Lexan rear window and frame install questions

[Formerly Steve Wilkinson]

I'm starting installation of a Lexan rear window (also windshield, but that will assumedly be straightforward) and a f/g MA Shaw frame (surround) that eliminates the ventilator step at the back of the roof, to get rid of a configuration that creates draggy detached flow.

It's pretty much a figure-it-out-as-you-go installation--attaching the frame to the window hole--so I'd like to see if anybody has done it and has advice or tips. I want to make the assembly relatively easily removable, so I'm planning to use nutplates for the f/g surround-to-metal juncture. The Lexan will be permanantly fastened to the f/g, which is no big deal.

But getting the nutplates located and fastened is a bit of a *****, so I'm wondering how many I need and where, which would be a function of how much negative pressure there is above this surface at track speeds.

I'm also interested in ideas on how best to weatherproof/waterproof this installation, since this car will also be street-driven.

Any help out there?

[TimT]

Ive installed a few of these.... but in race car only applications, so weatherproofing wasn't really thought about.

After fitting the fiberglass frame, i.e. grinding/filing/trimming until it was a "snug" fit, such that the piece only needed a little persuasion to fit into place. The lexan window is secured to the frame by a number of countersunk stainless bolts about 6" o/c

I secured the fiberglass frame to the existing window opening using 14 #6X(1/2") stainless sheet metal screws.

To weather proof the window you could try one of the more flowable silicones, I believe they come in clear and black, or maybe bed the frame in butyl, and seal the glass to the frame with clear silicone.

Ive seen a number of attempts at weatherproofing these windows using those method, but cant say if they actually work.

Ive also seen the window Dzused to the frame, but that seems like alot of work for naught.

Removing the quarter windows makes all of these exercises a bit easier

[TimT]

Also fit the lexan to the frame first, you probably need to trim the lexan to fit in the recess in in the frame.

A right angle drill is handier than a regular drill for drilling the pilot holes for the #6 screws

[Formerly Steve Wilkinson]

The frame fits perfectly into the window opening, typical of Getty/Shaw parts. Not the slightest bit of grinding/trimming needed. Obviously, the Lexan will have to be fitted to the frame, but that seems pretty straightforward.

I like the idea of the s/s sheetmetal screws. I think maybe I've been overcomplicating the process with the nutplates idea--like using the Dzus fasteners, which I briefly considered.

Tim T, can I buy Redline from you, since the shipping should be straightforward? I'm about 70 miles form Wantagh.

[TimT]

Ive taken a frame from one car, and tried to install in in another.. and it would not fit without some "adjustments" You would think the tubs are all the same dimensionly.

I agree with Getty/Shaw being quality well fitting glass.

Ill take a pic of an install tomorrow when there is ample light for photos.

Regarding the Redline oil.. we now sell to service customers, and walk ins.. but I see no reason why we couldn't ship you oil when you need it. Of course we could deliver to track events that we might happen to be attending together, Zone 1, the Glen Club race, or others.

Ill talk to the "boss" on tuesday and see if we can help you out. You will get a pm from me