Ausmini
It is currently Fri Jul 04, 2025 11:01 am

Board index » Mini Chat » Mini Chat

All times are UTC + 10 hours




Post new topic Reply to topic  Page 2 of 2
  [ 24 posts ]  Go to page Previous  1, 2
  Print view Previous topic | Next topic 
Author Message
gtogreen1969
PostPosted: Mon Apr 20, 2015 8:13 pm 
Offline
1275cc
1275cc
User avatar

Joined: Fri May 02, 2008 3:07 pm
Posts: 5123
Location: The Internet
I will have to go and check mine now.
Phil 850
How high are your revs in 4th at 100kph? My revs are 4500rpm at 100kph.
Top
 Profile  
 
Phil 850
PostPosted: Mon Apr 20, 2015 10:30 pm 
Offline
998cc
998cc

Joined: Fri Aug 30, 2013 8:59 pm
Posts: 1045
Location: Western Sydney
I don't have a tachometer hence the measurement method used to find out the ratio.
By calculation from a 3.44 diff providing 25.7 kph/1000rpm you get at 100 kph:-
2.9:1. 3280 rpm
3.1:1. 3506rpm
3.44:1. 3891 rpm
3.65:1. 4129 rpm
3.765:1 4259 rpm
4.13:1. 4672 rpm
I have only once done 100kph and the engine sounded like it was screaming so that's why I investigated what diff it had.

_________________
Find a job you love and you will never have to go to work !
Top
 Profile  
 
gtogreen1969
PostPosted: Mon Apr 20, 2015 10:51 pm 
Offline
1275cc
1275cc
User avatar

Joined: Fri May 02, 2008 3:07 pm
Posts: 5123
Location: The Internet
Looks like I may have a 4.1 diff as well. Starts getting noisy at 80kph.
But mine has other issues. The muffler looks like it has been burnt so maybe someone has taken to the baffles with a gas axe. Might download one of those noise meters and see what it is.
Top
 Profile  
 
drmini in aust
PostPosted: Tue Apr 21, 2015 7:56 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
@ 100kmh (actual) GPS speed with my 3.647 diff and 10" A008s, I'm doing almost 4,400rpm.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
Top
 Profile  
 
Phil 850
PostPosted: Tue Apr 21, 2015 7:12 pm 
Offline
998cc
998cc

Joined: Fri Aug 30, 2013 8:59 pm
Posts: 1045
Location: Western Sydney
I used the data for the 3.44 cooper diff in the Orange mini manual.
I then just calculated what the other ratios would come out at. It may not be perfect but should be very close.
Image

_________________
Find a job you love and you will never have to go to work !
Top
 Profile  
 
9YaTaH
PostPosted: Tue Apr 21, 2015 8:30 pm 
Offline
1360cc
1360cc
User avatar

Joined: Sun Apr 11, 2004 11:32 am
Posts: 12390
Location: Sthrn HiLoLands, NSW, Australia
Phil 850 wrote:
I used the data for the 3.44 cooper diff in the Orange mini manual.
I then just calculated what the other ratios would come out at. It may not be perfect but should be very close.
Image


Now we need to add the recommended BHP to pull each diff with say 10" control wheels :D

_________________
"Show me the Mini!"
Top
 Profile  
 
Phil 850
PostPosted: Tue Apr 21, 2015 9:03 pm 
Offline
998cc
998cc

Joined: Fri Aug 30, 2013 8:59 pm
Posts: 1045
Location: Western Sydney
Out of curiosity, what is the maximum you would normally rev a relatively standard 1100 or 1275 to.
I'm wondering how close to running out of performance/revs those of us with low ratio diffs are ?

_________________
Find a job you love and you will never have to go to work !
Top
 Profile  
 
willy
PostPosted: Wed Apr 22, 2015 7:52 am 
Offline
1360cc
1360cc

Joined: Mon May 03, 2004 6:46 pm
Posts: 13688
Location: ADL
A standard 1098 will be out of puff by 5500rpm or earlier and around 6500 for a 1275.
Top
 Profile  
 
drmini in aust
PostPosted: Wed Apr 22, 2015 8:14 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
A stock Cooper S or Oz GT will rev to 6500 (downhill in 4th), but a stock Morris 1100S or 1275LS motor will die in the bum long before that- over 5500 is a waste of time (in the gears). :lol:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 2 of 2
  [ 24 posts ]  Go to page Previous  1, 2

Board index » Mini Chat » Mini Chat

All times are UTC + 10 hours


Who is online

Users browsing this forum: Steam and 93 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.