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> Dual rear window glass, practical??
Chris914n6
post Mar 21 2004, 03:56 PM
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Since the NSX had a 2 pane rear window I was wondering if it would be worth it for the 914? I know the NSX has a vacuum in between to cut sound transmission that would be hard to create.
The 914 has the room on the "ledge" for 2 and a gap (5mm + 5mm + 5mm).

fire away (IMG:style_emoticons/default/fighting19.gif) (IMG:style_emoticons/default/chatsmiley.gif) (IMG:style_emoticons/default/smile.gif)
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McMark
post Mar 21 2004, 04:14 PM
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I thought about this and never followed up. It would be great for sound deadening. I had some seat time in Jenny's car (which doesn't have a rear window) and it was LOUD. I'm game ($) if we can figure something out.
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TheCabinetmaker
post Mar 21 2004, 04:19 PM
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Any glass shop can get a insulated glass unit made in the thickness you request and in the shape you want if given a pattern to go by. Not sure if it would make any diff in the teen or not. The factory glass is about 5mm or 3/16". probably wouldn't give but 3 or 4mm of vacuum in between.
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TheCabinetmaker
post Mar 21 2004, 04:21 PM
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BTW, better have it tempered. You can also have it made from tinted glass. Should be easy.
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bernbomb914
post Mar 21 2004, 04:56 PM
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It should help with the heat transfer also and make the car cooler.

count me in if it is cost effective.

Bernie
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TheCabinetmaker
post Mar 21 2004, 05:06 PM
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I pay less than $100 bucks for a 4' X 4' insulated glass panel. Two peices of 1/4" plate with 1/2" space in between. Tempered is slightly higher. I have to order some tomorrow. I'll check with my supplier and see if it can be done and the cost.


Curt
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Qarl
post Mar 21 2004, 05:27 PM
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Isn't there a slight bend to the shape of the glass?

I don't have one in front of me, but I would think that an insulated glass panel wouldn't flex.
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Chris914n6
post Mar 21 2004, 05:38 PM
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Silly question.... what's special about insulated glass?

Thanks Curt, let us know.

Starting to look like I'm going to have 2 extra windows instread of 0. (IMG:style_emoticons/default/sad.gif)

The rear glass is flat.
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TheCabinetmaker
post Mar 21 2004, 05:38 PM
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I wondered about that too Karl, but not according to my cabinetmakers straight edges. Apperars to be a flat peice of glass. I have a car without a rear glass, and lots of 1/4" plate we took off a job last week, so I should be able to make a pattern, cut a piece and find out. I can do that tomorrow.

you guys got me thinking now. I'll report back later.

It will also add some weight to the car.
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TheCabinetmaker
post Mar 21 2004, 05:48 PM
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Insulated glass is two plates of glass with a dead air space in between, ie, vaccum. The ouside glass will be hot or cold to the touch. The inside will be room temp. It would also keep the rear window from fogging.

Goddamn, I got to do one now!

Hmmm, one more thought. Chris, do you have one that's out? check the edge and see if it's laminated glass. Two sheets of glass with a thin sheet of plastic in the middle.
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F4i
post Mar 21 2004, 06:16 PM
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I have one on my kitchen table right now, it is flat and not laminated.
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F4i
post Mar 21 2004, 06:17 PM
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BTW good idea.
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TheCabinetmaker
post Mar 21 2004, 06:19 PM
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Thanks Dylan
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JeffBowlsby
post Mar 21 2004, 06:24 PM
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QUOTE
It would also keep the rear window from fogging.


Until the edge seal fqails then it will fog when water gets in. Insulated galss is not a good application for cars, and it would be difficult to accommodate the thickness of that glass assembly in teh rabbet of the 914 rear window.

A much better idea is laminated glass...it has a higher sound isolation rating than insulated glass and could be made as a direct replacement for the thickness of the stock glass. Its the same stuff used as windshields.
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TheCabinetmaker
post Mar 21 2004, 06:26 PM
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Well, there is one more small problem. I don't think there's enough room between the glass and the backpad, or side trim peices to go any thicker.
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GWN7
post Mar 21 2004, 06:31 PM
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If it can be done, it should be tempered so if it breaks there isn't many sharp edges at neck height.

As to the insulated glass, many window builders use argon gas with a reflective heat shield on one of the layers of glass. The two panes (or three)of glass are sealed around the edges with silicone and a needle is inserted between the panes. The air is sucked out and a squirt of argon is put in to displace any moisture. This stops the glass from getting cloudy when it heats up.
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Mark Henry
post Mar 21 2004, 06:43 PM
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QUOTE(bowlsby @ Mar 21 2004, 04:24 PM)
QUOTE
It would also keep the rear window from fogging.


Until the edge seal fqails then it will fog when water gets in. Insulated galss is not a good application for cars, and it would be difficult to accommodate the thickness of that glass assembly in teh rabbet of the 914 rear window.

(IMG:style_emoticons/default/agree.gif)

If it's not sealed it will fog.

Not practical IMO
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TheCabinetmaker
post Mar 21 2004, 07:00 PM
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Sealing is not the problem. The compund to seal the two sheets of glass is the same compound used to seal the glass to the frame. One shouldn't fail before the other. As long as the unit is professionally made. The thickness, I think, is a problem.
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Chris914n6
post Mar 21 2004, 10:40 PM
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QUOTE(vsg914 @ Mar 21 2004, 04:26 PM)
Well, there is one more small problem. I don't think there's enough room between the glass and the backpad, or side trim peices to go any thicker.

I'd look if I had mine in... maybe that's why it fell out in the first place. (IMG:style_emoticons/default/laugh.gif)

My car is unique in that the V-6 puts alot of heat into the firewall, softened up the roll seal.

My pads can be trimmed since they are getting a cloth covering anyways. Rear pad is now carpet.

I'm still looking for a rubber seal to hold the 2 pieces of glass together. Argon injection may be an issue. Oh, I'm still looking into using factory glass if you haven't guessed yet. (IMG:style_emoticons/default/smile.gif)
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bernbomb914
post Mar 21 2004, 11:09 PM
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You could use plexiglass instead of Glass. It is much thinner and wont shatter like glass. I think it is also stronger.

Bernie
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