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Quote:
Originally Posted by supereal
At our shop we do a run in on all rebuilt engines in our test jig. We use Shell Rotella oil to protect the new bearing surfaces with extra zinc, and hold a steady speed to aid the bearing surfaces until they are run into tolerance. High revs of a tight engine will cause
serious damage.
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Running it in without a load for too long will keep the rings from properly seating. They need the heat/cylinder pressure to properly break in, and not just glaze over. Improper break in on the rings will keep the cylinder from ever sealing properly. You'll see a lot more blow-by.
High rpm and low load is the worst way to do it. Moderate load and rpm is key. A test stand is good for initial warm up, and to check for leaks, issues, etc. But, the engine needs installed in a vehicle and put under load as soon as possible for best results.
The guys in the videos are at the top of their field. I'm not just stating my opinion... I'm relaying good advice from those who know best.
Good Luck