iain Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Has anyone got drawings of the various chassis strengthening pieces?The price charged by the usual suspects for these is a touch ridiculous! Iain Edited December 9, 2019 by iain Quote Link to post Share on other sites
ChrisR-4A Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Hi Iain, before you look elsewhere check out this previous forum content : http://tr4a.weebly.com/chassis-strengthening-kit-welding.html The exact dimensions of the reinforcing brackets is not as important as the basic principal, if it ends up looking similar to the video then it should be ok. Having said that if someone has precise drawings then please add them. PS: I made my own, rule of thumb, 15 years ago and there ok so far. Regards Chris Edited December 9, 2019 by ChrisR-4A Quote Link to post Share on other sites
iain Posted December 9, 2019 Author Report Share Posted December 9, 2019 Hi Chris , thanks for that, that’s a great reference site, bookmarked some time ago. Just wondered if anyone had templated these pieces as they are pretty basic and don’t justify the cost in my mind. If not it’s out with the card board and scissors! Iain Quote Link to post Share on other sites
ChrisR-4A Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) At least with the cardboard and cissors Iain you will know there going to fit. When you do have a valid steel bracket make sure you position it so you have access for the welding nozzle from both sides. Edited December 9, 2019 by ChrisR-4A Quote Link to post Share on other sites
ChrisR-4A Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Error Edited December 9, 2019 by ChrisR-4A Error Quote Link to post Share on other sites
ChrisR-4A Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Error Edited December 9, 2019 by ChrisR-4A Quote Link to post Share on other sites
iain Posted December 9, 2019 Author Report Share Posted December 9, 2019 Good tip, cheers Quote Link to post Share on other sites
Malbaby Posted December 9, 2019 Report Share Posted December 9, 2019 (edited) Welding braces between the tops of the 2 diff bridges and boxing the bottom of the bridges where they meet the chassis helps. The rear chassis flex is the main design flaw with the IRS chassis...This occurs immediately behind the main diff bridge I welded one metre long steel plates to the inside of the chassis rails [between the lips] in that weak area on my car. The standard 65mm x 8mm wide plate that is readily available fits snug. Also removed the ribbed triangular shaped [breast] plate that is welded to where the main chassis and trailing arm rails meet and replaced it with a thicker and wider plate. Edited December 10, 2019 by Malbaby Quote Link to post Share on other sites
Geko Posted December 10, 2019 Report Share Posted December 10, 2019 Having gone through this I came to the conclusion that the simplest and most effective solution to reduce chassis flex is to add a second breast plate just like on TR6. Quote Link to post Share on other sites
ctc77965o Posted December 10, 2019 Report Share Posted December 10, 2019 If you DIY, which I fully support - it's just flat plates to weld on - make sure there's drainage points...don't weld-up an initially-strong rust-trap Quote Link to post Share on other sites
ChrisR-4A Posted December 10, 2019 Report Share Posted December 10, 2019 16 hours ago, ctc77965o said: If you DIY, which I fully support - it's just flat plates to weld on - make sure there's drainage points...don't weld-up an initially-strong rust-trap There flat in one plane but usually have a right angle return edge about 6mm wide opposite the welded sides. This stops the flat plate flexing and adds strength. Chris Quote Link to post Share on other sites
rvwp Posted December 12, 2019 Report Share Posted December 12, 2019 Hi Ian, Moss have 30% off the front end strengthening kits at the moment. May make it more palatable at the reduced price and save a lot of effort especially bending over the top edges of the pieces which gives them the strength. The rest of the strengthening plates at the rear are easy to make. Rich Quote Link to post Share on other sites
iain Posted December 12, 2019 Author Report Share Posted December 12, 2019 Good point Rich Iain Quote Link to post Share on other sites
PaulAnderson Posted December 14, 2019 Report Share Posted December 14, 2019 On 12/10/2019 at 12:09 AM, Geko said: Having gone through this I came to the conclusion that the simplest and most effective solution to reduce chassis flex is to add a second breast plate just like on TR6. Is that the upper (T shirt?) as seen at https://parts.trgb.co.uk/collections/chassis-and-bodywork/products/chassis-breast-plate-upper-tr4a-6 Does it fit without obstruction and does it make a noticeable difference in rigidity? Paul Quote Link to post Share on other sites
iain Posted December 14, 2019 Author Report Share Posted December 14, 2019 I have had this very discussion with Stuart this week and his reply was that if that the chassis is in good condition, then no, the hoop arrangement of the TR4a standard chassis is good. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.