What is up with the tip of my new rotor? (1 Viewer)

[bdsmitty88]

Didn't think much of it when I first got it, as it looked intentional, but the more I troubleshoot my vehicle the more I want to check every box. I bought this rotor new like two months ago. I've seen uncoated rotor tips and fully coated rotor tips, but never one that is partially coated like mine...and in different directions depending on side.

1. Why is this abrasive coating (feels like stone) on the tip front, anyway?
2. Could it cause problems only being partially covering and do we think this was intentional?

TIA!

 

[firemanj92]

Coating is normal but yours appears to be half chipped off. It's a conductive coating/to reduce spark scatter/RFI suppression and prevent erosion. The rotor will work without it but it will probably wear faster.

 

[73FJ40]

Post #8

OEM Painted Rotor

Did a routine plugs, wires, cap & rotor PM. Seems toyota had a cap & rotor, one box store had plugs, another box store head wires. The rotor that I got directly from Toyota had a dab of some kind of paint on the tip of the rotor where it should be sending the spark to the cap & wires. I tested...

forum.ih8mud.com

 

[Malleus]

Just in case anyone wants to add the patent to their collection...