Triumph Sports Cars
engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)
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Re: 76 TR6 with GM 3.6 LFX
I see that you have done some strengthening of the mid/front chassis.
Have you considered further strengthening at the rear to minimise the flex and twist that occurs at the cruciform? |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: 76 TR6 with GM 3.6 LFX
Also the differential mount points may need to be beefed up a bit.
Jim |
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Re: 76 TR6 with GM 3.6 LFX
Thanks, both of those areas are what I'm working on next, right now I'm taking all the suspension off.
I'm trying to decide on the best way with the least amount of weight added. The twisting is something I'm most concerned about Any suggestions besides the kits already offered? One idea I've been kicking around is a support inside the cabin tying the frame outriggers too the pedestal I know I might not be able to because of the seats or getting it to sit flat against the floor, but this is something i want to explore Edited 1 time(s). Last edit at 11/30/2022 09:51PM by Kard150. |
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Re: 76 TR6 with GM 3.6 LFX
Kenny, IMHO...you will have problems with the rear chassis unless substantial strengthening is done....extra weight is unavoidable.
The flex and twist occurs at the weak sections where indicated. I have completed various strengthening measures on my project car. One being,,,,welded in 8mm x 65mm plates 900mm long to the insides of the middle chassis rails, centred at the cruciform area. Your idea of welding in braces that encroaches into the cockpit is valid. I achieved a similar outcome with chassis modifications. Edited 1 time(s). Last edit at 12/01/2022 04:15PM by malbaby. |
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Re: 76 TR6 with GM 3.6 LFX
Malcom you mention "various strengthening measures", was this something you did all at once or an evolution of modifications?
Do you have any pictures available? I did reinforce the upper t shirt area at the back where it forms an "arch" by adding a strap inside. I've got to replace the lower T shirt which is when i will add a wider strap under and tie it together. I just dont believe that is enough. As for the weight i just meant i wanted to look for the best idea with the least penalty, Strength being the 1st priority but not go crazy. I'm open to all suggestions. Kenny |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: 76 TR6 with GM 3.6 LFX
I'd avoid encroaching on the cockpit, it will add complications, although if you do opt for a roll structure of any kind it becomes more reasonable.
Crossways round tube members of large diameter are often used to brace long frame members against twisting force. Perhaps that principle can be put to use. Plating suspension attachment points is a sensible reinforcement method in the TR frame, at any and all relevant locations. Jim |
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Re: 76 TR6 with GM 3.6 LFX
My 4A factory chassis has an extra bridge forward of the main diff cross member.
My main intention was to fabricate a steel structure from the front of larger custom made cruciform plates to the rear diff support, linking the tops of all three bridges together. I also welded in a pair of flat plates so as to both bolt a roll cage directly to the chassis through the body and to provide a platform for mounts for telescopic shock conversions. Welding in plates to the insides of the centre chassis rails is the primary strengthening. I am having problems attaching pics, as my files are probably too large. |
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Re: 76 TR6 with GM 3.6 LFX
Giving some updates. Finally finished the frame mods, I plan on using a roll bar to beef up the frame.
Painted the frame and now putting it all back together. I did add to the T shirt area to stiffen it up some. some of it might just be token support but it can't hurt. One last mod to the body, at least I hope it's the last. Edited 1 time(s). Last edit at 09/10/2023 09:48PM by Kard150. |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: 76 TR6 with GM 3.6 LFX
The places where we saw failures were the attachment points for the front control arms, and at the rear the differential attachment points. I've also seen the rear control arm attachment points rust away. You might want to beef those up a bit.
Jim |
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Re: 76 TR6 with GM 3.6 LFX
I added the usual brackets, is there something besides this? I made pieces to box the whole thing in but didn't add them. Edited 1 time(s). Last edit at 09/10/2023 09:47PM by Kard150. |
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6469 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: 76 TR6 with GM 3.6 LFX
Looks pretty good to me but I'm no expert. The front control arm brackets were especially flimsy where they are bolted through the frame rails.
Jim |
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