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Old 10-12-2018, 09:57 AM   #3581
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Originally Posted by Tango View Post
Actually I did some looking around at off the shelf seals but most are pre-formed to fit a different shape. Also discovered most do not have much in the way of heat rating and my arrangement puts part of he seal an inch or two from the turbo downpipe which gets reeeaaaly warm.


But thanks for the suggestion.


Just got an email that some hi-tech, high heat silicone seal samples are on their way!

Hmm.. I'd think they'd be fine heat wise. The powerstroke version of my bus puts the downpipe within an inch or so of the engine cover. Could always get some DEI heat wrap on that portion of the cover and eliminate the need for the high heat rating. Might make it easier to find the seal you need.
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Old 10-12-2018, 10:02 AM   #3582
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The turbo & downpipe are heavily insulated. I am just prone to way overthinking & overdoing some things!
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Old 10-12-2018, 11:25 AM   #3583
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The turbo & downpipe are heavily insulated. I am just prone to way overthinking & overdoing some things!
Nothing wrong with that. Over-engineering is better than it failing.
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Old 10-12-2018, 03:50 PM   #3584
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Just got word a hi-temp silicone sample is "in the mail". Can't wait to see if it works.
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Old 10-12-2018, 04:43 PM   #3585
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Finally...the paint/temperature test results are in. Including "Pixie Dust".

After way too many cloudy days we had a full day of sun. We are a bit cooler now than mid-summer temps but still plenty of the bright stuff to wrap this up.

Ambient temperature was 86 degrees. Test samples are all 14 ga. steel roughly 2" square.

Each has two coats of paint on one side (Front), raw metal on the other and all are backed with a single layer of Reflectix (Back).

Here are the samples. They are all raised off a base of insulation material by a couple of narrow cardboard strips. I did not want the background material transmitting too much heat into the samples.

From left to right they are...




Sample A: Gloss White
Sample B: Flat White
Sample C: Oil Based pale yellow enamel with factory recommended volume of hollow ceramic spheres (aka; "Pixie Dust") by InsulAdd.




And here is the Harbor Freight Infrared Thermometer used to take the readings.

NOTE: I took readings on both the front and on the rear. Frankly, I am not at all concerned with the outer (Front) temperature. What I wanted to read was how much would be transmitted to the interior (the Back).

Here are the results at 86 degrees F after 1 hour and 30 minutes direct exposure to the sun:


Sample A:
Gloss White......Front: 119.4......Back: 93.2......DIff = 26.4
Sample B: Flat White......Front: 123.2......98.7......DIff = 24.5
Sample C: With color & Pixie Dust: Front:122.7......Back: 91.4......DIff = 31.3


NOTE: The combination of Pixie Dust & Reflectix is what I have been applying and what I wanted to test. I have also applied both materials to the inner panels as well with a 1-1/2" air gap between.


Feel free to conduct your own.
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Old 10-12-2018, 08:48 PM   #3586
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Always the trouble maker. The interesting numbers to me relate to the percent difference you find between the front and back sides of the plates. If you look at those percentages you will find about 6% difference between the most effective (pixy dust) and the least effective (flat white). I'll take a 6% reduction any time so pixy dust it is. The absolute differences (26.4-31.3 are skewed because of the heat reflected by the surface--it is after all how much heat reduction is measured inside the bus that counts.

Damn, it would be fun to be there to play with that stuff! Not having any dust etc I'll just have to continue wiping my brow praying my little AC will finally cool my bus down enough to let me sleep. Jack
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Old 10-12-2018, 09:10 PM   #3587
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My thinking exactly Jack. I will be thrilled if I can reduce the transmitted heat by 30+ degrees.


And if you really want to play with some...I will be happy to mail you a bag (good for 1 gallon of paint). Be my pleasure to have you run your own tests...or paint your roof...or whatever.
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Old 10-13-2018, 08:59 AM   #3588
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Originally Posted by Tango View Post
And if you really want to play with some...I will be happy to mail you a bag (good for 1 gallon of paint). Be my pleasure to have you run your own tests...or paint your roof...or whatever.
Aloha! I'm about to paint my roof; was going to try to get to it this weekend, if the AC units come off cleanly (e-hatch is out already, and I'm really diggin' the skylight! Might add another one or two!)), and I can get it all sanded down and cleaned up... I was going to go with gloss white up there, and your tests seem to prove my assumption on using that, but now you have me interested in pixie dust....

Don't expect you to divvy out your stash to all of us here, so could you please re-inform us (me) as to what the "brand name" of this stuff is, and maybe even where to get it? I started going back through your posts to just find it, but there seems to be quite a few

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Old 10-13-2018, 12:49 PM   #3589
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Quote:
Originally Posted by Tango View Post
Finally...the paint/temperature test results are in. Including "Pixie Dust".

After way too many cloudy days we had a full day of sun. We are a bit cooler now than mid-summer temps but still plenty of the bright stuff to wrap this up.

Ambient temperature was 86 degrees. Test samples are all 14 ga. steel roughly 2" square.

Each has two coats of paint on one side (Front), raw metal on the other and all are backed with a single layer of Reflectix (Back).

Here are the samples. They are all raised off a base of insulation material by a couple of narrow cardboard strips. I did not want the background material transmitting too much heat into the samples.

From left to right they are...




Sample A: Gloss White
Sample B: Flat White
Sample C: Oil Based pale yellow enamel with factory recommended volume of hollow ceramic spheres (aka; "Pixie Dust") by InsulAdd.




And here is the Harbor Freight Infrared Thermometer used to take the readings.

NOTE: I took readings on both the front and on the rear. Frankly, I am not at all concerned with the outer (Front) temperature. What I wanted to read was how much would be transmitted to the interior (the Back).

Here are the results at 86 degrees F after 1 hour and 30 minutes direct exposure to the sun:


Sample A:
Gloss White......Front: 119.4......Back: 93.2......DIff = 26.4
Sample B: Flat White......Front: 123.2......98.7......DIff = 24.5
Sample C: With color & Pixie Dust: Front:122.7......Back: 91.4......DIff = 31.3


NOTE: The combination of Pixie Dust & Reflectix is what I have been applying and what I wanted to test. I have also applied both materials to the inner panels as well with a 1-1/2" air gap between.


Feel free to conduct your own.
Tango, did you purchase the ceramic beads online or here in Houston?
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Old 10-13-2018, 08:22 PM   #3590
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Awesome job on the doghouse! Interesting to see an actual test on the ceramic beads. I wouldn't have thought there would be a difference in reflectivity between gloss and flat white.
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