Quote:
Originally Posted by Dezoris
At 14 miles, let it warm up. Took it on an open road and slowly worked up the engine speed in 3rd gear all the way to redline and let it slowly drop down. Wash rinse and repeat. All over the rev range varying loads. for the first 500 miles then dumped the oil.
I never understood why you need to break in a motor for 1000 miles by keeping RPM down? Maybe they go under the assumption people are not going to change that oil for 5000-7000 miles?
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You must keep the rpm low for your break in period; as RPM or radial velocity increases (w), your acceleration (a) is increased as a square. a=w^2*r. Remember from physics, F=m*a? The higher the rpm, the higher your con rod's and pistons have to accelerate to get from TDC to BDC. This in turn creates excessive force on your crankshaft bearings. This force slams the unworn-in bearings and creates terrible form-ability between the crank journal and bearing. Your bearings need to form to the journals uneven surface to properly allow a thin film of lubrication to separate the two surfaces.
It is imperative that you wear in your bearings properly first or else you can cause a majority of problems. This also goes for the rest of your engine. This is why they specify you to maintain an rpm below a set value in the operating manual. See this link below for info on bearing wear problems, I hope this scares anyone from neglecting the advice of the manual...Your car may run fine for the first 30k but it can lead to a host of problems in the long run if you don't "wear-in" your car properly.
http://www.bobistheoilguy.com/bearin...aranalysis.htm