Rockie51 Posted September 28, 2020 Report Share Posted September 28, 2020 When my 4A was rebuilt, the top wishbones were put in the incorrect TR4 position ie with the bend on the inner pivot away from the top shock mount. I then read how they should be and swapped them to the correct sides. I am considering reversing them again to get more negative camber on the front wheels as suggested by Kas Kastner. Does anyone have any idea of how much this changes the camber in degrees? Rockie Quote Link to post Share on other sites
Lebro Posted September 28, 2020 Report Share Posted September 28, 2020 Very little I suspect. Bob. Quote Link to post Share on other sites
peejay4A Posted September 28, 2020 Report Share Posted September 28, 2020 Agreed. It’ll probably be considerably easier to add shims to the lower wishbone mounts. No dismantling required. Quote Link to post Share on other sites
Z320 Posted September 28, 2020 Report Share Posted September 28, 2020 The offset of the falcrum pin is about 2.25 mm, so to fit it the one or other way makes a difference of 4.5 mm on the upper wishbones in or out, with this you can calculate the difference -or just test it to find out Quote Link to post Share on other sites
Drewmotty Posted September 28, 2020 Report Share Posted September 28, 2020 I made camber blocks to offset the fulcrum mount 14mm and raise it 12mm. They were designed to be mounted with a reversed fulcrum and bring 1 deg +ve in to 1.75 deg -ve. On that basis the 9mm change gives around 2.75 deg change so 4.5 deg without raising the fulcrum may make a difference just less than half that. Quote Link to post Share on other sites
Z320 Posted September 28, 2020 Report Share Posted September 28, 2020 (edited) I made this sketch some years ago Edited September 28, 2020 by Z320 Quote Link to post Share on other sites
Malbaby Posted September 28, 2020 Report Share Posted September 28, 2020 Reverse them, as I would be interested in the before and after camber. As you know, the coil spring height also has an effect on camber. Quote Link to post Share on other sites
Rockie51 Posted September 29, 2020 Author Report Share Posted September 29, 2020 Thanks for the responses. Marco, your diagram and the page from the Workshop Manual show the fulcrum in the wrong position for 4A to 6 models as detailed in this picture. Neil Revington also has a section about this on his website. Changing the top wishbones is relatively simple as you do not have to release the spring. I will have the car on stands as I am installing solid spacers on the stub axles. I will let you know the readings before and after. I have measured the rear camber as well and found that unladen the right wheel is on -. 6 degrees while the left is on +2.7! Perhaps that is why it slung me off the track when I lifted off on a right hand bend on our on only track day! Time to fit the Goodparts adjustable brackets that have been sitting in the garage for a while. Quote Link to post Share on other sites
Z320 Posted September 29, 2020 Report Share Posted September 29, 2020 Hi Rockie51, thanks for this interesting information; I did not know...! The illustration is shown at the original TR4A workshop manual and at its german translation. This way it was on my 4A when I bought it and still is that way and it works fine. So I leave it like it is. But indeed I use no shims between the brackets of the lower wishbonesand frame and if I want a positiv camber I would have to change their orientation. Ciao, Marco Quote Link to post Share on other sites
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