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Why I support Nissan's break in period period

Yes, another thread about the break in period. HOWEVER, I hope to shed an educated light on the debate. I work as a reliability engineer. A what? An engineer concerned

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Old 04-15-2014, 08:50 AM   #1 (permalink)
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Talking Why I support Nissan's break in period period

Yes, another thread about the break in period. HOWEVER, I hope to shed an educated light on the debate. I work as a reliability engineer. A what? An engineer concerned with prolonging equipment life for an industrial plant. I've had training/certification in lubrication analysis, vibration analysis, infrared, bearings maintenance, electric motors, etc.

Nissan recommends the following:
During the first 1,200 miles follow these recommendations to obtain maximum engine performance and ensure the future reliability and economy of your new vehicle.

Avoid driving for long periods at constant speed, either fast or slow.
Do not run the engine over 4,000 rpm.
Do not accelerate at full throttle in any gear.
Avoid quick starts.
Avoid hard braking as much as possible

I agree with Nissan's 'slow and steady' break in period. Here's why. When breaking in an engine, it is really not likely that internal machine tolerances are THAT out of wack; Nissan has probably gotten pretty good at machined parts and fitment. If there are any slightly off spec tolerances, you would want them to wear in gently and evenly. A gentle break in period allows for this. If you run the engine like you stole it, you risk inducing stress concentrations in machined parts and microscopic fatigue/cracking in the metal. This fatigue will NOT be noticeable for quite some time. But give it thousands of miles and a couple years, and those cracks propogate; fatigued metal begins to spall (tiny chunks break off). Other engine parts need to wear themselves in as well, such as bearings. Again, there should be no unreasonable machine tolerances in a new engine. But machining processes are not perfect, so tiny imperfections may exist, and a gentle break in period allows components to wear in in a 'safer' manner.

"If you don't run it hard, you won't seat your rings and you'll lose power"
Honestly, I do not know about specific engine parts, nor have I worked on them. But I find it hard to believe that one must run an engine hard to get the (piston?) rings to seat properly.

"Gentle break in promotes carbon buildup! It'll kill your engine"
I HIGHLY doubt that a new engine will have ANY carbon deposits after 1,200 miles. If it does, we're talking about MINUTE amounts that will dissipate from spirited driving after the break in period. Unless you're just using absolute crap for gasoline (and I mean ABSOLUTE crap). Not to mention carbon deposits occur over time and are largely influenced by the maintenance you perform on your engine over its life.


Just my two cents Hope it's informative to some.
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Old 04-15-2014, 08:55 AM   #2 (permalink)
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Now we sit back and wait until someone posts that old mototune article about breaking in motorcycle engines that says to beat the hell out of them early and often.
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Old 04-15-2014, 09:05 AM   #3 (permalink)
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Inb4
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Old 04-15-2014, 09:06 AM   #4 (permalink)
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It's funny how engineers always support the breakin period, and guys who read stuff on the internet will tell you that breakin periods don't matter.
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Old 04-15-2014, 09:34 AM   #5 (permalink)
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Quote:
Originally Posted by Chuck33079 View Post
Now we sit back and wait until someone posts that old mototune article about breaking in motorcycle engines that says to beat the hell out of them early and often.

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

?
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Old 04-15-2014, 09:37 AM   #6 (permalink)
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Yep. Doesn't everyone usually get all of their info from badly designed websites from the early 2000s rather than the engineers who designed the vehicle?
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Old 04-15-2014, 10:38 AM   #7 (permalink)
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Interesting - I did not know about the crosshatch pattern on cylinder bores to profile the piston rings. I noticed the website mentions that the first 20 miles are most critical to overall engine life. I picked my car up with 24 miles so... guess it doesn't matter?! In addition, I have a problem directly comparing motorcycle engines to car engines. Yes, they're the same concept.. but can one honestly assume that what's good for a bike is good for a car? 14,000-16,000RPM redline vs. 7500RPM redline? Different weights of the mechanical components, different pressures, etc. The website does offer compelling evidence though. The debate lives on... I'm sticking to my guns though

EDIT:
Something else I just thought about. Here in the industrial plants we have high speed gearboxes all over the place for equipment. Any of you that have replaced transmission/differential oil have probably wiped off the metal shavings that collect on%

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Old 04-15-2014, 10:44 AM   #8 (permalink)
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That article is highly questionable as far as I'm concerned. I just posted it to head off the people who believe it. To confuse the issue more, who still changes the oil after the breakin period? I always do. The metal from the breakin process has to go somewhere, right? But I don't see this recommended anymore.
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Old 04-15-2014, 10:52 AM   #9 (permalink)
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Just out of curiosity, and since I don't have my manual with me, does the manual specify a break in period? Is it part of the dealer checklist when selling the car? (not that the dealers know jack crap about our cars)
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Old 04-15-2014, 10:52 AM   #10 (permalink)
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I support the recommended break in

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Old 04-15-2014, 10:53 AM   #11 (permalink)
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1200 miles per the manual.
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Old 04-15-2014, 11:04 AM   #12 (permalink)
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I read somewhere that the GTR motors are run wide open for an extended period of time before install, does anyone have a link that supports this?
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Old 04-15-2014, 11:51 AM   #13 (permalink)
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Quote:
Originally Posted by Infidel View Post
I read somewhere that the GTR motors are run wide open for an extended period of time before install, does anyone have a link that supports this?
I hear a similar thing for all corvette engines.
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Old 04-15-2014, 12:27 PM   #14 (permalink)
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Back in 2003, when I purchased new a Sentra SE-R, I broke it in leaving the dealer lot , bouncing off the rev limiter going down the street.

6 years and 103,000 miles later, I traded it, in perfect running condition.

I'd be more inclined to believe the 'break in period' with first hand experience and not what others say.

Now with the Z, i've given it more of a gentle approach, but I chalk that up to age...
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Old 04-15-2014, 12:34 PM   #15 (permalink)
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Quote:
Originally Posted by InnerDragon10 View Post
Yes, another thread about the break in period. HOWEVER, I hope to shed an educated light on the debate. I work as a reliability engineer. A what? An engineer concerned with prolonging equipment life for an industrial plant. I've had training/certification in lubrication analysis, vibration analysis, infrared, bearings maintenance, electric motors, etc.

Nissan recommends the following:
During the first 1,200 miles follow these recommendations to obtain maximum engine performance and ensure the future reliability and economy of your new vehicle.

Avoid driving for long periods at constant speed, either fast or slow.
Do not run the engine over 4,000 rpm.
Do not accelerate at full throttle in any gear.
Avoid quick starts.
Avoid hard braking as much as possible

I agree with Nissan's 'slow and steady' break in period. Here's why. When breaking in an engine, it is really not likely that internal machine tolerances are THAT out of wack; Nissan has probably gotten pretty good at machined parts and fitment. If there are any slightly off spec tolerances, you would want them to wear in gently and evenly. A gentle break in period allows for this. If you run the engine like you stole it, you risk inducing stress concentrations in machined parts and microscopic fatigue/cracking in the metal. This fatigue will NOT be noticeable for quite some time. But give it thousands of miles and a couple years, and those cracks propogate; fatigued metal begins to spall (tiny chunks break off). Other engine parts need to wear themselves in as well, such as bearings. Again, there should be no unreasonable machine tolerances in a new engine. But machining processes are not perfect, so tiny imperfections may exist, and a gentle break in period allows components to wear in in a 'safer' manner.

"If you don't run it hard, you won't seat your rings and you'll lose power"
Honestly, I do not know about specific engine parts, nor have I worked on them. But I find it hard to believe that one must run an engine hard to get the (piston?) rings to seat properly.

"Gentle break in promotes carbon buildup! It'll kill your engine"
I HIGHLY doubt that a new engine will have ANY carbon deposits after 1,200 miles. If it does, we're talking about MINUTE amounts that will dissipate from spirited driving after the break in period. Unless you're just using absolute crap for gasoline (and I mean ABSOLUTE crap). Not to mention carbon deposits occur over time and are largely influenced by the maintenance you perform on your engine over its life.


Just my two cents Hope it's informative to some.
My understanding was also to allow for lots of coast down during break-in to induce extra vacuum and seat the rings better.

Other than that, your break-in rationale makes sense, and is one I have always followed with any new motor.
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