Forums/Z31P/z31-performance-upgrade-forums driveline-aa/What do you think? Paint transmission?`
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TWA88T: (2013-01-29 00:36:43)
Can't decide.. got it all apart, and as clean as I can, but it still has light and dark areas (aluminum corrosion?) Plus I was thinking that by painting it, that would make it easier to clean up. The bad.. easily scratched when reinstalled… friggin turbo and down pipe are hot as hell.. and if it ends up looking like shit paint would suck to remove from the case.
What say u?
DeleriousZ: (2013-01-29 00:44:39)
bead blast it and hit it with some bedliner lol.
Z_Karma: (2013-01-29 02:26:00)
VHT makes a "Flat Aluminum" ceramic engine paint that would make it look nice.
I'm doing my SS block and heads with it currently.
NissanEgg: (2013-01-29 04:26:57)
What ever you do, DO NOT ceramic coat it. It will make it burn up!!!
Joe87T: (2013-01-29 04:30:55)
powdercoat it
Z_Karma: (2013-01-29 05:21:42)
Hmmmm, I usually prefer a little more meaty detail in a warning followed by 3 exclamation points.
The thermal insulation properties of a thin layer of aerosol paint containing ceramic particles causing a transmission to burn up is debatable.
I would propose that while it is true that a bare surface will dissipate heat the best of any scenario, a layer of paint that could be very well
measured in angstroms, would not offer a huge insulation barrier any more than one covered in everyday road grime.
G-E: (2013-01-29 07:22:01)
If that was true, ceramic coating manifolds would be a total scam…
Now you can also get heat-emitting paint, hell you could even anodize the thing, black hard anodizing helps heat dissipation too
Z_Karma: (2013-01-29 17:57:48)
In my testing that i did as part of my job, hard anodizing (optical black) extruded heatsinks that were cooled by a fan actually performed
slightly worse when compared to their uncoated equivalents. In everyday use, the difference would be marginal but with high performance
LED's, a few percentage points can make a big difference in performance and longevity. They were initially hard anodized for cosmetic reasons.
In the end, it was a cost issue and bare aluminum won. I wouldn't have any issue with painting a transmission.
300zxturboftw: (2013-01-29 18:42:42)
Painted mine with a silver/blue hue flaked high temp heat spray. Sure it's got scratches, but it has held up so far with no issues and keeps the trans clean.
TearingRaven: (2013-01-29 21:42:38)
Why even bother? Seems like more trouble than it's worth.
300zxturboftw: (2013-01-29 21:59:34)
I thought it was cool at the time. It's still cool to me when I get under the trans.
OK85ZX: (2013-01-29 23:01:01)
Because mirror under your car at carshows, obviously.
Z_Karma: (2013-01-30 02:28:27)
I had some alignment techs compliment me on how clean the underside of my black Z was
when they had it up on a rack. In the years that it was off the road because i lacked funds
to fix the motor, i cleaned and painted stuff. Hammerite is durable stuff.
TWA88T: (2013-01-31 04:41:48)
Think that I am going to paint it.. why?? Not for car show mirrors or alignment techs.. more because I try to put things back on my Z that are factory new or better.. Treat it like I was restoring a priceless Ferrari or something.. but mostly so I an drive down the road, and know that there is a shiny new trans there underneath.
Careless: (2013-02-01 03:21:57)
if you have spray that doesn't turn soft when its heated, then use it. its generally a paint with ceramic in some form or another embedded in the enamel. if you are going to clear coat it or try and make it look glossy, then its' just going to get dirty and ugly when you go service it or anything around it.
a nice satin aluminum finish looks great and will make working under the car a bit more "pleasant". and if it's a durable satin finish, you can spray it down with some soapy water before working on it and it will be easier to clean and generally easy to deal with.
i sprayed my lower intake manifold with flat aluminum paint. then i went and cleared it with "compatible' clear. and it only makes it soft and muddy when the engine is warm, which is shitty.
I won't be clearing anything in the future if it's going to come in contact with heat. even if it's 1200 degree clear for 1200 degree engine enamel made by the same chemical/coatings company.
TWA88T: (2013-02-09 18:48:08)
More better…
Careless: (2013-02-09 21:34:21)
thats mo' like it.
frostvectron: (2013-03-25 15:37:26)
Anyone know how hot the trans and diff pumpkin get? Is high temp paint needed?
1artworkz: (2013-03-25 17:45:32)
PAINT TECH: Painting a transmission,
Two of the most common reasons to paint any surface are; protection and appearance.
Heat emissivity (the ability of a surface to emit radiant energy) is another one.
Check http://tdmginc.com/fea_cfd_emmissivities.html for details.
Black surfaces emit more heat than bright shiny surfaces which are good at reflecting heat.
Formula 1 transmissions are black anodized.
The operating temperature of a daily driver standard transmission is 160 to 190°F.
A thick coating of a silver paint potentialy could raise the operating temperature of the transmission a couple degrees.
Aluminum transmission tend to easily discolor due to their rough surface and chemical contact.
Any coating will seal the surface and provide an easily cleanable surface.
Proper surface preparation is the key to a long lasting durable coat.
Coating aluminum requires specialized coatings due to the aluminum oxide which forms on the surface as soon as the aluminum is exposed to oxygen.
http://www.awlgrip.com/support-and-a…-aluminum.aspx
Powder coatings are the most durability.
Ceramic coatings require oven curing at 500°F and not advisable for aluminum.
Epoxies have the best adhesion to untreated aluminum surfaces but will yellow in sunlight..
Acrylic (poly) urethanes are non yellowing and and have good surface durability, second to Powder coatings
VHT Polyurethane Wheel Paint would be a good choice as it has good adhesion to aluminum and a maximum operating temperature of 250°F.
Also, look at VHT Metal Tint.
frostvectron: (2013-03-25 19:59:29)
Ah very helpful, thanks! I had painted my diff pumpkin with regular rustoleum black paint just to protect it from the elements.
I didn't even think about it getting too hot for the paint. Not sure if I should strip it and repaint it or just leave it as is.
G-E: (2013-03-25 20:13:33)
Leave it until it's a problem, stripping now vs later won't save you any work heh
frostvectron: (2013-03-25 20:27:30)
Perhaps. Though this diff is out of the car right now… but I'm inclined to think that it should be okay.
james: (2013-03-26 23:48:24)
Dupli Colour Ceramic Black 1200F engine paint is really good in these situations.
When not used on an engine or something that gets really hot it can be baked on with a heat gun or torch. I find it sticks to cast surfaces really well.
here is a sample of the finish on both alloy and cast iron
[archived image: DSCF3516800x600.jpg]