I did some playing today. Comparing side-to-side with two different paints. One I suspected wouldn't work, the other I hoped would work.

Top left corner is typical automotive paint. Any lacquer or enamel will have the same effect. It was an obvious negative effect on the ability of the SC to cool down. Test ran from 350 to 100 degrees.

Bottom right is something I may consider trying in the future. Results were positive on that one. But I won't tell you what it is until I see how it performs and holds up on the car.

Long story short, I'll get data up sometime later tonight.

Fried Supercharger for dinner?

I'd like to see what paint that is on the bottom right. Looks promising.

Supercharger (scrappy dude good for nothing but a paper weight) heated to 350 degrees F. Initial temp taken on all four quadrants.

Further data taken in 5-minute intervals only comparing top to bottom on each half (for thermal mass variation). Comparing OEM Eaton paint to 2 different options.

Oh wow. That is quite interesting. Is it a everyday paint you can buy in the local hardware store?

Until I test it, you must find a brass lamp, rub it, and ask the Genie for some.

Point #1:

I'm not going to let this out (this is strictly between another member and myself for the time being for specific techincal reasons) only to find out 3 of you impatient bastards jump on it, only to find out that it flakes off after multiple heating/cooling cycles or engine degreaser, or the fumes of it outgassing kill you and your car'* occupants as the climate control sucks in noxious fumes.

Point #2:

I don't know how this finish compares to the uncoated M90. I have my theories, but they're unproven until I get my hands on a scrap M90 housing, or strip the paint off my scrappy M62 bitch.

Further thoughts now that I'm sitting here looking at it. When fully assembled, the SC can't cool from the inside out like it could in my kitchen. The seperation between the data in both graphs would probably be even greater on a fully-assembled SC. I may have to slap a set of rotors in this one and test it again.

Too add to the complexity.. our chargers heat from the inside out more than throughout. The true test won't happen until Bill gets the charger on his car and gives it an honest true testing.

Dead on the money, boosty. I can simulate it somewhat in the oven with rotors installed, but there are still alot of unanswered questions. How will it hold up, will it outgas under heat, can it handle engine cleaning, etc. I'm almost tempted NOT to do it, as this will be my 'hybrid' supercharger I'm doing it to.

I gotta know for sure though.

Isn't the M62 coated differently than the M90? Would this affect results?

What about some of the aftermarket roots blowers that come painted black or with a high polish coating?