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Help Identifying Engine Please


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#1 mr cooke

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Posted 25 June 2017 - 09:54 AM

Hi all , can anyone help identifying a 1275 engine , I am trying to find out as much info as possible like the BHP . 

what i know about the engine in come out if a D reg 1986 city e Reg number D726 DUE . All of the engine number is not clear the

bits i can read are 12A2B??? 279171.

Any help would be grate full  



#2 Chris.Williams

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Posted 25 June 2017 - 10:10 AM

Enter the details into here
http://www.guess-wor...Tech/engine.htm

#3 THE ANORAK

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Posted 25 June 2017 - 10:19 AM

1275 would not be standard on a 1986 mini, so that reg number may not help very much



#4 mr cooke

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Posted 25 June 2017 - 10:24 AM

Thanks were will i find the engine code. 



#5 Spider

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Posted 25 June 2017 - 10:32 AM

It was originally a circa 1991 manufactured 1275, fitted with a HIF44 Carb, unleaded head and Catalytic Converter.



#6 THE ANORAK

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Posted 25 June 2017 - 11:36 AM

Sounds like a mainstream cooper engine.

#7 r3k1355

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Posted 26 June 2017 - 10:41 AM

Sounds like a mainstream cooper engine.

 

Weren't most of those injection though?



#8 THE ANORAK

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Posted 26 June 2017 - 11:40 AM

Nope, thats the injection cooper.
The mainstream is so called because its the mainstream (production) version of the Cooper RSP limited edition. Has the same engine minus the oil cooler.

All the name tags are retro added to distinguish the production development... RSP, mainstream, injection.
When the multi point injection was added it became RSP, mainstream, Spi, Mpi.

#9 Cooperman

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Posted 26 June 2017 - 01:42 PM

When I used a Mainstream Cooper engine in a competition car build I got a lot of conflicting information. The engine had to be technically 'standard', so I needed to carefully build it by 'blueprinting' as far as possible.

 

When it came to it I could not determine which cam was standard. Yes, there were lots of opinions from other 'experts', but in the end it seemed that ARG fitted whatever cams they had in stock. Then the valve sizes were conflicting. When I stripped the original engine it had 33.5 mm inlets, but the Haynes Manual quotes 35.6 mm.(i.e. MG Metro size).

 

The conclusions I came to were that ARG fitted whatever they had in stock and I had this confirmed by an ex-ARG purchasing person who said that they were, at that time, not paying their suppliers on time and that deliveries is specific parts, like cams, could be delayed, so tin order to keep the line flowing they fitted whatever they had 'on the shelves'.

 

In the end I bored it to 1330 cc, as permitted, used an MG Metro cam and head, skimmed the head by 0.027", the allowable standard service skim being 0.025" (a scrutineer could not measure to within 0.002" and that would be an allowable tolerance anyway). I flowed the carb and cleaned the casting flash from the manifold. The head ports were 'improved' slightly, but not so much as to be noticeable if inspected. I fitted a Mk.1 Cooper 'S' rocker shaft and Aldon customised a dizzy for me. With a few other 'tweaks' it gave 84 bhp at the flywheel 5700 rpm.

 

It is hard to be specific about any Mainstream Cooper engine without stripping it down.



#10 THE ANORAK

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Posted 26 June 2017 - 02:05 PM

That explains why there has always been a disagreement on what cam they should have.

Thanks for that info :-)




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