Powder coated barrel

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nortonspeed

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Previous owner of my recently obtained 850 barrel did a very good job to keep the heat inside :cry:
Any recommendations for the best/easiest way to get all the powder coating off :?:
 
Aircraft type paint stripper will take it right off. Jim

Spray on gasket remover does a pretty good job too.
 
comnoz said:
Aircraft type paint stripper will take it right off. Jim

Spray on gasket remover does a pretty good job too.
Click to expand...

+1 Methylene Chloride is the active ingredient...look for a stripper that has maximum concentration of it. Clean up any residue with MEK

Slick
 
texasSlick said:
comnoz said:
Aircraft type paint stripper will take it right off. Jim

Spray on gasket remover does a pretty good job too.
Click to expand...

+1 Methylene Chloride is the active ingredient...look for a stripper that has maximum concentration of it. Clean up any residue with MEK

Slick
Click to expand...

It seems you can get Methylene Chloride on its own (don't you just love ebay) but paint striper containing it is only for professional use and not to be sold unless you can provide prove of being professional user. So if i used neat Methylene Chloride would it remove paint better than modern paint stripper which is rubbish.
 
Tippy wrote:

"It seems you can get Methylene Chloride on its own (don't you just love ebay) but paint striper containing it is only for professional use and not to be sold unless you can provide prove of being professional user. So if i used neat Methylene Chloride would it remove paint better than modern paint stripper which is rubbish."

Most paint stripper is for little old grannies and wimps... I can get a stripper containing 43% methylene Cl at my Lowes store. Are you in the US? If banned where you are, then use straight methylene Cl in a WELL ventilated area, and use rubber gloves, eye protection, etc.

Slick

BTW.....methylene chloride is a good solvent to weld (glue) plexiglas
 
On another forum I'm on they were talking about powder coating barrels and heads...I asked what they would want to do that for...because it looks cool :shock:
 
dennisgb said:
On another forum I'm on they were talking about powder coating barrels and heads...I asked what they would want to do that for...because it looks cool :shock:
Click to expand...

Looks cool....so they ignore that it runs hot.

Slick
 
Sandblast.

Thick powder coat is a bitch to remove. Even with strippers.
You're gonna have to media blast it anyway after hours of stripping to prep it for paint so why not just use an aggressive media and get it over with. You'll be spending hours with messy caustic chemicals and a lot of scraping between the fins. You'll destroy a lot of brain cells and probably raise your chances of getting cancer.

Sandblast it. It's the only way to be sure.

I've never liked the look of powder coated cylinders. Looks like you dipped the while thing in liquid plastic.
All the details in the casting are gone. Ugh.
I had my Atlas frame powder coated. Looks cheesy but I'm stuck with it now.
It's OK for lawn furniture I guess.
 
I used the methyth Cl stuff to strip very good and thick and hard powerer coat off Peels bones this season and thank goodness it essentially works as praised above, with some time and repeats but nothings perfect and all the cast iron barrel texture will be a bugger if wanting bare metal rather than just clear off the heat blocking thickness and re color with say a have dozen thin weapons coats of your favorite shade looking all the better with some the raw texture smoothed out but weapon coats are so thin can't hardly smooth over a finger print texture. Still plenty of barrels powerder coated do ok if not in some fairly rare extremes. The Black Body Emissions coats are a tad thicker and aid heat expelling or why they keep advertising it.

Powder coated barrel
 
Hobot wrote:

"...... re color with say a have dozen thin weapons coats of your favorite shade looking all the better with some the raw texture smoothed out but weapon coats are so thin can't hardly smooth over a finger print texture."

Best convective heat transfer is achieved if rough texture on cylinder fins IS NOT SMOOTHED OUT. Also best color is flat black for radiation heat transfer.

You does what you thinks is cool, but you risks overheating.

Prof Slick
 
Duh yes smoothness impedes heat flow out down to the nano level till the polish also acts like a mirror reflecting IR back into engine as much or more than visible light outward, so do ya really think its the barrel finish that limits heat flow out instead of the head. Not a big deal to worry over any reasonable barrel paint. I don't believe solvent will get the poweder coat out of cast iron texture especially in fin depths and thin nil interfering coats are so thin the speckles could show thru. I got Peels toxic methyl Cl at a building supply/hardware and was more gel than liguid so tends to stick and layer not splash and drip so pretty safe to mess with if ventalted well.

Maney 920 + Swian's BBEC. Combat head too.
Powder coated barrel
 
Nope, nope, nope.
Air cooled engines do not dissipate their heat by radiation. The heat is carried away by forced convection to the air that flows across their fins. Black paint is only black in the visible spectrum. It's in the infrared spectrum that engine heat is radiated. The color of the fins will have no effect on heat dissipation of an air cooled engine. The black paint does look cool though.

Now absorbing heat (like a solar panel) in the visible spectrum is another story...
 
mschmitz57 said:
Nope, nope, nope.
Air cooled engines do not dissipate their heat by radiation. The heat is carried away by forced convection to the air that flows through their fins. Black paint is only black in the visible spectrum. It is in the infrared spectrum that heat is radiated. The color of the fins will have no effect on heat dissipation of an air cooled engine.

The black paint looks cool though.
Absorbing heat in the visible spectrum is another story...
Click to expand...

BOTH convection and RADIATION dissipates heat from an air cooled engine....radiation is the lessor part but still important. The quantity of heat radiated is a function of TEMPERATURE ONLY (to the fourth power) and the Stefan-Boltzmann constant. The frequency frequency of the light spectrum influences the Stefan-Boltzmann constant.

Black radiates about 3 times more heat than silver or white. This is science....not my opinion.

Reference: Google Stefan-Boltzmann constant.

Prof Slick
 
So then all the black objects in my house should be cooler than the white ones?
When I check them with my infrared thermometer they are all identical.
(OK, i didn't really do this, but I'll wager they are).
 
mschmitz57 said:
So then all the black objects in my house should be cooler than the white ones?
When I check them with my infrared thermometer they are all identical.
(OK, i didn't really do this, but I wager they are).
Click to expand...

No....all the black and white objects in your house are presumably at the same room temp. But heat a black object and an IDENTICAL white object in the oven long enough for both to STABILIZE, then remove, wait 15 or 30 minutes, and check which one will be the cooler. I'll wager you $100 the black will be cooler (or just a beer if you are chicken).

Slick

Where are you located? I'll be over to collect. Ah! I see St Charles, Il.....I'll be there next Sept.
 
texasSlick said:
mschmitz57 said:
So then all the black objects in my house should be cooler than the white ones?
When I check them with my infrared thermometer they are all identical.
(OK, i didn't really do this, but I wager they are).
Click to expand...

No....all the black and white objects in your house are presumably at the same room temp. But heat a black object and an IDENTICAL white object in the oven long enough for both to STABILIZE, then remove, wait 15 or 30 minutes, and check which one will be the cooler. I'll wager you $100 the black will be cooler (or just a beer if you are chicken).

Slick

Where are you located? I'll be over to collect. Ah! I see St Charles, Il.....I'll be there next Sept.
Click to expand...


OK, I call BS!
I accept your wager. What shall we bake?
Do I get to run a cooling stream of air over them like in real world?
I'm not sure your experiment is accurate though.
The 2 objects removed from a hot over are not generating any heat. They are merely cooling off.
Wont the dark object absorb more heat from the oven?
Either way, I'll have some Fat Tire Ale chilling in the fridge, but bring a nice IPA in case you loose.
 
mschmitz57 said:
texasSlick said:
mschmitz57 said:
So then all the black objects in my house should be cooler than the white ones?
When I check them with my infrared thermometer they are all identical.
(OK, i didn't really do this, but I wager they are).
Click to expand...

No....all the black and white objects in your house are presumably at the same room temp. But heat a black object and an IDENTICAL white object in the oven long enough for both to STABILIZE, then remove, wait 15 or 30 minutes, and check which one will be the cooler. I'll wager you $100 the black will be cooler (or just a beer if you are chicken).

Slick

Where are you located? I'll be over to collect. Ah! I see St Charles, Il.....I'll be there next Sept.
Click to expand...


OK, I call BS!
I accept your wager. What shall we bake?
Do I get to run a cooling stream of air over them like in real world?

I'll have some Fat Tire Ale chilling in the fridge!
Click to expand...

Bake any objects you please, PROVIDING THEY ARE IDENTICAL IN SIZE, COMPOSITION, AND SHAPE, only color different. Ensure both come to equilibrium temp in oven by baking long enough.

Blowing air over objects is theoretically irrelevant, but this is an experiment to determine RADIATION HEAT TRANSFER, therefore for radiation test still air is best, and eliminates differences in air flow that might creep in (this is convection effect... not relevant to radiation).

I like my beer in chilled mugs.

See you in Sept. I would prefer you buy me a hot dog and beer at Portillos.

Slick
 
Can't fool me, black surfaces transmit IR radiation better than white, which reflects IR better than black. So fact is a black body will radiate more IR to the air molecules passing by than white. Black body will absorb heat faster than white but both will reach same equal temps over time.

Btw when I mentioned the weapon coat going on a smoother barrel surface that was because I don't think solvent alone will remove powder coat from pore in reasonable calender time interval, so it would be a bit smoother than if sand blasted but just as effective for even racer use in dry desert air up hill with a tail wind.

Holes affect my come up with quandary of removing effect surface area vs exposing more surface area, > just don't make holes much bigger dia. or spaced closer than the thickness of the metal fin.

[video]https://www.youtube.com/watch?v=dn-2THFmyKc[/video]

Another use of methylene chloride in thermal driven engine
[video]https://www.youtube.com/watch?v=apgf8PpVTvA[/video]
 
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