13 replies to this topic

[Badboytunes]

When I first got into Mini's ( back in the 80's ) I had an excellent book all about the Mini. It covered everything from design , production, models, engines ect ect.

 

One particular section was about the Cooper S with the 1071 engine. Im sure it also mentioned a 1081cc engine also. I dont have the book any more  and a quick serach on Google has drawn a blank. Was there ever a 1081cc engine ever made or am I imagining things...............

[The Matt]

I've never heard of a 1081cc S engine.

 

From memory, I've only heard of the 970, 997, 998, 1071 and 1275cc engines for the Cooper.

[MIGLIACARS]

 850cc to and there was a 1098cc, it was a stroked 998cc engine

 

none of which were cooper s

 

997 and 998 were cooper not cooper s

 

 

s were 970

1071

1275

Edited by MIGLIACARS, 22 August 2014 - 06:32 AM.

[Badboytunes]

Thanks for the replies guys, its wierd because I was sure........

 

What was I smoking back then?  

[The Matt]

Thanks for the replies guys, its wierd because I was sure........

 

What was I smoking back then?  

 

 

Nothing worse than what I was!

[surfblue]

Maybe a special built by the likes of Downton with a little bit of overboring?

[Dr s]

I thought the 970's and 1071's where sized to allow a rebore up to the class limits of 1000cc, 1100cc respectively?

[MIGLIACARS]

970 s and 1071 s were the same bore as the 1275

just different strokes

[Tamworthbay]

Thanks for the replies guys, its wierd because I was sure........
 
What was I smoking back then?  

don't know, but have you still got any?

[mab01uk]

If you want to know more it is all detailed in this very interesting book.......but no mention of a 1081cc



The A-Series Engine - Its First Sixty Years
by Graham Robson
Published 20/10/2011 by Haynes

 

1962 - 1970 = all A-Series 'S' type engines were produced at the Morris Engine Plant at Court House Green in north of Coventry = production of all 970, 1071 and 1275cc S engines as designed by Eddie Maher & John Cooper (& early Midget/Sprite 1275cc engines) and the short lived A-Series Diesel.

(All 'S' versions of 1275 engine continued manufacture at Morris Court House Green, Coventry until the end of production in 1970's)

 

Mainstream A-series production was at Longbridge, East Works producing 848, 998, 1098cc and which could build up to 12,000 engines and transmissions every week for the Mini and 1100 ranges with the ability to also make in-line engines for Midget, Sprite, Minor, A40, etc.

In 1968 East Works also started producing the 1275 non 'S' versions of A-Series for mainstream mass production.

 

There are also pictures of BL's OHC A-Series engine for the Mini in 1975 which had a 1097cc version, see below.

 

They featured belt drive to the overhead camshaft, single or twin-SU carbrettors and retained all the familiar A-Series features, such as the starter motor, alternator, distributor and spark plugs on the same forward facing side of the original cylinder block. There were also inline versions developed for BL's rear wheel drive cars. 11 prototypes of all sizes were built and completed 3,200 hours on test beds and 2,200 vehicle miles.
The 1275cc OHC A-Series produced 84bhp @ 6750, torque 80lb/ft @ 4,500 (against 59bhp @ 5300, torque 69lb/ft @ 3000 for the pushrod engine) in standard form.
There were also 970cc and 1097cc versions produced and tested but the project was eventually canceled due to the mounting losses of British Leyland which had become nationalised during the engines development.

 

[62S]

Various tuning companies offered large cc engines before the 1071 S appeared. Downton did a 1088cc version based on the 997 and Speedwell an 1152cc unit.

[madaboutcherry]

years ago I had a 970s bored out to 999cc.

[Cooperman]

years ago I had a 970s bored out to 999cc.

So had I. It was 970 at +0.020".

 

I suspect that the 1081 engine was a mis-print for 1071. There never was a 1081 cc 'S' engine and none of the bored out 997 or 998 units came out at 1081 cc.

 

There were some very odd sized bored/stroked 997/998/1098 engines using things like modified Imp pistons as a way to gain capacity, but with the arrival of the 1275 they sort-of went away as the 1275 was so much stronger.

[Guess-Works.com]

You'll now find someone doing a search on google reading this and then there will appear a SUPER RARE 1081 Cooper S engine on Ebay...