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  #21  
Old 09-20-2012, 08:56 PM
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hm not really any thing that proves it, but if you search you'll find just about every major manufacturer(all that I can think of) does.

From a google search(wikipedia):

"break-in is now done at the factory, obviating end-user break-in. This is advantageous for several reasons. It is a selling point with customers who don't want to have to worry about break-in and want full performance "right out of the box". And it also aligns with the fact that compliance rates are always uncertain in the hands of end users."
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  #22  
Old 09-20-2012, 09:16 PM
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[QUOTE=Red-Stripe;893249]
Quote:
Originally Posted by snrusnak View Post
New car engines are broken in before they are ever put into the car, so no need to really worry about it. QUOTE]


Really? Do you have anything to post that shows that?
In general, people no longer break in the engines of their own vehicles after purchasing a car or motorcycle, because the process is done in production. It is still common, even today, to find that an owner's manual recommends gentle use at first (often specified as the first 500 or 1000 kilometers or miles). But it is usually only normal use without excessive demands that is specified, as opposed to light/limited use. For example, the manual will specify that the car be driven normally, but not in excess of the highway speed limit.


http://www.popularmechanics.com/cars...k-in-a-new-car

http://en.wikipedia.org/wiki/Break-in_%28mechanical_run-in%29

Last edited by Asur; 09-20-2012 at 09:20 PM.
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  #23  
Old 09-20-2012, 10:01 PM
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My buddy has an 09 Tacoma and his manual said 3000 miles for break in.
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  #24  
Old 09-20-2012, 10:33 PM
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That's because toyota sucks...

Really all engines from a major manufacturer are "broken in" before the car hits the lot. Not that the first say 500 or 1000 miles doesn't play a role in performance and longevity(it does), but it's not critical or required like it used to be back years ago.

The main thing for "break in" is to have high cylinder pressure. This does not mean baby the car or beat it, but basically high throttle at low to mid rpms. This seats the rings. Rings are not seated by "springing" pressure, they are seated by cylinder pressures pushing them outward. Proper break in is extremely important for seating rings. This, however, is basically all done by the time you get the car.

Just drive it normally. Don't baby it, don't beat it. Don't let it idle for a long time. Don't set cruise control and hold steady rpm on the highway for 4 hours right off the lot. Varying rpms will help.
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Old 09-20-2012, 11:01 PM
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The salesmen when they take customers out on test drives tell people to get on it and feel the power. I personaly dont agree with this practice but that is what happins so chances are its allready been beaten before it evin left the lot unless yours had 0 miles mine had 7 when i bought it
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  #26  
Old 09-20-2012, 11:18 PM
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^that's probably good though. If they are giving it 1/2 or 3/4 pedal half way through first gear that will give high cylinder pressure and promote good ring seating.

If they are flooring it to 100mph well then yeah that's not good lol.
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  #27  
Old 09-24-2012, 06:01 PM
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Many engine builders believe low rpm/higher torque is bad for break-in, and that higher revs, with less torque is best( me included). That being the case, breaking in in tow/haul mode, or with the shifter set to 5, should satisfy that requirement if you drive on the highway with the new engine.
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  #28  
Old 09-24-2012, 06:12 PM
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How do you figure higher rpm = less torque?

Tow/haul mode only changes transmission shift points, nothing with the engine.
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  #29  
Old 09-24-2012, 06:46 PM
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Quote:
Originally Posted by Red-Stripe View Post
Many engine builders believe low rpm/higher torque is bad for break-in, and that higher revs, with less torque is best( me included). That being the case, breaking in in tow/haul mode, or with the shifter set to 5, should satisfy that requirement if you drive on the highway with the new engine.
That is for a freshly built Engine, in production, they run them through to check for any defects, check tolerances etc. Something a Local Engine build cannot do. All my Racing engines had to be broken in before racing the car. This is a normal thing, but now Manufactures don't want the user to break it in, cause most don't even read the manual, let alone break in the engine properly. This way they have control on how it is done, and that it was done right, same thing with the encrypted ECU its all so that at the end of the day, it cost them less because there are a ton of idiots out there who can't even read that manual.
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  #30  
Old 09-24-2012, 07:41 PM
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Quote:
Originally Posted by snrusnak View Post
How do you figure higher rpm = less torque?

Tow/haul mode only changes transmission shift points, nothing with the engine.
Are you serious?
Lower gear ratio at a given mph is higher rpms, lower torque on the crank.
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