BlueTR3A-5EKT Posted January 9, 2022 Report Share Posted January 9, 2022 Under acceleration or deceleration the input flange rises or falls due to torque reaction unless the axle is located by additional metalwork like Watts linkage or Panhard rod to stop sideways movement on cornering. The movement is due to Newton. “To every action there is an equal and opposite reaction.” Anti tramp bars reduce the axle wind up issue See Healey axle modified. I think the input flange at rest is slightly tipped like an IRS axle. In truth I have never looked. Quote Link to post Share on other sites
Charlie D Posted January 9, 2022 Report Share Posted January 9, 2022 Unless I’m seeing it wrong, in that picture, isn’t the arm of the lift sitting on the bracket of the anti tramp bar. Not the safest place to position it, surely? I can picture it bending the bracket sideways. Charlie Quote Link to post Share on other sites
Z320 Posted January 9, 2022 Author Report Share Posted January 9, 2022 I found this at the internet, for me it seems to be 90° to the ground? Why do I ask? To have the flanges parallel is correct, but only some degrees not parallel perhaps is not noticeable? This is why I let my spacers on the car at the monment as part of the experimental use of my TR4A (I'm a bit lazy of working on it). Currently my lovely wife gave me some challanges which are more fascinating. Ciao, Marco Quote Link to post Share on other sites
stuart Posted January 9, 2022 Report Share Posted January 9, 2022 Non IRS 4a axles do sit at an angle too. Stuart. Quote Link to post Share on other sites
Z320 Posted January 9, 2022 Author Report Share Posted January 9, 2022 DOWN!!!! Quote Link to post Share on other sites
Z320 Posted January 9, 2022 Author Report Share Posted January 9, 2022 Sorry me, I was shocked! Thank you Stuart for this photo Quote Link to post Share on other sites
BlueTR3A-5EKT Posted January 9, 2022 Report Share Posted January 9, 2022 6 hours ago, Charlie D said: Unless I’m seeing it wrong, in that picture, isn’t the arm of the lift sitting on the bracket of the anti tramp bar. Not the safest place to position it, surely? I can picture it bending the bracket sideways. Charlie It’s only a Healey 100 with a small block Chevy, so not worth a lot. Quote Link to post Share on other sites
stillp Posted January 9, 2022 Report Share Posted January 9, 2022 Quote Link to post Share on other sites
stuart Posted January 10, 2022 Report Share Posted January 10, 2022 16 hours ago, BlueTR3A-5EKT said: It’s only a Healey 100 with a small block Chevy, so not worth a lot. Thats true, how to devalue a car the US way. Stuart. Quote Link to post Share on other sites
Z320 Posted March 1, 2023 Author Report Share Posted March 1, 2023 Hi there, when the weather conditions become warmer I want to correct this issue. 2022 I noticed vibartions driving faster than 130 km/h from the diff which I leveld 2022. As I know now the diff has to be angled the same amount as the (TR) engine/gearbox - in Z (IRS) or W (solid axle) orientation. In some puplications I found a maximum tolerable difference of +/- 0,25°, better zero. My engine and gearbox is not original fixed on both ends, today I checked the angle in 2 different ways with 1,65° and 1,70°. Next I will take the alu spacers out again, make them shorter by my calculation and I hope this will match. Still I'm sorry for any irritation I caused. Ciao, Marco Quote Link to post Share on other sites
Z320 Posted March 10, 2023 Author Report Share Posted March 10, 2023 (edited) OK, done. my engine is a bit lowered and angled 1.7° --> I don't know how much this originaly was. My diff was shimmed and angled by my fault 0°, spacer out it is with my PUs 3,35°, I reduced the spacer, angle is 1.7° now on the first attempt. Both, engine and diff, are now the same. Sadly no test drive now because the gb has to go out next. Ciao, Marco Edited March 11, 2023 by Z320 Quote Link to post Share on other sites
Z320 Posted May 28, 2023 Author Report Share Posted May 28, 2023 Hi, I had a test drive yesterday with some distance faster than 130 km/h and my impression is: all vibrations from the diff are gone - and even more than I expected. “Sadly“ I have no original TR4A IRS anymore to measure, but my impression is: engine/gearbox and diff are originally not angled the same amount, the diff more…. Perhaps someone else wants to find out? Ciao, Marco Quote Link to post Share on other sites
TRier Posted June 2, 2023 Report Share Posted June 2, 2023 (edited) Are you of the opinion then that engine/gearbox and diff at the same angle is best? I know the propshaft doesn't run at zero degrees off the diff flange but assumed that the optimal then would be the propshaft offset by X (15 degrees I believe?) to the diff and the engine/gearbox by the same angle. You seem to be confirming that? Niall Edited June 2, 2023 by TRier Quote Link to post Share on other sites
Z320 Posted June 2, 2023 Author Report Share Posted June 2, 2023 5 hours ago, TRier said: Are you of the opinion then that engine/gearbox and diff at the same angle is best? Yes 5 hours ago, TRier said: I know the propshaft doesn't run at zero degrees off the diff flange but assumed that the optimal then would be the propshaft offset by X (15 degrees I believe?) to the diff and the engine/gearbox by the same angle. You seem to be confirming that? Sorry me, I can't follow you. Do you have a sketch or a photo? Quote Link to post Share on other sites
Anschutz Posted July 3, 2023 Report Share Posted July 3, 2023 On 1/8/2022 at 11:35 PM, Z320 said: Hi folks, very good TRier asked that, it reminded me today on a video I've seen years ago at Youtube. The engine / gearbox unit in our TRs is slightly angled about 5° in the frame (the outgoing flange of the gearbox is lower than the front end of the crankshaft). For constant velocity of the diff flange, the flanges of the diff and gearbox have to be parallel --> means the diff has to be angled the same amount as the engine / gearbox unit is angled. This is why the IRS diff is mounted in the frame as it is and I have to take my alu spacers out again. I not realised any problem / vibration until now, but I did not drive faster than 90 km/h since fitted. Sorry me for my @&5$§!!@ writing above and for any irritation I caused, I should have known better. Ciao, Marco Perhaps CV joints are not the wonderful answer to all our problems? Quote Link to post Share on other sites
Lebro Posted July 3, 2023 Report Share Posted July 3, 2023 Shame he did not show how it worked. Bob Quote Link to post Share on other sites
Motorsport Mickey Posted July 3, 2023 Report Share Posted July 3, 2023 3 hours ago, Anschutz said: Perhaps CV joints are not the wonderful answer to all our problems? Perhaps the market place has judged CV joints and...think they are just fine as they are. Thompson couplings information as of 2019 Thompson couplings.docx Mick Richards Quote Link to post Share on other sites
RobH Posted July 3, 2023 Report Share Posted July 3, 2023 18 minutes ago, Lebro said: Shame he did not show how it worked. Seems complicated but I think in essence it looks like two hooke joints in series, but configured co-axially so there is no shaft between them. Quote Link to post Share on other sites
Z320 Posted July 4, 2023 Author Report Share Posted July 4, 2023 11 hours ago, Anschutz said: Perhaps CV joints are not the wonderful answer to all our problems? Thank you for the video. Are there street cars known using Thompson joints? Much more simple for the propshaft’s joints would be the engine and a IRS diff not angled and without offset? Ciao, Marco Quote Link to post Share on other sites
Z320 Posted July 4, 2023 Author Report Share Posted July 4, 2023 (edited) Back from a 1,000 km tour on small roads and the Autobahn too, I‘m very pleased with the power drain of my TR4A now. Sadly nobody here wants to measure and post the original angle of the IRS 4 and 6 cylinder engines, to find out about a possibility general improvement on this construction. On the solid axle the angle of the diff changes constantly, to change this I don’t have enough fantasy (and no solid axle car). Ciao, Marco Edited July 4, 2023 by Z320 Quote Link to post Share on other sites
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