'46 Chevy Shorty - Page 180

Mr4btTahoe · 10-12-2018, 10:57 AM

Quote:

Originally Posted by Tango

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.

Tango · 10-12-2018, 11:02 AM

The turbo & downpipe are heavily insulated. I am just prone to way overthinking & overdoing some things!

Mr4btTahoe · 10-12-2018, 12:25 PM

Quote:

Originally Posted by Tango

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.

Tango · 10-12-2018, 04:50 PM

Just got word a hi-temp silicone sample is "in the mail". Can't wait to see if it works.

Tango · 10-12-2018, 05:43 PM

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.

ol trunt · 10-12-2018, 09:48 PM

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

Tango · 10-12-2018, 10:10 PM

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.

Mountain Gnome · 10-13-2018, 09:59 AM

Quote:

Originally Posted by Tango

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

Phatman · 10-13-2018, 01:49 PM

Quote:

Originally Posted by Tango

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?

roach711 · 10-13-2018, 09:22 PM

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.

Tango · 10-13-2018, 09:29 PM

Howdy All --- found mine online (cheapest). Brand name is "InsulAdd". After some homework I found they were the original NASA partner in the development of this stuff. Others out there now but I figured, hey...they came up with it...so support'em. You can find it now on Ebay and Amazon. Just cruise prices & shipping for the best deal. Not at all expensive. Like $14 bucks for a gallon batch.

Since there was no way I was gonna pull my interior panels, (long story)...I figured take whatever reduction I could. I should think combined with "real" insulation, you would see a really significant drop in transmitted heat and/or stabilization of interior temps.

Tango · 10-14-2018, 07:15 PM

Happy Sunday All! --- (just another workin' day here) Got a few small-ish tasks taken care of today before heading for the bar.

My driver side window panel is finally back in place. SO many little things involved in getting here I can't even begin. But...the window goes up and down and that makes me happy! NOTE: This window never went ALL the way down. Stops with about 3" still up (???). But nice to be able to roll it. Still need to find an escutcheon for the crank but that should be easy.

And...

...spent much of the day re-re-re-reinstalling the dash and shifter. GAWD I hope this is the last time!!! This sucker has been in & out so many times I can do it in my sleep...but have no desire to revisit that nightmare.

Also...

...managed to fit a wiper along the outside edge of that window. Cannot imagine what the designers at Wayne were thinking here. This thing had a gap on the outside that ranged from 3/4" at one end to maybe 1/4" at the other. Water POURED in...with no place to go! Hence all the stainless stuff with a drain I built to go inside this panel.

Finally...

...some windchimes. Actually, these are the roof deck uprights. A dozen of them. Couple of coats of Hammerite and some plastic plugs in each end. Can start laying on the deck main frame now.

ONWARD!

cadillackid · 10-14-2018, 08:36 PM

lookin good!! how do you take the doghouse off with the shifter there? why cant allison make smaller shifters!heck its just pullin a cable in and out like a bicycle shifter...

-Christopher

ol trunt · 10-14-2018, 09:17 PM

Hey Tango. I'd say your progress is happening by leaps and bounds. Wish I had put my shifter on the right where yours is. Mine is on the left next to where our "E" brake is. I grimace every time I have to squeeze the button to change gears because it lights up my left wrist--broken in a bike wreck at work years ago. The City smugly provided me "lifetime care of the injury" knowing full well there was no way to fix it. Ha!

6 PM here and I finally made it to the bar. At home. I spent the weekend locating and repairing a very small propane leak. Neither of my propane sniffers thought it bad enough to start squalling--but I could smell it. After pulling out an entire side's worth of upholstering, draining and raising my 60 gallon fresh water tank I finally found the leak. It was in one of the original donors connections in the low pressure side of the propane system. It didn't leak when I installed it so I left it alone. I should have checked more closely. The leak was the result of the worst attempt at a double flare I have ever seen. No wonder it leaked. Jack

.

Tango · 10-14-2018, 09:22 PM

Howdy Cadillac --- I designed the doghouse so that it lifts up and off the seal with about 1/4" to spare. It is definitely a snug fit but is actually pretty easy to deal with. I also had to take the stainless shifter mount I made into consideration (I just wanted more angle out from the dash). Believe me...I have had more than a few sleepless night as I began to fit all the pieces together. At one point I had to back up and punt because I made the first cable too long. The second one is a perfect fit but was still tricky to route around everything else.

And no idea why Allison couldn't come up with something a bit more compact/elegant. As simple as it is, the innards on that thing took me a while to figure out and modify for my use. But hey, (as you well know) building custom stuff is always...interesting.

cadillackid · 10-14-2018, 09:40 PM

Quote:

Originally Posted by Tango

Howdy Cadillac --- I designed the doghouse so that it lifts up and off the seal with about 1/4" to spare. It is definitely a snug fit but is actually pretty easy to deal with. I also had to take the stainless shifter mount I made into consideration (I just wanted more angle out from the dash). Believe me...I have had more than a few sleepless night as I began to fit all the pieces together. At one point I had to back up and punt because I made the first cable too long. The second one is a perfect fit but was still tricky to route around everything else.

And no idea why Allison couldn't come up with something a bit more compact/elegant. As simple as it is, the innards on that thing took me a while to figure out and modify for my use. But hey, (as you well know) building custom stuff is always...interesting.

thise shifters from what i can see are all the same exceot for allison's part number and the bezel.. by flipping over, rotating, bolt positioning etc you can make a lot of different configuratios for the cable angle, I bought a new one with a 'P' on it after my allison swap, was nummed I ordered the wrong one.. then found I could reconfigure it to be the right one.

as for your doghouse hopefully you arent having to open it much.. just to change the filter occasionally.
-Christopher

Tango · 10-14-2018, 09:50 PM

Ya...the shifters are at least easy to configure (once you figure them out). Mine is nothing like the way it came in the mail!

Tango · 10-14-2018, 09:54 PM

Dang Jack! You might hire yourself out as a "sniffer"! Kinda "alarming" the tech gizmo couldn't find anything. Sorry you had to dig so deep to find but really glad you did.

I just hate it when RV's explode.

GuidoLyons · 10-15-2018, 12:23 AM

That is some serious progress Tango. Those stainless map pockets and cubby look really sharp. I'll be out of town for a few days, but when I get back, if you need an extra set of hands to get in the way, err I mean help, let me know.

Tango · 10-15-2018, 12:27 AM

Howdy Guido! Not sure on what, but I will be working daily on something or the other. And you are always welcome to drop by. Just give me a ring to make sure I'm not off chasing some gizmo or such. And remember...the taco house is only open until 3PM! After that, it's REHAB.

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