I just replaced the cylinders on my IO360 200hp. I am now running ECI Freedom remanufactured cylinders with the nickel/graphite (Cermanil) bore. The cylinders came with break in instructions that say to use 65-75 percent power until oil usage stabilizes. I have 5 hrs on the cylinders now and the rings have not seated. The CHTs have not exceeded 370 degrees. I am wondering if I should now run at max power to seat the rings? That is the way I have broken in steel cylinders: run at max power with CHTs in the 400-450 degree range until the CHTs drop. The only problem is that by running at the high CHTs, the cylinders may glaze and the rings would never seat. Alternatively, I can continue to run at reduced power and hope that the rings seat. These cylinders supposedly have an easy break in. Anyone that has experience breaking in cermanil cylinders please chime in.
John Henley, RV7
John Henley, RV7