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Re: Engine Break in question
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How do you come up with this?
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About 50 years worth of reading, reading, reading, understanding, then reading some more. Growing up on a farm in the 1940s and 1950s under the tutledge of an excellent instructor - my father. And reading papers and journals of engineers and scientists, not ramblings of good ole boys. And being a lot smarter than the average bear. [img]/ubbthreads/images/graemlins/wink.gif[/img]
Did you read Diesel Jay's article? Most of my technique for breaking in a brand new pickup while on a freeway trip is based on Jay's comment: "3. DO drive the engine at varying RPMs and speeds until about 1000 miles. The idea is to alternately heat and cool the rings under varying RPMs."
But take that a step farther and you want maximum throttle-off deceleration without using the brakes. That helps the cooling of the rings Jay mentions. That's why you want to take every exit when forced to drive on the freeway during the first few hundred miles of breakin. And that's why I said that city traffic is the perfect condition for breakin, but if you have to get on the highway, then simulate city driving as much as you can without getting run over.
That's why with a 70 MPH speed limit, about 55 MPH is the slowest you want to cruise. You'll get slower speeds (and RPM) at each exit. And the "ticket limit" is usually 74 MPH, so that's the max speed you want to cruise at.
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