Hello Does anyone know the Rules For NHRA / IHRA Lexan Thickness for Front, Rear and side windows on a door car?

I just dont want to go ordering the wrong stuff.


Thanks!


Greg

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I believe minimum for side and rear are 1/8" (or 0.120"?). That's what I have on Project V. Windshield may be thicker, but can't remember. I know it is thicker for SCCA and NASA.

Lou

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Home of Slant6-powered fun machines since 1988

Cool - The stuff I have seen so far is 1/8" or 3/16"


So I'll plan on getting 1/8" for sides and rear and possibly 3/16" for front.

Greg

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You are better off with 3/16" at least in the windshield. Side windows 1/8" is normal.

That is what my Pro Glass kit from Glasstek is, and the windshield and back glass are molded.

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Greg
Where are you planning to order from. Looks like prices vary a Lot.
Frank

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73 Duster - Race Car
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178" FED
82 D150
All Slant powered

How much weight difference when replacing all the glass? Later
Ryan

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If you get rid of all mechanisms and go to lexan, I figure sides and rear on a mid 60s car save about 60-80 lbs. Windshield will be around 15-20 lbs. I'd have to look back to get exact numbers... I weigh everything.

We pulled about 15lbs of undercoating out by stripping the whole Project V inside and underside. I have not gotten too serious with this car and even with 110 lbs of rollcage it is 2490 without me, but with 12 gals gas. Still has glass windshield+gasket in it and stock steering column. 50-100 lbs more out of it should be no problem.

Lou

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Home of Slant6-powered fun machines since 1988

1/8th is legal,have been 115mph with 1/8th windshield.Mark

Good Discusion Here guys.


I was looking at summit for just lexan / polycarbonate sheets. the long 72" X24" sheets are about $100 a piece - I also have to stop in the local storm door shop too.

I guess I could get one of the pre molded Windshields for the front Windshield for ruster, but it's like $375 - $400 range..


The side and back should be eailsy cut from sheets.

I am also looking to get rid of most of the metal frame around the doors except for the driver's door and just totally cut and gut as much as i can from the rear doors. - I might even get rid of the rear hinges and just weld the rear doors shut once cut and gutted.



Greg

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The windshield on my 70 Cuda is 21 lbs stock 11 lbs. 1/4 inch pro glass. Not worth it .The sides in 1/8 inch save about 3 pounds per door and 2 in a 64 sedan. However the cranks and other stuff you can cut out will amount to about 50 lbs total on a A body. For the side windows the best deal i have found on !/8 inch is from glass installers remnants. Make a card board template and take it to different shops, MY 64 all four sides were about $20 .