+- SA Classic Mini Forum (https://samini.co.za)
+-- Forum: The Market Place (https://samini.co.za/forumdisplay.php?fid=20)
+--- Forum: For Sale - Mini related (https://samini.co.za/forumdisplay.php?fid=21)
+--- Thread: Freeway use final drives - All sold (/showthread.php?tid=299)
Freeway use final drives - All sold - Sean1380 - 02-29-2016
Hi guys
I have a mate in the UK who is having a major clean up, and has some crown wheel and pinions that may be of interest to us in SA.
As you are aware, our local Minis tend to run out of revs on the freeway, the 3.44 final drive in our local 1275 means you are doing around 4,600 rpm at 120kph (not sure of exact number, but am sure Boyscout or Miniac will know). and our little short stroke 1100s generally have a 3.76 diff which means probably close to 5,000 rpm at 120.
So my mate is stripping 3.1s, 3.2s and 2.9 CWP out of gearboxes.
Now to put this into perspective, a 3.2 will drop your revs in top by about 320 rpm, and a 3.1 will drop it by over 400rpm.
The longer 2.9 is really only suited to Minis with good powerful torquey engines, and not those running hairy arsed cams such as a 286 or a 296, as it will make traffic a bit of a pain in the behind :-) as it will drop your 4th gear revs at 120 by over 700 rpm.
So with this all in mind, there will be limited stock, so i just want names and diff sizes at the moment.
Prices still to be confirmed though.
Thanks
RE: freeway use final drives - u09521 - 02-29-2016
Without reading up - can you swop it out without removing the whole engine?
I keep looking for another gear - probably a 3.2 would do?
RE: freeway use final drives - Junaid - 02-29-2016
I'm interested in a 3.1, (price will determine if I can buy it)
RE: freeway use final drives - Jared Mk3 - 02-29-2016
Price dependent, I might be interested.
[split] freeway use final drives - Miniac - 02-29-2016
Unfortunately the motor needs to come out as you'll need to remove both crown wheel and pinion to do the conversion and there are lock tabs that need to be knocked flat in order to undo the bolts holding them in.
Both of these are based on the common use of 13" Rims fitted with 175/50/13 tyres...
(*)3.444 diff ratio cruising at 120km/h will be revving at +/-4350rpm
(*)3.765 diff ratio cruising at 120km/h will be revving at +/-4750rpm
The following are the 2.9, 3.1 and 3.2 equivalents there after followed by the above for ease of comparison...
2.950= +/-3695rpm
3.105= +/-3880rpm
3.211= +/-4035rpm
3.444= +/-4350rpm(*)
3.765= +/-4750rpm(*)
RE: Freeway use final drives - Sean1380 - 03-01-2016
Good info, thanks Ed
RE: Freeway use final drives - Miniac - 03-01-2016
Not a problem at all
RE: Freeway use final drives - DomMINIque - 03-01-2016
Sean I'd be keen for a 3.1 price dependent
RE: Freeway use final drives - Sean1380 - 03-02-2016
As soon as i get confirmation from my mate RE prices and the qty available, i will let you all know.
RE: Freeway use final drives - Boyscout - 03-03-2016
Here is my version,
I have also included a column to give you the rolling radius so you can check if you may have potential clearance issues.
If you guys send me a pm with your email I can share the XLS file so you can do your own calcs.