Took it out for the maiden voyage...
Break-in per Jeep 4.0 Rebuild by Larry Shepard.
Good book, but I wasn't comfortable with his target RPM ranges. This is excerpts from the book
Phase 1: For 30 min ~ do not use full throttle and try to limit the engine speed to 3,000 rpm or less. During this time, try to vary the engine speed
P2: For the next 30 minutes, move the engine limit up to 3,500 to 4,000 rpm and...
P3: For the next 30 minutes, use the new RPM limit of 4,000 to 4,500 rpm and use varying throttle applications from light to medium to full...
P4: For the next 2.5 hours of engine operation, the engine assembly is considered broken-in and you can begin to run the vehicle normally...
...I kept P1 under 2,000 / P2 under 3,000 and then a couple 4,000 bursts.
It just didn't feel like I was getting enough fuel over 4,000 to run well. I'll have to take it to a tuning guru after a couple oil changes.
****Love any thoughts and feedback from those that have done engine rebuilds on their break-in experience****
Otherwise, ran like a dream. Smoother than before. Power. Happiness till the next project.
~ upgrade breaks all the way around + double diaphragm boost.
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