Frame stiffening kits? - Chevelle Tech
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post #1 of 85 (permalink) Old May 13th, 11, 3:58 PM Thread Starter
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Matt
 
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Frame stiffening kits?

Does anyone make/sell kits to stiffen a '71 chassis?
I'm looking to box my frame and add some braces.
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post #2 of 85 (permalink) Old May 13th, 11, 4:47 PM
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Erik
 
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Re: Frame stiffening kits?

I haven't, but it wouldn't be too hard to make up some cardboard templates and take them to a metal shop and have them stamp them out. Then some minor trimming and welding. I would recommend some "speed holes" to save some weight and also so you still have access to run wiring or plumbing through the frame rail easily, not to mention still being able to protect the inside from rust
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post #3 of 85 (permalink) Old May 13th, 11, 5:25 PM Thread Starter
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Matt
 
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Re: Frame stiffening kits?

I suppose the boxing itself is easy enough, good tip on the lightening holes.
What I'm really trying to find is pre-bent tube to create bracing as shown below.

Maybe not that extreme but you get the idea.
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post #4 of 85 (permalink) Old May 13th, 11, 6:48 PM
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Re: Frame stiffening kits?

hpi motor sports in canada makes a complete kit for frame a-body cars. go to pro-touring.com and find it. you are looking at a complete roadster shop chassis in that last picture.you are not going to duplicate that. greg
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post #5 of 85 (permalink) Old May 14th, 11, 3:00 AM
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Re: Frame stiffening kits?

Quote:
Originally Posted by greg5436 View Post
hpi motor sports in canada makes a complete kit for frame a-body cars. go to pro-touring.com and find it. you are looking at a complete roadster shop chassis in that last picture.you are not going to duplicate that. greg
Who says you cant duplicate the bracing of the RS chassis? Maybe not in a ready to go kit which you may be talking about but if not remember, they bent tubing too.

Hot rods to hell sells a boxing plate kit. Thing is, if you are equipped to install a boxing kit then you should be able to make it your self. It really is as easy as cutting some plate and welding it in.

As far as braces are concerned, Art Morrison sells a bent tube kit to fit in but it requires a crossmember as the lower control arm area of the frame to weld into.

OP, If you want an RS chassis without the cost, get ready to fab your own stuff. There arent kits or anything else that are gonna get a full ready built chassis but a little fab and elbow grease and you can do pretty good.

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post #6 of 85 (permalink) Old May 14th, 11, 3:41 AM
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Derrick
 
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Re: Frame stiffening kits?

get some solid body mounts. that will stiffen things up quite a bit. you can then soften up the springs a touch if you think the ride is too rough for some reason.
follow what GM did starting in the 70's and going on up thru the G bodies- make some braces that go from the middle of the engine crossmember forward and out towards the front of the frame horns, then add a cross bar that connects the forward mounting points of those bars together and ties the whole front of the frame together with a big triangle.
my 74 Monte had some braces that went from the back of the engine crossmember by the motor mounts back to the frame rail by the firewall.

up in the engine bay, add some braces that cut across the front corners of the engine bay between the radiator support and fender- go about a foot out from the corner each way for the mounting points- and from the mounting points of those bars on the fenders, over the engine, and to a common point at the center of the firewall right above the distributor.. again, you are building a big triangle tying everything together.

another popular place to brace on the 78 and up G bodies is behind the rear seat- a couple of cross braces back there will tie the body together and actually prevents the factory body filler where the quarter panel and roof meet from cracking under high loads. i don't know what's behind the seats on an older A body, but the G bodies are pretty much wide open back there.

all these braces can be made out of thin wall steel tubing for not a lot of money or a lot of fabrication time- you are just making a bunch of triangles to tie different parts of the body and frame together. i can say from my own personal experience that just adding the braces from the engine crossmember to the front of the frame horns to my 84 Regal made the car feel a lot more solid and even got rid of an annoying creak in the dash that i could never track down.

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post #7 of 85 (permalink) Old May 14th, 11, 4:53 AM
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Re: Frame stiffening kits?

Quote:
Originally Posted by 71Avido View Post
Does anyone make/sell kits to stiffen a '71 chassis?
I'm looking to box my frame and add some braces.
As Greg mentioned HPI Customs offers a great kit.
http://www.hpicustoms.com/






Mike
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post #8 of 85 (permalink) Old May 14th, 11, 11:36 AM
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Re: Frame stiffening kits?

I was just going to add in that I spoke to HPI about their kit this week. They seem like a good group of people.

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post #9 of 85 (permalink) Old May 14th, 11, 4:22 PM Thread Starter
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Matt
 
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Re: Frame stiffening kits?

Quote:
Originally Posted by F1 Speed View Post
As Greg mentioned HPI Customs offers a great kit.
http://www.hpicustoms.com/
Thats the exact sort of thing I'm looking for!
Given, the crossmembers are way more trick that I need but something like that would be perfect!
I will wind up doing my own home-job on the boxing but since I don't plan on investing in a bender just yet HPI may be the ticket.

I also plan on installing some bracing around crossmembers/control arm brackets to stiffen things up a buit and hopefully keep them on the frame.
For those I am just planning on using 3/16" plate as some quick gussets.

Will the 3/16" be overkill for this job?
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post #10 of 85 (permalink) Old May 14th, 11, 6:47 PM
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Re: Frame stiffening kits?

Quote:
Originally Posted by 71Avido View Post
Thats the exact sort of thing I'm looking for!
Given, the crossmembers are way more trick that I need but something like that would be perfect!
I will wind up doing my own home-job on the boxing but since I don't plan on investing in a bender just yet HPI may be the ticket.

I also plan on installing some bracing around crossmembers/control arm brackets to stiffen things up a buit and hopefully keep them on the frame.
For those I am just planning on using 3/16" plate as some quick gussets.

Will the 3/16" be overkill for this job?
Yup, 3/16" is perfect. Cool thing about the cross members in the HPI kit is that it comes with nice weld on exhaust hangers and the bolt holes are already there in the perfect locations.

Mike
Special Thanks to:
Lewis Racing Engines BB 408
(538.8 HP. @ 6200 & 506.4 Ft. Lbs. TQ. @ 5100)
http://www.youtube.com/watch?v=y92Jkg3Tok0

Black on Black 69 SS Chevelle
2011-2012 Updates:
Straub Tech. & LRE Custom Hyd. Roller
Trend Pushrods (Lewis Racing Engines)
Holley HP MP/EFI System
Jake's Perf. 200-4R w/ Fixed Line Pres.
MW 3.5" Alum Drive Shaft
AAW Classic Update Harness
Custom 3" Oval Tube Exh w/ X-Pipe & XR-1's
New BB Parts For Sale: http://www.chevelles.com/classifieds...?product=48616
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post #11 of 85 (permalink) Old May 14th, 11, 10:59 PM
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Re: Frame stiffening kits?

Yall suck...Mike you make me spend to much money by giving me all kinds of ideas. I just sent them an email. I been welding on my frame since thursday trying to get it ready to get powdercoated. Mike those pictures you posted are identical to my frame just my weld transitions are smoother. Nice job

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post #12 of 85 (permalink) Old May 14th, 11, 11:44 PM
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Re: Frame stiffening kits?

just curious for those who have emailed HPI, how much is the kit?
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post #13 of 85 (permalink) Old May 15th, 11, 7:08 AM
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Re: Frame stiffening kits?

Quote:
Originally Posted by Spankydxm View Post
Yall suck...Mike you make me spend to much money by giving me all kinds of ideas. I just sent them an email. I been welding on my frame since thursday trying to get it ready to get powdercoated. Mike those pictures you posted are identical to my frame just my weld transitions are smoother. Nice job
LOL.... Ya I know what you mean. Hangin out here on TC tends to drive up the budget sometimes, but i love it all the same. Good luck with your project and be sure to post up some pics of your frame when it's ready.

Quote:
Originally Posted by 70'ChevelleSUPERFREAK View Post
just curious for those who have emailed HPI, how much is the kit?
The full kit posted in the pics is $600.00 and I'm told shipping is another $120.00 - $140.00. I fabed my own for my project a few years ago that looks almost identical (with the exception of the cross members) and I can tell you that $600.00 is right in the ball park when you consider material costs & CNC laser cutting time. I wouldn't hesitate to order this kit for my next project if I ever get the one I'm workin on now finished.
Here's what ya get in the HPI Kit and I'm told you can get it in various forms.
Rear Cross Member
Trans Cross Member
Side Mounts (Adjustable Trans Cross Members)
Tubular K Member
Exhaust Hangers
Body Mount Reinforcements

Mike
Special Thanks to:
Lewis Racing Engines BB 408
(538.8 HP. @ 6200 & 506.4 Ft. Lbs. TQ. @ 5100)
http://www.youtube.com/watch?v=y92Jkg3Tok0

Black on Black 69 SS Chevelle
2011-2012 Updates:
Straub Tech. & LRE Custom Hyd. Roller
Trend Pushrods (Lewis Racing Engines)
Holley HP MP/EFI System
Jake's Perf. 200-4R w/ Fixed Line Pres.
MW 3.5" Alum Drive Shaft
AAW Classic Update Harness
Custom 3" Oval Tube Exh w/ X-Pipe & XR-1's
New BB Parts For Sale: http://www.chevelles.com/classifieds...?product=48616
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post #14 of 85 (permalink) Old May 15th, 11, 10:04 PM
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Re: Frame stiffening kits?

This is a good looking kit, a good addition to any A Frame.
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post #15 of 85 (permalink) Old May 15th, 11, 10:08 PM
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Chris #5376
 
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Re: Frame stiffening kits?

Quote:
Originally Posted by 71Avido View Post
Thats the exact sort of thing I'm looking for!
Given, the crossmembers are way more trick that I need but something like that would be perfect!
I will wind up doing my own home-job on the boxing but since I don't plan on investing in a bender just yet HPI may be the ticket.

I also plan on installing some bracing around crossmembers/control arm brackets to stiffen things up a buit and hopefully keep them on the frame.
For those I am just planning on using 3/16" plate as some quick gussets.

Will the 3/16" be overkill for this job?
You would be good buying structural tubing in Steel, or even Chromoly. Take to a exhaust shop and they can bend up for a minor amount of cash..... good luck
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