|
|
|
|
| Author |
|
|
Registered User
Join Date: Oct 2012
Posts: 31
|
Need info: Lexan Rear Window WITHOUT SCREWS
Hey pelicans,
I've seen a few pictures from race/street builds of cars (including Jack Olson's BB2) that have a lexan rear window without screws! Most have used a getty flush mount frame or equivalent, but I haven't been able to find any info on how the window was physically fastened to the frame if external screws weren't used. It seems that urethane alone wouldn't be enough to stop the negative pressure from pulling the window out... But obviously something is working to hold it in there. If anyone has any info or experience on this, I'd greatly appreciate the feedback. Cheers, Justin |
||
10-23-2014, 02:20 PM
|
|
|
Grappler
|
They all have screws. BB11 had the screws covered, but with a lexan window you need to have it screwed in or it will pop out.
__________________
Grappler Know Gi / No Gi 1976 RSR Backdate (Turbo 3.2) |
||
|
10-23-2014, 04:53 PM
|
|
|
Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
|
Yep Rod is correct. Jack "cheated" on his car and covered the fastening with chrome tape to make it look like bright aluminum trim. Read both links below- they're not the same thread
Getty Flush Mount Frame Kit The Getty Design Flush Mount Frame Kit If you can effectively clamp the lexan to the Getty frame, the urethane will hold the lexan in place. The urethane is basically windshield glue. I have used the 3M Windo Weld product in a caulk gun tube and it works very well. It basically turns to pure rubber when cured and is a VERY good adhesive. I really doubt the lexan would come unglued from the air pressure it sees. I think the greater challenge would be how do you make the adhesive look clean? A lot of guys paint a black or body color band around the lexan to give it a clean finished look. With the urethane it'd be hard to make the mating area between the lexan and the frame look clean?
__________________
Kevin L '86 Carrera "Larry" |
||
|
10-24-2014, 07:06 AM
|
|
|
Registered
Join Date: Jun 2013
Posts: 1,299
|
what about fitting a front windshield?? Does the gasket suffice?
__________________
www.machine-motorsports.com 1971 911T 3.2 1971 911S 2.5 1972 911S 2.8 1972 911T 2.7 1965 911 300760 1976 911S |
||
|
10-24-2014, 08:26 AM
|
|
|
Registered
Join Date: Nov 2009
Location: London, Ontario
Posts: 278
|
Quote:
I wouldn't trust it to stay in with just the seal and trim. The lexan is just too flexible. |
||
|
10-24-2014, 10:42 AM
|
|
|
Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
|
In an impact even the well-fitted glass jumps out of the windshield frame. Sure it's heavier so you'd tend to think it would have more inertia to leave the car. But the glass also fits better so it should stay in place better than the lexan. So, windshield retainer clips are recommended regardless of which window material you use. Also do no let the clips lean on the glass if they are not padded. Over time they can cut into the glass and your windshield will crack.
__________________
Kevin L '86 Carrera "Larry" |
||
|
10-24-2014, 01:42 PM
|
|
|
|
Registered
Join Date: Jun 2013
Posts: 1,299
|
I have Lexan just installed on my RSR used the rubber seal. Seems to be a bit play at the bottom of the windshield. This weekend I intend to install retainer clips from TRE. This is my first experience with lexan 1/4 thick
__________________
www.machine-motorsports.com 1971 911T 3.2 1971 911S 2.5 1972 911S 2.8 1972 911T 2.7 1965 911 300760 1976 911S |
||
|
10-24-2014, 02:08 PM
|
|
|
Registered User
Join Date: Oct 2012
Posts: 31
|
Thanks for the info guys... Will update with the final solution.
|
||
|
10-25-2014, 05:52 AM
|
|
|
Grappler
|
I had lexan all around at one point. Its just not worth the hassle. I ended up putting the factory glass back in. For the windshield I used a new replacement China version which is about half the weight as the German original. Most auto glass companies will carry both versions.
__________________
Grappler Know Gi / No Gi 1976 RSR Backdate (Turbo 3.2) |
||
|
10-25-2014, 08:39 AM
|
|
|
Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
|
Quote:
 But my application is a racecar so fit & finish of the end result is a whole different ballgame
__________________
Kevin L '86 Carrera "Larry" |
||
|
10-25-2014, 09:23 AM
|
|
|
Grappler
|
Quote:
lol, thats funny. I should clarify that mine is a street car as well so for street application it wasn't worth it. Track car is different. 
__________________
Grappler Know Gi / No Gi 1976 RSR Backdate (Turbo 3.2) |
||
|
10-25-2014, 09:31 AM
|
|
|
Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
|
I have had a lexan rear screen in my rally car for years. It was cut to the same dimensions as the glass original and is located by the original seal. No problems in nearly a decade - including many tarmac rallies (with jumps) and countless track days.
__________________
Cheers, Ryan 1969 911E (historic racer) 911ST replica (tarmac rally) |
||
|
10-25-2014, 02:02 PM
|
|
|
Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
|
I never had screws in mine, Regular gaskt with a brass round rod inserted in the once used chrome strip.
It did not come out at a indicated 150 MPH
__________________
D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
||
|
10-25-2014, 02:21 PM
|
|
|
Registered
Join Date: Aug 2003
Posts: 1,401
|
Have a lexan rear window in my race car, straps on outside, it sucked in at Fontana, it's now bolted to the straps. My buddy spun at Buttonwillow with a lexan windshield and no clips and blew it out of the car. Scraped to crap, but made it through the weekend. I like my glass windshield
__________________
Patrick |
||
|
10-25-2014, 05:12 PM
|
|
RSR Backdate
