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| Diff & output recommendations https://www.ausmini.com/forums/viewtopic.php?f=2&t=62058 |
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| Author: | rehab1964 [ Sun Mar 28, 2010 11:55 am ] |
| Post subject: | Diff & output recommendations |
Ms Plum runs an 1100S engine exactly as it was lifted from it's orginal home and complete with 4.2 diff, whilst this makes her go like a cut cat to about 80kph, with 10" wheels and 145 tyres she does scream and wheel spin can be a bit of a problem. I want to keep the 10" wheels and the 145's as she's a bit of a sleeper so no flares allowed, therefore the question is what diff ratio would people recommend I use? Off the line speed is nice but given where I live I do a fair bit of my toy driving at 80 or 100kph so having a reasonable level of rpm at cruising is probably most important. Ms Plum runs Cooper S discs already and I'm wondering if I should perhaps look at changing from rubber uni's while the diff is being done, what's the general recommendation atm.... steel uni's or go for pot joints? Thoughts? |
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| Author: | drmini in aust [ Sun Mar 28, 2010 12:35 pm ] |
| Post subject: | |
3.44:1 works nice and is easy to find S/H. Most rodchange boxes here used them, apart from the Cooper S. A 3.1 or 3.2 would be good but were never sold here, you would need to get one her off a Rover front cut (maybe), or import it from UK. Forget steel unis, fit pot joints whilst the diff is out. More reliable and less power loss. 
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| Author: | VulcanBB18 [ Sun Mar 28, 2010 2:53 pm ] |
| Post subject: | |
+1 on the 3.44. Still zippy but not revving its tits off on the highway. Pot joints get a thumbs up from me but rubber unis can be fine if they're kept oil free and the rest of the associated setup is in good nick. cheers Jacob |
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| Author: | drmini in aust [ Sun Mar 28, 2010 3:14 pm ] |
| Post subject: | |
Rubber joints available currently are crap compared to the originals. I'd go the pot joints... |
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| Author: | rehab1964 [ Sun Mar 28, 2010 6:37 pm ] |
| Post subject: | |
Thanks guys, Doc did I read recently that the Rover diffs are physically bigger and don't fit in the standard housing without maching? Would this apply to Morris 1100 diff housings too? |
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| Author: | drmini in aust [ Sun Mar 28, 2010 7:27 pm ] |
| Post subject: | |
No it's the AUTOMATIC CW/Ps that won't fit into a manual box. They are bigger. A Rover diff is same as the old ones, except: 1. The copper thrust washers have tabs into the diff centre so they don't spin like the old A series ones. 2. The crownwheel & pinion tooth form is a different angle. But they do fit in old boxes fine, as a SET. [edit] on diff ratios 3.1 and taller (2.95 etc) in old boxes, the 3rd motion shaft bearing retainer often needs machining out a couple of mm to clear the bigger pinion. 5 minute job in a lathe. Yes this includes the 1100 box. |
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