HI!
For the paint on the friction surfaces of the rotor, I do confirm that I am talking about a bit
of overspray. But I do confirm that I also paint the inside surfaces of the rotors
(the vents in between the two friction surfaces).
The theoric glazing that gizmotoy warns about is non existant: the resistance of the paint,
compared to the hardness of the rotor and pad materials makes it to be removed very very
quickly. Normal wear of the pads will also remove any paint that could be incrusted on the pad surface.
On the aspect of the thermal resistance brought in by the paint: I do think that it is extremely
minimal. A painted car will take the ambiant temperature. If paint was a so good thermal insulation,
there would be noticeable temperature differences between the inside of a car and the oustide ambiant
temperature. What is the R factor of less than 1 mil of paint???
For the sake of scientifically backing my point that paint is not a thermal insulation I would like to
present to the reader this technical report from the cold climate housing research center on tests made
on insulating (supposedly) paint...
http://cchrc.org/docs/reports/Insulating_Paint_Final.pdf
Please take a read on this interesting piece of information above.
If you have a different opinion, I would appreciate you back it up with some scientific data/reports/experience.
For the pictures of the Tesla S rotors, I will have my friend come visit me friday. I will be able to take pictures
on both sides, through the wheel, and repost back. One will be able to appreciate the difference of rusting between
the two rotors.
For the pictures on my Volt, you can take a look at this article:
http://roulezelectrique.com/la-corrosion-de-2-metaux-differents/
The pics were taken in november 2012, before and right after painting application.
On can see the light overspray on the rotor. This overspray is long gone.
My friend's Tesla is used extensively. He did also participate on a electric car acceleration
day event at Montreal's Icar, and the brakes, althrough abused, did function normally.
Because the rotor is made of steel, and the wheel is made of aluminum, there is galvanic
corrosion taking place. Especially in salt country - Montreal is the best for salt!
To avoid this, I placed a gasket of dielectric material in sandwich between the wheel and the rotor on my Volt.
it's about 2 mills thick.
I also replaced the steel nuts of my Volt by aluminum nuts. The results against corrosion are impressive:
there is none! (Please take note that Porsche uses aluminum lug nuts since the `90s).
You can take a look at pictures before and after on page 1 and 4 of this post:
http://gm-volt.com/forum/showthread.php?21922-Wheel-corrosion-because-of-two-different-metals-...
When I presented my solution, I also got some doomsayers comments.
Well, none of the predicted catastrophies did materialize.
And rotors are still nice, shiny and... rust free!
Francois
B2653