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  #1  
Old 11-23-2013, 11:37 AM
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Break in question

I have about 7500 miles on my 2014 GC and followed the jeep recommended breakin in the manual. a friend is getting a 2014 X5 and I was comparing the break in recommendations of the two.
.
2014 Jeep states
"While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in."

2014 BMW states
"Avoid full load or kickdown under all circumstances"

Anyway I know breakin periods are not as important now a days as they were years back and always follow what your ownwers manual says but I found if funny that the two manufactures have two completely opposing statements on break in. BMW use of turbo chargers have anything to do with it? don't know, no biggie just found that weird
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Old 11-23-2013, 06:16 PM
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Re: Break in question

BMW is covering their butt. Jeep owners are smarter
All jokes aside, I suspect it has more to do with the valve train materials. Engine break in is done within the first couple hundred miles. Valve seats take more time. There are also other things like tranny and differential gears to seat.
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Old 11-23-2013, 06:34 PM
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Re: Break in question

Quote:
Originally Posted by The Evil Twin View Post
BMW is covering their butt. Jeep owners are smarter
All jokes aside, I suspect it has more to do with the valve train materials. Engine break in is done within the first couple hundred miles. Valve seats take more time. There are also other things like tranny and differential gears to seat.
I guess, just seems strange to be on two opposite ends of the spectrum like that. I do agree more with Jeep with the occasional tromping on it which is what I did for my break in.
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Old 11-23-2013, 07:09 PM
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Re: Break in question

I've had my fair share of experience with engine builds. The thing that really makes the difference is cylinder loading and heat cycles. I would call it "spirited" acceleration. Not necessarily WOT romps on the stupid pedal. Doing so increases cylinder pressure pushing against the rings and valve seats. That goes for any engine, any material block or heads.
The gear faces are a different story. Gears can take several hundred miles to go through the "work hardening" process. Essentially, forging the metal under heat and load to complete the finished faces of the gear. Too hot and the metal gets brittle and not hot enough can leave pitting.
Anyway, done geeking out but that is why I suspect drive train and not engine for the difference.
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Old 11-23-2013, 07:45 PM
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Re: Break in question

Quote:
Originally Posted by The Evil Twin View Post
I've had my fair share of experience with engine builds. The thing that really makes the difference is cylinder loading and heat cycles. I would call it "spirited" acceleration. Not necessarily WOT romps on the stupid pedal. Doing so increases cylinder pressure pushing against the rings and valve seats. That goes for any engine, any material block or heads.
The gear faces are a different story. Gears can take several hundred miles to go through the "work hardening" process. Essentially, forging the metal under heat and load to complete the finished faces of the gear. Too hot and the metal gets brittle and not hot enough can leave pitting.
Anyway, done geeking out but that is why I suspect drive train and not engine for the difference.
They both have the similar ZF 8 speeds so more the differences in the transfer cases and differentials? is what's driving that you think?
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Old 11-24-2013, 09:03 PM
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Re: Break in question

It could very well be a laundry list of reasons. Besides gear faces there are axle shaft splines, bearings (thrust/ roller/ taper/ needle/ ball) and such. There is also a difference in power output between engines to consider.
In short, the manufacturer knows what needs to be done and how.
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