At 04:10 PM 3/18/2003, you wrote: >This comes as a suprise to me. My understanding is that with newly >honed cylinder walls, the friction and heat generated the first time the >engine is run is greater, and therefore should only be run at an idle >for the first bit of it's break-in.
The 2000RPM for 20 minutes thing is all about cam/lifter break-in. The cam and lifters want LOTS of oil until they get somewhat seated in to each other. One of the worst things you can do is let an engine idle a lot during cam break in. Those first few minutes of a cams operational life determine a lot about how long it will last... After the cam break in, change the oil and then drive it mostly llike normal, but take it a little easy on the RPM's and especially don't lug it for the first 1000 miles. I usually change the oil after cam break in, again at 250-300 miles and again at 1000 miles. Normal oil change schedule and driving habits after that. Cheers, Steve |
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