This is probably a heck of a first post, but I need opinions from someone with more oil (and racing engine) knowledge than I have.
Background...383 SBC drag race motor with aluminum heads, approximately 150 passes total, 50 +/- since the last oil change with Brad Penn 10w40 Racing Oil. I just got the results back from my UOA. The additive still look good, phos = 1440, zinc = 1627, moly = 18 and viscosity at 100c = 11.5. The wear metals concern me though. Iron = 341, Alum = 100, and Lead = 1,148, which is my biggest concern and was flagged as "critical" by the UOA lab (Schaeffer's). Is there any way to tell if this indicates excessive bearing wear or could it just be from the lead in the racing gas? I'm guessing the only way to tell about the bearing wear is by tearing it down and inspecting, which I am planning on doing this winter. Just wondering if anyone else out there has noticed high levels of lead in their UOA due to the lead in the fuel and also trying to decide if I should take a chance on running it for the last race of the year. Thanks for any input!
Background...383 SBC drag race motor with aluminum heads, approximately 150 passes total, 50 +/- since the last oil change with Brad Penn 10w40 Racing Oil. I just got the results back from my UOA. The additive still look good, phos = 1440, zinc = 1627, moly = 18 and viscosity at 100c = 11.5. The wear metals concern me though. Iron = 341, Alum = 100, and Lead = 1,148, which is my biggest concern and was flagged as "critical" by the UOA lab (Schaeffer's). Is there any way to tell if this indicates excessive bearing wear or could it just be from the lead in the racing gas? I'm guessing the only way to tell about the bearing wear is by tearing it down and inspecting, which I am planning on doing this winter. Just wondering if anyone else out there has noticed high levels of lead in their UOA due to the lead in the fuel and also trying to decide if I should take a chance on running it for the last race of the year. Thanks for any input!