Does anyone make a composite rear window for a 911?
 

I'm looking for a light weight rear glass option, it seems there should be a gorilla glass or lexan type composite option for these cars. Besides lighter weight I am also looking at getting rid of the defroster grid lines in this process. It seems with all the resto-mod options out there this should exist however I cannot find any.

Fiberglass and carbon fiber body panels but I cant find a composite glass....

Thanks!

One Option:

http://www.fivestarbodies.com/store/index.php?p=catalog&parent=87&pg=1

Option #2:

https://www.plastics4performance.com/window-kits-windscreens/porsche-911-pro-lexan-rear-screen.html

Make one. Find a local plastics supplier and either buy the sheet, or get them to cut it for you.

WOW! Thanks AG81. Both of those look like great options. Have you had any experience with either?

is there a targa option?

No experience first hand...... http://forums.pelicanparts.com/suppo...s/beerchug.gif

I've used 5 Star and Shields for 911 and 914 racecar front windshields in the past. Both were good, no issues. For the rear windows I just get a flat sheet from the local plastics store and cut it with a jigsaw because it's much cheaper.

Five Star make great products... a Wisconsin company. I have used 2-3 of their windshields.

I make my own plastic rear windows. I use PETG instead of polycarbonate.

Racing Shields also make plastic rear windows (SHIELDS Premier Windshields - Racing Rear Window Pricing and Models).

I recently bought a 3/16 Racing Shields rear window via the PP forums. I do not need it, so I will advertise it in the forums.

It is a Racing Shields 3/16 inch thick 911 rear window.

For the sake of clarity:

Polycarbonate is often used. The GE version is called Lexan. Crack-resistant, but prone to scratching. This material is often used for front windshields in racing applications.

Plexiglass should NEVER be used. The generic name for plexiglass is acrylic. While scratch resistant, it is prone to cracking and is therefore NOT suitable for windshield applications. Some racing organizations may not allow it for rear windows either.

PETG is what I use for rear windows. It has optical clarity and scratch resistance like acrylic/plexiglass, but is more crack-resistant like polycarbonate.

gt-racing has windows and frames.

Thanks everyone. I am going for the factory look as well so I do not want visible rivets or bolts around the boarder of the window. It looks like one of these guys can do that.

What is the proper thickness of Lexan/PETG to use? Can the rubber-surround seal be re-used?

Aircraft Windshield Co. in Anaheim, CA are 3rd generation family run and make terrific products. I have used them many times on my non-Porsche race cars and highly recommend them. They also make the "glass" for many of the factory prototypes you see at auto-shows as well as windscreens for a variety of racing series.

Aircraft Windshield Company - Home

Do you always have to use metal straps when using composite style windows in the rear to keep them from blowing out. I’d like to use them but do not want to screw them in or use the metal straps.

Lindsay Racing have them on their site. Don't know if they still make them. I just emailed them about it.

I made my own polycarbonat rear window. Very cheap and very light, but needs to be bolted to the frame:

http://forums.pelicanparts.com/uploa...1550130083.JPG

For racing applications, it is always a good idea to see if there are rules for windshield minimum thicknesses. Of course, even in the absence of specific rules, folks should be prudent. I think most manufacturers use 3/16" thicknesses as a minimum for windshields.

I have been using 3/16 inch thick windshields for my '75 911-based race car for just under 20 years. At this thickness, the windshield can bow inward, so I have a simple brace that is attached on the backside of the mirror to support it. I have quite a few friends with similar set ups, and others use 1/4 thick windshields.

In my case, the windshield is mounted with a later 911-style rubber windshield gasket. It sits pretty flush and works very well. I use two lower alu support straps as an extra measure of security in case of a spin that puts excess pressure to blow the windshield out.

For the rear, I have a custom set-up very similar to what you could buy from companies like Automotion back in the day. An ABS frame and a flush-sitting piece of 1/8 inch thick PETG.

When I bought the car, it had a 1/8 thick piece of polycarbonate as a rear window, again mounted in a rubber seal.