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 Post subject: Horsepower ratings
PostPosted: Sun Apr 02, 2017 3:21 pm 
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848cc
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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
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 Post subject: Re: Horsepower ratings
PostPosted: Sun Apr 02, 2017 4:06 pm 
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Joined: Sun Apr 29, 2012 1:19 pm
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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/

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


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 Post subject: Re: Horsepower ratings
PostPosted: Sun Apr 02, 2017 4:22 pm 
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1275cc
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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.

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 Post subject: Re: Horsepower ratings
PostPosted: Tue Aug 01, 2017 11:12 pm 
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Location: Buderim, QLD
hi - i recently had an a+ 1380 built...117chp at 6700 - block has more strength and rigidity than earlier ones

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 Post subject: Re: Horsepower ratings
PostPosted: Wed Aug 02, 2017 3:56 pm 
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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.

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 Post subject: Re: Horsepower ratings
PostPosted: Fri Aug 04, 2017 10:34 pm 
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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.

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 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 2:02 pm 
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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?

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 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 4:54 pm 
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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

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 Post subject: Re: Horsepower ratings
PostPosted: Sat Aug 05, 2017 7:31 pm 
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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

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 Post subject: Re: Horsepower ratings
PostPosted: Sun Aug 06, 2017 8:57 am 
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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.

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 Post subject: Re: Horsepower ratings
PostPosted: Sun Aug 06, 2017 9:03 am 
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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...

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