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#915081 - 01/25/12 10:51 PM Re: Grand Prix Bracing [Re: SickSpeedMonte]  
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Furgie Offline
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Furgie  Offline
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Rustbeltville,MA
Originally Posted By: SickSpeedMonte
I would think that if the front clip moved enough that the hood could contribute anything, I would be seeing cracks in the fiberglass around my hood pins. I didn't oversize the holes very much at all.


fiberglass gives,, even the street hoods


Oh when your body starts to shake,It's time to loosen off the brake ,and slam the hammer down
#915129 - 01/26/12 04:44 AM Re: Grand Prix Bracing [Re: Furgie]  
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MAP Offline
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MAP  Offline
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Yuma, AZ
Hi Furgie,

Are you saying that you tried this and the hood buckled or warped on that 1980 F-body? It's hard to believe the stresses could be so high on a G-body, but if so, and the usual suspects for underhood braces don't buckle, or at least don't cause the things they're attached to to deform, then this would only show how flimsy the whole arrangement is.

With a hood, I would imagine you coud adjust stiffness over a more or less continuous range by tweaking a snubber here or a clearance there, so that a happy medium between stiffening and lack of warping could be achieved.

Best,
MAP

Last edited by MAP; 01/26/12 04:45 AM.
#915152 - 01/26/12 01:22 PM Re: Grand Prix Bracing [Re: MAP]  
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Furgie Offline
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Furgie  Offline
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Rustbeltville,MA
yes we try'd this and after 4 hoods..we finally had it down..
stick welded, plug welded and boxed the inner skins c channels.
then bolted it on.. 4 bolts down each side and four acroos the back(cowl) and the front(core support) those year t/a hoods are almost flat,, like the monty's
unlike the 80 camarowith bends that add strenth.. all to keep the sub frame from moving around.. frontroll cage mounts in the engine compartment was out.. as we liked having heat and a/c
we also did the same to the fenders.. and core supportthey where all stich welded.. basicly the nose was a steel one piece with a bolt on hood..


Oh when your body starts to shake,It's time to loosen off the brake ,and slam the hammer down
#915153 - 01/26/12 01:26 PM Re: Grand Prix Bracing [Re: MAP]  
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Furgie Offline
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Furgie  Offline
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Rustbeltville,MA
Originally Posted By: MAP
Hi Furgie,

Are you saying that you tried this and the hood buckled or warped on that 1980 F-body? It's hard to believe the stresses could be so high on a G-body, but if so, and the usual suspects for underhood braces don't buckle, or at least don't cause the things they're attached to to deform, then this would only show how flimsy the whole arrangement is.

With a hood, I would imagine you coud adjust stiffness over a more or less continuous range by tweaking a snubber here or a clearance there, so that a happy medium between stiffening and lack of warping could be achieved.

Best,
MAP
you can dent the g body hood close'n it. with the palm of your hand, if you are not carefull.. sticking hinges have also been the cause of the death of these hoods..


Oh when your body starts to shake,It's time to loosen off the brake ,and slam the hammer down
#915154 - 01/26/12 01:53 PM Re: Grand Prix Bracing [Re: Furgie]  
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Rising_Zann Offline
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Severn, Md
Would the cowl hood be any better?

#915182 - 01/26/12 06:35 PM Re: Grand Prix Bracing [Re: Rising_Zann]  
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MAP Offline
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MAP  Offline
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Yuma, AZ
Hi Furgie,

I hear what you're saying, but something still doesn't add up for me. I know it's easy to bend the G-body hood while closing it, but the kind of stiffness in the hood needed to stiffen the front end of the car doesn't really relate to the hood's ability to resist bending while closing.

Again, if so much strength is needed in the hood to resist failure, then why do the flimsy underhood braces added to the G-body not suffer a similar fate? (I believe I may have answered that question a while back.)

Best,
MAP

#915785 - 01/30/12 10:19 AM Re: Grand Prix Bracing [Re: MAP]  
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MADMIKE Offline
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C.V. CA
Just to add a data point.
On the '87 Cutlass it originally only had the two lower \ / frame horn braces along with the wire fender braces. With the soft stock front springs, the front end would shake going over irregularities in the road, similar to cowl shake. Installation of the GP brace and 78-80 Cutlass fender braces greatly reduced the cowl shake, but the steering needed attention as there was now slop in the wheel. Even after switching the springs to 600lb/in front springs the front clip did not exhibit any excess movement. The only thing that I notice now is while at speed the aluminum hood flutters. It always did flutter, same as my '79, but now being the only thing that discernibly moves around at speed.


-Michael
Where the hell is JMD?!
#915805 - 01/30/12 03:30 PM Re: Grand Prix Bracing [Re: MADMIKE]  
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axisg Offline
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Toronto, Ontario
On every Gbody I have owned the body mounts on the front frame horn thru the rad support have always been soft. I would notice when leaning over the fender / header panel and into the engine bay that the whole front end would shift. I was advised many years ago that swapping out those front body mounts for hockey pucks would firm up the front end for cheap ( and it works ). On my car with the pucks in place ( $2.00/side ) and with the gp bars installed the front end no longer shifts.


TES Headers - done !
new cat-back exhaust - done !
5.7 swap - done !
3.73 posi rear - done !
blazer front brakes - done !
LS1 Rear Brakes - done!
transmission - rebuilt !
now looking for a replacement rear
__________________________________


#915864 - 01/30/12 10:43 PM Re: Grand Prix Bracing [Re: axisg]  
Joined: Aug 2009
Posts: 231
Monte88 LS Offline
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Monte88 LS  Offline
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Cedar Falls, IA
Hockey pucks huh?? My son would have a kniption fit if I used a couple of those on the Monte. (Yeah, he's a hockey nut) Interesting solution tho. Might have a grab a couple while he's not looking. wink


Mark

88 LS/CL, bone stock
#915867 - 01/30/12 10:57 PM Re: Grand Prix Bracing [Re: MAP]  
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Furgie Offline
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Furgie  Offline
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Rustbeltville,MA
Originally Posted By: MAP
Hi Furgie,

, then why do the flimsy underhood braces added to the G-body not suffer a similar fate? (I believe I may have answered that question a while back.)

Best,
MAP


one word, what is the strongest in any type engineering.. = triangle.. the flimsy braces finish making a________________________..

Last edited by Furgie; 01/30/12 10:57 PM.

Oh when your body starts to shake,It's time to loosen off the brake ,and slam the hammer down
#915895 - 01/31/12 01:37 AM Re: Grand Prix Bracing [Re: Furgie]  
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MAP Offline
15+ Year
MAP  Offline
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Yuma, AZ
Yes - but a shear panel could be viewed as a plane with an infinite number of triangles.

Best,
MAP

#915898 - 01/31/12 01:47 AM Re: Grand Prix Bracing [Re: axisg]  
Joined: Jan 2003
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Aeroaddict Offline
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Aeroaddict  Offline
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Fairfield County ,CT
Originally Posted By: axisg
swapping out those front body mounts for hockey pucks would firm up the front end for cheap.


Spoken like a true Canadian..(Sorry George, had too) grin


87 Monte SS Aerocoupe- Street / Strip

www.ctgbody.com

CT G-body Facebook
#915922 - 01/31/12 03:47 AM Re: Grand Prix Bracing [Re: Aeroaddict]  
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MADMIKE Offline
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MADMIKE  Offline
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C.V. CA
One other thing I forgot to mention. On my '79 Cutlass with the straight fender bars, there was not the rad support 'X' bracing, but my '87 did have the bracing. IIRC all the Buick A/Gs had those cross braces.


-Michael
Where the hell is JMD?!
#915991 - 01/31/12 04:31 PM Re: Grand Prix Bracing [Re: Aeroaddict]  
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axisg Offline
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Toronto, Ontario
Originally Posted By: Aeroaddict
Originally Posted By: axisg
swapping out those front body mounts for hockey pucks would firm up the front end for cheap.


Spoken like a true Canadian..(Sorry George, had too) grin


And proud of it ! smile The pucks are cheap and you don't have to buy a whole bushing set just for the 2 you need.

Last edited by axisg; 01/31/12 04:35 PM.

TES Headers - done !
new cat-back exhaust - done !
5.7 swap - done !
3.73 posi rear - done !
blazer front brakes - done !
LS1 Rear Brakes - done!
transmission - rebuilt !
now looking for a replacement rear
__________________________________


#925170 - 03/27/12 03:59 PM Re: Grand Prix Bracing [Re: axisg]  
Joined: Oct 2005
Posts: 1,294
2manymontees Offline
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2manymontees  Offline
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Whitmore Lake, MI
What are the hockey pucks you used made out of? I have heard people using them before. I've also heard of PVC.. many others as well.


1980 Monte, Vapor Grey/Claret, 229 V6 (LC3)/TH-350/2.41, 101k. (in resto.)
1983 Monte SS, White, 305 (L69)/TH-350C/3.42, 39k.<<2012/13 NMCOA Class Winner
1984 Monte SS, Med. Blue Met., 350 V8 (ZZ4)/TH-700R4/3.73 POSI, 76k. (Father/Son Car)
1987 Monte LS, Lt. Blue/Dk. Blue, CL interior, 305 (LG4), TH-2004r, 2.41, 176k (weekend driver)
#925181 - 03/27/12 05:42 PM Re: Grand Prix Bracing [Re: 2manymontees]  
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Posts: 3,015
kubihibi Offline
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kubihibi  Offline
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Kingsland, GA
vulcanized rubber



Oh SNAP! I'm a Vet! Stuff for Sale
#925371 - 03/28/12 08:46 PM Re: Grand Prix Bracing [Re: kubihibi]  
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Posts: 1,294
2manymontees Offline
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2manymontees  Offline
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Whitmore Lake, MI
Hmm I'm wondering how vulcanized rubber ranks between the factory material, Delrin and PU.


1980 Monte, Vapor Grey/Claret, 229 V6 (LC3)/TH-350/2.41, 101k. (in resto.)
1983 Monte SS, White, 305 (L69)/TH-350C/3.42, 39k.<<2012/13 NMCOA Class Winner
1984 Monte SS, Med. Blue Met., 350 V8 (ZZ4)/TH-700R4/3.73 POSI, 76k. (Father/Son Car)
1987 Monte LS, Lt. Blue/Dk. Blue, CL interior, 305 (LG4), TH-2004r, 2.41, 176k (weekend driver)
#925652 - 03/30/12 08:18 PM Re: Grand Prix Bracing [Re: Furgie]  
Joined: Oct 2008
Posts: 184
tall t-top Offline
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Posts: 184
San Antonio, Texas
what cars had the rear seat bracing. I have been wanting to make some but i need to know where the mount locations are.


Andrew

86 MC SS t-top, 305 with port and polish, Edlebrock Performer Intake, Flowtech Afterburner headers, duals to Jeg's chambered mufflers, Jeep steering shaft, Turbo Eclipse seats (Weekend toy but a project at the moment)
91 C1500 extended cab, TBI 350, 2in suspension lift, Jeep steering shaft. (Daily driver)
2012 Mitsu Outlander Sport (wife's car)
#927173 - 04/09/12 04:50 PM Re: Grand Prix Bracing [Re: 2manymontees]  
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Posts: 3,015
kubihibi Offline
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kubihibi  Offline
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Kingsland, GA
Originally Posted By: 2manymontees
Hmm I'm wondering how vulcanized rubber ranks between the factory material, Delrin and PU.


I know if you go rock crawling on heavy trails, you risk shredding the puck. Literally ripping in apart. I haven't witnessed any poly bushings ripping, but that doesn't mean it doesn't happen.



Oh SNAP! I'm a Vet! Stuff for Sale
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