BlueTR3A-5EKT Posted December 10, 2021 Report Share Posted December 10, 2021 (edited) Bit of a sidestep here. Have you looked at the TR7/8 gearbox mount? one big stud up the centre of it that drops through the big hole in the mounting. The mount sits in a steel bracket with a big square hole cut in it. TR7 mount Edited December 10, 2021 by BlueTR3A-5EKT Quote Link to post Share on other sites
rcreweread Posted December 10, 2021 Report Share Posted December 10, 2021 Isn't that the same as a Dolly Sprint one as well? Cheers Rich Quote Link to post Share on other sites
BlueTR3A-5EKT Posted December 10, 2021 Report Share Posted December 10, 2021 5 minutes ago, rcreweread said: Isn't that the same as a Dolly Sprint one as well? Cheers Rich Same style. Different part numbers. 218559 is Sprint. TKC1044 is wedge. Physical differences I do not know. May be just hardness. Quote Link to post Share on other sites
stuart Posted December 10, 2021 Report Share Posted December 10, 2021 16 minutes ago, BlueTR3A-5EKT said: Same style. Different part numbers. 218559 is Sprint. TKC1044 is wedge. Physical differences I do not know. May be just hardness. Theyre having trouble with the quality of the 7 ones now apparently, they dont last five minutes so theyre using a Volvo one instead. Stuart. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted December 10, 2021 Report Share Posted December 10, 2021 (edited) 11 minutes ago, stuart said: Theyre having trouble with the quality of the 7 ones now apparently, they dont last five minutes so theyre using a Volvo one instead. Stuart. Yes I have just read that and cannot find a working link to the TR7triumph.com web forum. Which Volvo? The 240 that used the J o/d? With the swag mount bracket? Volvo 740 - 960. Edited December 10, 2021 by BlueTR3A-5EKT Quote Link to post Share on other sites
stuart Posted December 10, 2021 Report Share Posted December 10, 2021 31 minutes ago, BlueTR3A-5EKT said: Yes I have just read that and cannot find a working link to the TR7triumph.com web forum. Which Volvo? The 240 that used the J o/d? With the swag mount bracket? Volvo 740 - 960. Yes I think thats the one. Stuart. Quote Link to post Share on other sites
Z320 Posted December 10, 2021 Author Report Share Posted December 10, 2021 (edited) Folks, you want to challenge me? Edited December 11, 2021 by Z320 Quote Link to post Share on other sites
Z320 Posted December 11, 2021 Author Report Share Posted December 11, 2021 (edited) Still the same situation this morning Next I made two wodden wedges and fixed them on my "dummy frame" - they are the position of the rubber mounts. And fixed the whole stuff there. With the TR gearbox off and item 54 off only item 50 remains in the position we have to connect the LT77 to (hopefully) And it happened what I was afraid of - the outgoing flange is 10 cm closer to the engine and hits item 54. The new bracket has to be based on the rubber mounts, item 50+54 did a great job - and sadly only have been needed some hours. The new bracket will look about like this, material is 5 mm steel. Yes, I will add 3 cross connections for more stiffness. That's it for today Ciao, Marco Edited December 11, 2021 by Z320 Quote Link to post Share on other sites
Z320 Posted December 18, 2021 Author Report Share Posted December 18, 2021 (edited) Hi, this was a busy week - at my office and at my workshop. That's what the bracket is now, the rear end some degree angled, and I decided to make it to use it with a aluminium spacer at the front end. My decision for the small wing to the gearbox was this morning for some reason, my first idea was without. Mostly I'm pleased with my welding seams and hopefully the black paint hides the bad ones (but all are solid). For making the bracket the LT77 gearbox AND the wooden model was very useful The LT77 will go the Jochem (one day...), so for any reason I'm making a wooden model... What will be next? Jochem send me a box of bits and pieces to check the way of travel of the original and our modyfied shifting gate. So next I will finish the excenter. And Jochem did some measurement this week with his new clutch mechanism and friction plate To fit a concentric release bearing, that works easier with the LT77 than with the TR gearbox. The one I made for him 2 years ago was never used and I will bring it up to TR4A specification and sell it. That's it for today, Ciao, Marco Edited December 18, 2021 by Z320 Quote Link to post Share on other sites
Chris59 Posted December 18, 2021 Report Share Posted December 18, 2021 (edited) M2P : take care, the flat spring bolted to the gearbox extension (bottom of the gear lever) need to be able to move, but bolted by 4 points. Edited December 18, 2021 by Chris59 Quote Link to post Share on other sites
JochemsTR Posted December 19, 2021 Report Share Posted December 19, 2021 9 hours ago, Chris59 said: M2P : take care, the flat spring bolted to the gearbox extension (bottom of the gear lever) need to be able to move, but bolted by 4 points. Hi Chris, you are referring to this spring, correct? Yes, we plan to keep this in its entirely. Quote Link to post Share on other sites
Chris59 Posted December 19, 2021 Report Share Posted December 19, 2021 15 hours ago, JochemsTR said: Hi Chris, you are referring to this spring, correct? Yes, we plan to keep this in its entirely. Yes, it need to be attached to the gearbox by 2x2 points, will little capacity to move. Quote Link to post Share on other sites
Z320 Posted December 22, 2021 Author Report Share Posted December 22, 2021 (edited) Hi there, the last days I gave some attention to the offset of the excenter. To give any thoughts on this was not needed at all on my MX5 gearbox project. The one on thr right side is the first one I made with an "likely" offset, the left I have to finish with the correct offset. This is about how I hope to find out. First I had to realise; THIS shifting gate is a gearbox (believe it or not)! You can't see gears? I show you. This is the the 1st and 2nd gear, the ratio is abot 2.1 / 1 - this speeds the shaft (coming from the right side) up! (the ratio is only about 2.1 with small deflection, the ratio rises on more deflection because the shifter lever slides through the rose joint) The 3rd gear is on the same shaft, the 4th gear is on the shifter shaft (length is only possible to guess), the ration starts at about 1.4 / 1, this also speeds up the shaft. The total ratio is about 2,1 x 1,4 = 3 By making the shifting gate shorter I kicked out the 2nd and 3rd gear and now only have the 1st and have to determain the 4st, now 2nd. Today I checked what I only had in my mind. First with an (ugly greasy) orginal shifting gate first, a short stoke on my scale is 5°, a long one 10°, the indicator adjusted to a long stroke Moving the shifter lever 5° sidewards (App on my IPhone) gives 15° on the shifter shaft. I'm very pleased with my calculation... Next with the reverse gear release in position: the lower end of the lever stops after moving only about 3.5°, this is the 1-N-2 gate Next with the alread shorter shifting gate and gear lever direct in my experimental excenter. TOTAL OVERDO! Some degrees less than 30° by moving the lever less than 4°, The ratio is about 1 : 8 to 1 : 10! Now I know what to do and hope I have the space to manage it (others did it too, so I guess I get it suitable). Guys who told us it is easy to get a LT77 gearbox in a TR6 in my opinion are wrong and never did it. That's it for today. Ciao, Marco Edited December 23, 2021 by Z320 Quote Link to post Share on other sites
Z320 Posted December 23, 2021 Author Report Share Posted December 23, 2021 Hi again, the needed dimension of the excenter I realised with a "washer" bolted on my adapter and hoped my calculation is correct. If not, I could bolt another one on the adapter First test ...and it "worked well" But the rose joint hits the reverse release .... item For the photo I aready lowered it with a wire between the bolts and the .... item Anyway it is not possible to move the lever to the right (the rose joint to the left) I think I have to make the whole issue new, but I'm afraid this is anyway the case, because the mechanism is MUCH too wide to the right side for the console of the H-frame. Please compare how tall the TR mechanism is To me it seems a LT77 gearbox is not much easier to fit on a TR than a MX5 gearbox.... Ciao, Marco Quote Link to post Share on other sites
stuart Posted December 24, 2021 Report Share Posted December 24, 2021 (edited) TBH Im not too sure why you would want one of those boxes as apart from as an engineering exercise they were never that good anyway, If you want an alternative box then the Ford T5 as used on the Sierra Cosworth is a great box and pretty bomb proof, back in the 80`s we were racing an XJS V12 with one of those boxes fitted to it and we never broke it in 3 seasons racing. Stuart Edited December 24, 2021 by stuart Quote Link to post Share on other sites
Z320 Posted December 24, 2021 Author Report Share Posted December 24, 2021 (edited) Thank you for this very interesting advice. Also to be honest: I‘m only helping Jochem, the LT77 has been recommended to him. Maybe I should stop reporting, if the LT77 is not a good choice…..? Edited December 24, 2021 by Z320 Quote Link to post Share on other sites
JochemsTR Posted December 24, 2021 Report Share Posted December 24, 2021 The LT77 is a good choice. It belongs to Triumph. There are better choices, there are worse choices. Maybe one should look at the achievements made, vs the problems still out there. Jochem Quote Link to post Share on other sites
ntc Posted December 24, 2021 Report Share Posted December 24, 2021 1 hour ago, stuart said: TBH Im not too sure why you would want one of those boxes as apart from as an engineering exercise they were never that good anyway, If you want an alternative box then the Ford T5 as used on the Sierra Cosworth is a great box and pretty bomb proof, back in the 80`s we were racing an XJS V12 with one of those boxes fitted to it and we never broke it in 3 seasons racing. Stuart +1 and I used them in rallying years ago with BDA engine’s Quote Link to post Share on other sites
Z320 Posted December 27, 2021 Author Report Share Posted December 27, 2021 (edited) After a 2 days brake today I made the reverse mechanism issue as slim as possible A hacksaw job After sandblasting first a test welding welded from both sides hopefully slim enough next I will fit the release master, that is pretty easy on the LT77, there is space enough because of some reasons I can use the original aluminium backplate this time with a spacer / distancer, calculated to Jochem's measurement Tomorrow it will be finished. Ciao, Marco Edited December 28, 2021 by Z320 Quote Link to post Share on other sites
Z320 Posted December 28, 2021 Author Report Share Posted December 28, 2021 (edited) Today I modyfied the front gearbox cover and its "nose" The LT77 gearbox shaft is not such monster like on the TR gearbox, this is why not much work is needed (some of you may know my post about fitting a Sachs release cylinder on my TR gearbox). First fitting a trust strap to avoid spinning, this is the only fixing The spacer / distancer has a tight fit The backplate with the hydraulic cylinder also. The piping I offered Jochem to do in copper, he want's o do it different. What I finaly had to do is to make the toothed Shaft some [mm] shorter. With a new cutting insert and because the gearboox is in pieces that worked very well Another possibility is to modify the pilot bearing.... Well....my part of the job is done and the LT77 has to go, Thursday Jochem will pick it up. And perhaps he will continue the story? That's it from me for the moment, ready for a brake before a new challenge. Ciao, Marco Edited December 28, 2021 by Z320 Quote Link to post Share on other sites
JochemsTR Posted December 29, 2021 Report Share Posted December 29, 2021 (edited) With this project, we primarily wanted to show that other transmissions such as Mazda or LT77 can be installed in a TR6. Marco has described the Mazda conversion already in detail here. To my knowledge an LT77 conversion described in this detail is only shown here so far. Of course there are a few other alternatives. BMW Getrag, Ford T5 .... BUT: these are merely statements. "Just install this, I would just use that". This project shows once again that you have to deal with small details for a very long time. Not only the procurement of parts can be problematic (Getrag gearboxes are not found everywhere), but the technical challenges and concepts are rarely addressed. Regardless of what is mentioned, if you don't want to compromise, and a transmission is really supposed to be installed one-to-one in a TR6, there is no plug-and-play solution. Marco, many thanks for your help. Jochem Edited December 29, 2021 by JochemsTR Quote Link to post Share on other sites
BlueTR3A-5EKT Posted December 29, 2021 Report Share Posted December 29, 2021 Nice solution to complete a specific conversion. Looks like a lot less effort than the Magda ‘box fitting as the mounting/matching to the engine was already done by BL transmissions. Logical really. Peter W Quote Link to post Share on other sites
stillp Posted December 29, 2021 Report Share Posted December 29, 2021 3 hours ago, BlueTR3A-5EKT said: Nice solution to complete a specific conversion. Looks like a lot less effort than the Magda ‘box fitting as the mounting/matching to the engine was already done by BL transmissions. Logical really. Peter W Not often you see "logical" and "BL" in the same paragraph! Pete Quote Link to post Share on other sites
stuart Posted December 29, 2021 Report Share Posted December 29, 2021 1 minute ago, stillp said: Not often you see "logical" and "BL" in the same paragraph! Pete Especially not where BL was concerned Stuart. Quote Link to post Share on other sites
tthomson Posted December 29, 2021 Report Share Posted December 29, 2021 I always understood BL to mean "Bloody Liability" 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.