 150 MPH autobahn runs at 5200 RPM in 6th gear.

Benefit = 150 MPH autobahn runs and not getting arrested!

Obviously the benefits outweigh the risks
:rocks::rocks:
Appreciate 0
      08-31-2007, 12:02 PM   #28
Dascamel
Lieutenant Colonel
Dascamel's Avatar
20
Rep
1,662
Posts

 
Drives: 2008 e92 M3, 2010 e91 328i
Join Date: Jul 2007
Location: Bakersfield, CA

iTrader: (0)

Same here

Quote:
Originally Posted by e36jakeo View Post
I did European delivery.

Risk = breaking it in hard with 150 MPH autobahn runs at 5200 RPM in 6th gear.

Benefit = 150 MPH autobahn runs and not getting arrested!

Obviously the benefits outweigh the risks

+1


Same, I was good until around 500-600 miles, but yeah going to Germany and not having some fun at high speeds would be a shame.
__________________
2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim
2010 E91 328i Space Gray,Black int, M sport, most options
2007 Montego Blue 335i (retired)
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 07:22 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST