Quote:
Originally Posted by Dizz1e
"Run it hard from hour 0" is wrong - here's why
The "run it hard" opinion hit a resurgence with a website from an air cooled motorcycle mechanic. Aside from the page being focused on motorcycle engines, his hard break in technique for the street only takes the bike up to 65 mph - that's fast for a bike but not much for a car. Bikes are also thousands of pounds lighter than cars so the engine doesn't have to work very hard if you're driving "normally". Some of the misunderstanding is that one person's babying is another's beating. The advice also says that the critical window of opportunity is only 20 miles or 9 dyno runs, then it becomes 200 miles for the street - which is it? It also says that power loss from an easy break in could be up to 10% while the gain in power as a result of using his break in technique could be up 10%. Call me a skeptic - car makers have done full price + taxes buybacks when horsepower was 5% lower than advertised (RX-8) and it's well known that many engines are underrated in their actual power (335i N54).
The engine in your new car really isn't a brand new engine either - it was already tested at the factory, had its first oil change, driven on a dyno at the factory, on/off the transport, and then around the dealership. In some cases the car was driven to another dealer and test driven by other people. Some high performance cars are even driven hard on a track at the factory for quality control. If the first minutes of engine break in determine the rest of engine life and performance, you already missed it.
Engine break in goals are proper heat cycling, mating of parts, and stress reliving accomplished by incremental increases in varying rpm and load. You definitely don't want to baby the engine but you don't want to beat it hard either. The most important goals are avoiding excess engine wear, idling longer than you normally would, steady rpm, and high load on a cold engine."
Taken from: http://www.myturbodiesel.com
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How are you gonna say it's wrong when you don't fully understand what the process involves!
I've used this method on motorcycles that run twice the redline as most cars. The manual is there just in case you forgot how to drive a car or are a female driver!
Basically it's saying for the first 20 miles,
keep the engine loaded and don't bog it, drain the oil to flush out the small fine metal shavings. If you don't have access to a dyno, you can do it on the street.
@ 11:22! They are tested prior to leaving the factory so keeping it under 4K is only there for liability reasons. Sorry to hurt your feelings but you are not the first one to drive you car. Be sure sure to watch the kid who tops your tank off, he'll drive how it's supposed to be driven.
[ame="http://www.youtube.com/watch?v=O_k28mTp0BE&feature=related"]Mercedes-Benz C-Class Production Bremen - YouTube[/ame]
Quote:
Originally Posted by Genomaxter
What people need to know tho is that engineers don't write anything. They dont even draw anything. All engineers do is design, analysis, then trials. Drafters do all the drawings and documentation. Engineers then check all the technical stuff, sign off on it then it gets passed to checking who consult with the lawyers. Lawyers have final say on anything that could cost the company money. Then it goes back to drafting for final drafts.
I know the engineers know what's best, but lawyers could care less and so do stock holders. Was there ever a problem with the first gen 1zz-Fe? Legally no, but they revised the piston design later because it had issues with burning oil due to bad ring design that was hit or miss. That was an engineering call to fix it, but if you ever ask Toyota if there was a problem they will tell you no.
I don't trust lawyers, so I won't trust "advice" on operating procedures. Most of the methods on hard break in call for constant high load, high gear accelerating and decelerating using no high rpms or brakes to slow down. Not exactly advice you want to give to a person who can barely handle a car beyond drivers ed. That's lawsuits material there.
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Technical Writers!