Re: "Patches" MD's Final Racing Project
Frome the https://alfagtv6.com/phpBB3/viewtopic.php?f=9&t=4722 thread.
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Re: "Patches" MD's Final Racing Project
Thank you. Job done. Got info.
Transaxle Alfas Haul More Arse
Re: "Patches" MD's Final Racing Project
Time for small progress top up .
Starting work on the hydraulics. Will post after its complete.
Starting work on the hydraulics. Will post after its complete.
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- Save 4.5 Kg on tyre well.jpg (245 KiB) Viewed 1583 times
Transaxle Alfas Haul More Arse
Re: "Patches" MD's Final Racing Project
What's not to like about this project? It's just fantastic. Especially the roof opening for getting cheeseburger and fries takeaway orders at the local drivethru.
Dr. Alban
Re: "Patches" MD's Final Racing Project
Hole in one Zamani !
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Transaxle Alfas Haul More Arse
Re: "Patches" MD's Final Racing Project
No MD don't leave, this forum needs you! Your content is one of the best!
Dr. Alban
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Weekend Warrior
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- Location: Sydney
Re: "Patches" MD's Final Racing Project
I'll second that, love reading your updates!
OK then I'll stop bagging you about your head box...
OK then I'll stop bagging you about your head box...
Re: "Patches" MD's Final Racing Project
Even though MD is a splitter and abandoned us, I was having a think about TA breakages, especially as they are almost always the ring gear and pinion.
Now I am making a guess here about the distance from the main bearing plate and the centre of the diff housing, but I'll just use an arbitrary 300mm.
Using a material coefficient of thermal expansion calculator: https://goodcalculators.com/thermal-exp ... alculator/
300mm of Aluminium that has a temperature increase of 80*C, would have thermal expansion of 0.5328mm.
But 300mm of steel (the output shaft) would have thermal expansion for the same temperature change, of 0.312mm.
So the aluminium case would grow 0.2208mm more than the shaft would, with an 80*C increase in temperature.
By my guestimations, that would increase the ring gear to pinion clearance by, ummmm, 0.2208mm..............
I couldn't find any numbers for the ring gear to clearance/backlash numbers. But in my old Haynes manual for the Alfetta, using the special tool and the procedure in the manual, it talks about backlash numbers between 0.13 and 0.18mm.
It's probably safe to say that if during the backlash setup procedure, the case and the output shaft were heated up another 80*C, that the backlash numbers would go from being 0.13-0.18mm to 0.35-0.4mm.
Certainly food for thought and might well be justification for fabricating a steel rear half of the transaxle case. Yes it would weigh more, but the expansion of case and shaft would be (basically) the same.
Now I am making a guess here about the distance from the main bearing plate and the centre of the diff housing, but I'll just use an arbitrary 300mm.
Using a material coefficient of thermal expansion calculator: https://goodcalculators.com/thermal-exp ... alculator/
300mm of Aluminium that has a temperature increase of 80*C, would have thermal expansion of 0.5328mm.
But 300mm of steel (the output shaft) would have thermal expansion for the same temperature change, of 0.312mm.
So the aluminium case would grow 0.2208mm more than the shaft would, with an 80*C increase in temperature.
By my guestimations, that would increase the ring gear to pinion clearance by, ummmm, 0.2208mm..............
I couldn't find any numbers for the ring gear to clearance/backlash numbers. But in my old Haynes manual for the Alfetta, using the special tool and the procedure in the manual, it talks about backlash numbers between 0.13 and 0.18mm.
It's probably safe to say that if during the backlash setup procedure, the case and the output shaft were heated up another 80*C, that the backlash numbers would go from being 0.13-0.18mm to 0.35-0.4mm.
Certainly food for thought and might well be justification for fabricating a steel rear half of the transaxle case. Yes it would weigh more, but the expansion of case and shaft would be (basically) the same.