strut brace question
Thread Starter
Drifting
Joined: Jul 2015
Posts: 1,765
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From: Catlett VA
strut brace question
tie rod end of strut brace. one amateur weld- others are better
strut brace on 68 convert with 454 and electric fan
I just finished installing a strut brace on my 68 convert with NOM 454. Fan is removed and space allowed using a strut brace I fabricated using the shark type as a model. Right and left hand threaded tie rod at 16 inch was used with the corresponding rod ends. Brackets use the A arm bolts as attachment points.
Question: I pre-loaded the tension to push (extend) the tie rod against the shock towers. Since there is a slight play in the tie rod ends, is this the correct pre-load? Or would pulling (decreasing the length) give the most stability to the brace?
Race Director
Joined: Apr 2009
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From: Charlotte NC
The engine cradle is trying to collapse inwards to each other...so...apply slight tension outwards is how I would do it. I would not force it outwards.
DUB
DUB
Last edited by DUB; Aug 24, 2017 at 07:13 PM.
Race Director
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From: Eustis ( Area 51 Bat Cave ) Fl
I have seen a lot of long posts about this but cutting to it from my understanding you did it correctly, its how i will do mine...
Last edited by The13Bats; Aug 24, 2017 at 07:01 PM.
Thread Starter
Drifting
Joined: Jul 2015
Posts: 1,765
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From: Catlett VA
Thanks, that's what I did. Just enough pressure to take up the 1/32 inch of play in the rod ends. I figured when the car goes over a hard bump, the upper A arm is forced inward against the frame member, so bracing against that force should help. One more piece of high performance equipment on my car that has never gone over 70 mph!
Thread Starter
Drifting
Joined: Jul 2015
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From: Catlett VA
Race Director
Joined: Apr 2009
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From: Charlotte NC
A spreader bar is a definite improvement and worth its weight in gold in my opinion.
Even though you do not take your Corvette over 70 MPH...that spreader bar is doing a lot for you when you are turning the car and going over bumps,etc. It was a great investment. Hopefully you are aware of what problems you stopped by installing that spreader bar. Mainly the cradle collapse which can cause the Corvette to eventually have to go onto a frame machine and get the cradle stretched back out to specifications again.
DUB
Last edited by DUB; Aug 25, 2017 at 06:40 PM.
Race Director
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From: Napa Valley California
I looked into spreader bars and only found them for sale for small block set ups. I was told that they are not necessary for a corvette set up with a big block and that they could not fit.
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
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Melting Slicks
Joined: Jul 2010
Posts: 3,176
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From: perth western australia
I looked into spreader bars and only found them for sale for small block set ups. I was told that they are not necessary for a corvette set up with a big block and that they could not fit.
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
I just bought a weld up style from VB&P for my 77
https://www.vbandp.com/auto-parts/c2...it-detail.html
Last edited by bazza77; Aug 25, 2017 at 08:46 PM. Reason: add link
Thread Starter
Drifting
Joined: Jul 2015
Posts: 1,765
Likes: 254
From: Catlett VA
It is obvious the great minds think a like.
A spreader bar is a definite improvement and worth its weight in gold in my opinion.
Even though you do not take your Corvette over 70 MPH...that spreader bar is doing a lot for you when you are turning the car and going over bumps,etc. It was a great investment. Hopefully you are aware of what problems you stopped by installing that spreader bar. Mainly the cradle collapse which can cause the Corvette to eventually have to go onto a frame machine and get the cradle stretched back out to specifications again.
DUB
A spreader bar is a definite improvement and worth its weight in gold in my opinion.
Even though you do not take your Corvette over 70 MPH...that spreader bar is doing a lot for you when you are turning the car and going over bumps,etc. It was a great investment. Hopefully you are aware of what problems you stopped by installing that spreader bar. Mainly the cradle collapse which can cause the Corvette to eventually have to go onto a frame machine and get the cradle stretched back out to specifications again.
DUB
"Hopefully you are aware of what problems you stopped " I figure I have a fifty-year-old frame with the A arms fastened to a stub on the old frame. Sooner or later something is going to crack or bend. Sort of like I feel getting up in the morning.
Thread Starter
Drifting
Joined: Jul 2015
Posts: 1,765
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From: Catlett VA
it has RH and LH threads
RH Heim rod end from JEGS #555-64106 ($8.99)
LH Heim rod end #555-64116 ($6.99)
Fastening bolts for rod ends are 5/8 x 2 inch grade 8 bolts with Nylock nuts. about $5 from hardware store.
Bracket is cut from 1 1/4 inch angle iron. Main piece is 9 inches long. Make sure it is not too long or it will rub on the A arm bushing. The tabs are also cut from 1 1/4 inch angle iron and are 3 inches long.
I pre-fit everything before drilling holes and tack welded to check fit.
The front tab has one side of the angle iron removed to allow better access to tighten the large Nylock nut. Lots of grinding done to round off sharp corners.
Installation tip: Jack up the car to take the pressure off the A arm before loosening the caster/camber adjusting nuts, otherwise the bolts may pull through the frame mounting point.
Last edited by ronarndt; Aug 26, 2017 at 01:22 PM. Reason: typo
Melting Slicks
Joined: Oct 2001
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Likes: 1,382
From: Halifax, Nova Scotia, Canada
Thread Starter
Drifting
Joined: Jul 2015
Posts: 1,765
Likes: 254
From: Catlett VA
I looked into spreader bars and only found them for sale for small block set ups. I was told that they are not necessary for a corvette set up with a big block and that they could not fit.
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
Call me dumb, but exactly what does the spreader bar do, and if you know, where can I purchase one for my 73 BB???
As bazza77 said, the engine driven fan gets in the way of the bar. My car came with both an engine driven fan and an electric fan for the aftermarket aluminum radiator. Much of the fan shrouding was for a small block and did not fit well, so I removed it and also the engine driven fan. No overheating problems and now lots of room for the strut brace.
On your BB car, you might be able to fit a brace that clears the fan, but I suspect you would need to put a bend in it to get the mid section closer to the engine block to miss the fan blades.
Race Director
Joined: Apr 2009
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From: Charlotte NC
It is only common sense ( in my opinion) that a metal frame that is as old as these frames are getting are not as fatigued-free as they were when they were built. Thus one should not expect it to react the same to forces as it did 40 years ago....especially if it has been subjected to previous damage, rust and other factors.
DUB
Le Mans Master
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From: Powassan ON
Team Owner
Joined: Jun 2001
Posts: 23,367
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From: Virginia USA
but I didn't go 3/4. I went just enough to take up all the slack.I didn't really notice a big difference going over bumps but my car is a flexible convertible but I'm sure it helps. I did notice a huge difference in steering response.
Nice job.