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Old 05-27-2020, 09:08 AM   #11
Bob Gullett
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Default Re: Piston Skirt Recoating

Just was at the dyno Monday with a friends bracket motor. 383 SBC. The guy who did the motor used pistons with Line2Line coatings. All the clearances and assembly and break in was done as per the instructions from Line2Line. Horsepower was down. Changed oil 3 times and oil was black from the coating and the filter had coating material in it. Leakage ranged from 9-55%. Going to tear it down in the next couple days to see the reason but I'm sure the rings are damaged or gummed up from the coating.
68 Chevy11 327 F/S
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Old 05-27-2020, 11:32 AM   #12
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Default Re: Piston Skirt Recoating

That is sad to hear. I was doing a leak down on one of my cylinders which showed 20%. I disconnected the air line then plugged it back in, heard a little pop and now it was at 2%. This happen again on another cylinder. I drained the break in oil and cut open the filter. I did not see any thing plugging the filter but on one of the runs, the oil pressure dropped to 30 at idle with the break in oil. I poured 2 quarts of 5-20w mineral oil in and let it flush out the pan. I sprayed each cylinder with Marvel Mystery oil in hopes it would loosen up the sticky rings. Had nothing to lose at this point. Installed new filter and Lucas 10-40 semi-synthetic race oil and started the engine, ran to 140 degree water temp. The blow by was significantly reduced. Have not checked the lead down yet since I do not think the engine if fully broken in. Don't have much fuel.
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