Butyl cord, 1/4" or 9.5mm Options

[HansJan]

Hello Y'all,


Already purchased the Butyl tape, from 914 rubber.
Now I am reading in "Tech Tips 700" (tip 468) to use 1/4" (approx. 6mm) only.
Reason being is that a thicker kit will make the windshield sit too high and the chrome impossible to fit.

Does any one here have this experience with the 9.5mm butyl-cord sold by 914Rubber?
Would hate to go through all this hassle to find a problem like this.

In case it makes a difference, I have ordered the Sekurit branded Windshield from Prosource.

Thanks in advance (because I know one of you will advise).

[DRPHIL914]

whatever cord I got from 914rubber was perfect for the front but for rear it was too thick and I will end up pulling that window and re doing it with smaller 1/4" cord this winter sometime. but on front my brand new window from Porsche sits perfectly flat and trim is flush.

[HansJan]

whatever cord I got from 914rubber was perfect for the front but for rear it was too thick and I will end up pulling that window and re doing it with smaller 1/4" cord this winter sometime. but on front my brand new window from Porsche sits perfectly flat and trim is flush.

Do we know if there is a difference in glass thickness between the Porsche and Sekurit windshields?

[raynekat]

whatever cord I got from 914rubber was perfect for the front but for rear it was too thick and I will end up pulling that window and re doing it with smaller 1/4" cord this winter sometime. but on front my brand new window from Porsche sits perfectly flat and trim is flush.

Do we know if there is a difference in glass thickness between the Porsche and Sekurit windshields?

My Sekurit (from Finland) is right at 6mm or 0.236" (a shade under a 1/4 in).
There's one data point for you.

It's very important when you're installing the windshield to understand how the windshield thickness and butyl final thickness together will end up.
As the two of those combined will let you know if you can get the trim snapped into place....or not as in my 1st attempt.
I've found that you're going to get a little compression of the butyl but not all that much.
When the weather gets cooler, the butyl is even harder to compress very much.

This is why picking the correct size butyl (6.5 vs 8 vs 9mm) is so critical.
And different cars with different shaped/thickness windshields will all need their correct size.

Right now my install is on hold waiting for some Porsche factory trim clips to show up.
The aftermarket ones I had previously used were of inferior quality and quite a few of them broke when trying to snap the trim in.
See thread on that problem if you're interested.
http://www.914world.com/bbs2/index.php?showtopic=334211