Ausmini
It is currently Sat Sep 23, 2017 1:01 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 12 posts ] 
Author Message
 Post subject: Horsepower ratings
PostPosted: Sun Apr 02, 2017 3:21 pm 
Offline
848cc
848cc

Joined: Tue Oct 01, 2013 6:16 pm
Posts: 6
1275 Cooper S versus 1275A+ what is the horsepower difference and torque difference. Is the A+ a stronger road engine? Opinions please.
Thanks
Paul M
:?


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sun Apr 02, 2017 4:06 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sun Apr 29, 2012 1:19 pm
Posts: 2398
Location: Wollongong, NSW
Cooper S is approx 75hp / 80lb.ft
A+ varies depending on the spec, from approx 50 to 75hp (65 to 80 lb.ft)

Finding a completely stock example of any 1275 would be reasonably unusual, most have been played with to some extent. If you are going to rebuild the engine either would be a good starting point.

Good reading here:
http://www.aronline.co.uk/blogs/cars/mi ... -a-series/

_________________
Image


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sun Apr 02, 2017 4:13 pm 
Offline
848cc
848cc

Joined: Tue Oct 01, 2013 6:16 pm
Posts: 6
Thanks Timmy, that was a quick response. I'll do some reading and investigating as my engine has been rebuilt in the past, perhaps by Mini Kingdom, Cheers.


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sun Apr 02, 2017 4:22 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sun Apr 29, 2012 1:19 pm
Posts: 2398
Location: Wollongong, NSW
The other 1275 you might find is out of the late Clubman, Moke or Morris 1100S (called the Morris 1300 in the U.K. from the above link). Is has lower compression, tamer cam, single carb etc in original specification, but again can be built up to a similar spec to any other 1275.

1275 Cooper S, GT (removeable tappet covers on rear is best way to ID)
1275 Morris 1100, Clubman, Moke
1275 A+ were UK only, but many have come to Aus since.

_________________
Image


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Tue Aug 01, 2017 11:12 pm 
Offline
848cc
848cc
User avatar

Joined: Mon Sep 02, 2013 11:26 pm
Posts: 57
Location: Buderim, QLD
hi - i recently had an a+ 1380 built...117chp at 6700 - block has more strength and rigidity than earlier ones

_________________
Min - 1970 MkII S, 119hp Dave Anton 1380, SH Engineering belt drive, 1.5 rollers, 123Tune ignition, 48 DCO SP Weber, HP Headers, MSD, Maniflow ex. Swiftune SC/CR 3.7 + ATB, all KAD front, antiroll bars and gas shocks, 6 inch Minilites with Dunlop Sports


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Wed Aug 02, 2017 3:56 pm 
Offline
998cc
998cc
User avatar

Joined: Sun Jan 09, 2005 3:48 pm
Posts: 1064
Location: Kirrawee N.S.W
Just had a A+ 1310 built by mini performance centre with a NOS Mk2 Cooper s head flowed by Ian Fahey ,266 ss cam , estimate by Ian was 112 hp.

_________________
That's why it's good to be.............ME


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Fri Aug 04, 2017 10:34 pm 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 38057
Location: near Baulkham Hills, NSW
A series ones bore better for big engines. Many/most A+ blocks had sleeves in the bores due to casting porosity, and the water jackets offset relative to the bore centres.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

Image


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 2:02 pm 
Offline
1360cc
1360cc
User avatar

Joined: Sun Apr 11, 2004 11:32 am
Posts: 10666
Location: Sthrn HiLoLands, NSW, Australia
timmy201 wrote:
Cooper S is approx 75hp / 80lb.ft
A+ varies depending on the spec, from approx 50 to 75hp (65 to 80 lb.ft)


Big discussion about this just the other day...what percentage of Rover Mini's put out a nominal 75 BHP? only Cooper Models? or others optioned up with Cooper engines?

The other thing to think about when comparing Rover and say a good Aussie Cooper S is when the Rover last saw an engine diagnostic/fuel injector clean etc

and, from an on the road performance point of view...

Wouldn't Rover Minis have to push around about 100Kgs extra weight?

_________________
"Show me the Mini!"


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 4:54 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sun Apr 29, 2012 1:19 pm
Posts: 2398
Location: Wollongong, NSW
Well... I don't think any factory NA Rovers put out 75hp.. The "Cooper S" models listed on the net are John Cooper tuned minis, and not really a factory job. The best factory effort was the MG Metro from memory

1990 - Mini Cooper 1275 - 61ps / 60hp http://www.minipassionmini.50megs.com/p ... 201990.pdf

1992 - Mini Sprite & Mayfair (1275) - 50ps / 49hp 685-710kg
1992 - Mini Cooper 1.3i - 63ps / 62hp http://www.minipassionmini.50megs.com/p ... 201992.pdf

1996 - Cooper 35 edition - 63ps / 62hp http://www.minipassionmini.50megs.com/p ... 201996.pdf

1998 - Mini 1.3i & Cooper 1.3i - 63ps / 62hp http://www.minipassionmini.50megs.com/p ... 201998.pdf

Of course, you could go and spend lots of money with John Cooper...
http://www.minipassionmini.50megs.com/p ... 201992.pdf
http://www.minipassionmini.50megs.com/p ... 201994.pdf
http://www.minipassionmini.50megs.com/p ... 997-98.pdf
http://www.minipassionmini.50megs.com/p ... %20SSE.pdf

_________________
Image


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 7:31 pm 
Offline
998cc
998cc
User avatar

Joined: Thu May 18, 2006 4:57 am
Posts: 505
Location: Hamburg, Germany
timmy201 wrote:
I don't think any factory NA Rovers put out 75hp .... The best factory effort was the MG Metro from memory

correct, with 72HP

interestingly the 1990 carb Mini Cooper uses the same engine but is only rated 60HP. looks like early emissions control choked it quite a bit

_________________
Rover 214 atm ....


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sun Aug 06, 2017 8:57 am 
Offline
1275cc
1275cc
User avatar

Joined: Thu May 24, 2007 7:19 pm
Posts: 5262
Location: Yandina,Sunshine Coast,QLD
I am running a stock 1990 Rover Cooper drivetrain in my 850. I dynode it at a mini muster years ago and it did 45bhp at the wheels.
It's still going as strong now as when I first put it in my daily driver around 8 odd years ago.

_________________
Respect mine and I'll respect yours.
Image


Top
 Profile  
 
 Post subject: Re: Horsepower ratings
PostPosted: Sun Aug 06, 2017 9:03 am 
Offline
1360cc
1360cc
User avatar

Joined: Sun Apr 11, 2004 11:32 am
Posts: 10666
Location: Sthrn HiLoLands, NSW, Australia
Kennomini wrote:
I am running a stock 1990 Rover Cooper drivetrain in my 850. I dynode it at a mini muster years ago and it did 45bhp at the wheels.
It's still going as strong now as when I first put it in my daily driver around 8 odd years ago.


So allowing for 15-20% driveline losses ( :?: ) say, 50 n half BHP or more...

_________________
"Show me the Mini!"


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 2 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:  

cron

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