24 replies to this topic

[JackM]

Hello,

Something that i need to clear,

What is the difference between the standard 1275 and the 1275GT? why is more powerful and how can someone make a standard one have the GT's power?

Thanks

[Sir Cheat]

They are not as powerfull as people make out, I think they just had a closer gearbox ratio.

[JackM]

They are not as powerfull as people make out, I think they just had a closer gearbox ratio.

that's all? someone told me they had better carbs but wasnt sure. is that true?

[mini_kel]

most 1275`s had 1 1/2 carbs, metro`s had 1 3/4 carbs

[Aria Aradhea]

Which "standard" 1275 are we talking about here? The Cooper S 1275 from the 60's is more powerful than the 1275GT. While the later more common 1275 as used in the Sprites and Mayfairs from 1992 would have similar performance (well, slightly lower perfomance, I think...) to the 1275GT.

[Sir Cheat]

1275GT's are not much quicker than any other 1275 its just people seem to think they are really powerfull maybe its the strips down the side of the car? its the cooper S and the 'MG' metro engines that had about 70 odd BHP. Most other 1275's have 50 to 60 ish

[THE ANORAK]

1275cc sprite and mayfair 1992 onwards = 50 bhp

1275 GT = 59 bhp

mainstream cooper (carb) = 61 bhp

1.3i cooper = 63 bhp (although this is belived to be a lie by some people)

Mpi mini = 63 bhp (all models)

origional cooper 1275 S = 76 bhp

1.3i S cooper = 77 bhp

mainstream cooper S (carb) = 78 bhp

Mpi cooper S = 86 bhp

Mpi cooper S works = 90 bhp (again belived to be a bit of a lie)


so you see the GTis actually the second "least" powerfull 1275cc engine, who ever told you different is talking arse gravy

[Dan]

It should be mentioned that those last four engines, those from the modern 'S' models are not OE engines but are actually the result of aftermarket tuning by John Cooper Garages. They can't really be compared with standard engines and in a roundup of figures it would be better to compare them against the products of other independant tuners.

As above, the 1275GT is nothing special. The only 1275 engine it produces more power than is I believe the one that's strangled by an awful open loop catalyst. Early GTs were better but the longer they made it the more boring it became. BL weren't interested in making performance models, they could barely make cars at all and were too busy trying to cover the basics.

The 1275GT difference? Marketing. It still seems to be working 30 years later.

[JackM]

oh, so the metro is more powerfull than the GT...

Thanks a lot guys this really helped me!

[Dan]

Yes, only just. The basic Metro 1275s produced 60 Bhp compared to the GT's 59 (in reality it's probably very much the same as the 1275GT engine). The MG and GTa Metros produced 73 Bhp.

[JackM]

Yes, only just. The basic Metro 1275s produced 60 Bhp compared to the GT's 59 (in reality it's probably very much the same as the 1275GT engine). The MG and GTa Metros produced 73 Bhp.

oh..
Searched a bit about them and found that an 1990 engine can be a basic or a GTa. Anyway you can recognise them?
And, how many mods will an engine need to go from 60 bhp to 70-75?

[Ethel]

The better Metro lumps had alloy inlet manifolds (though these could be fitted as an accessory to any engine). Not at all difficult to get 70-80hp out of a 1275. Just better breathing - filter, manifolds, exhaust, a bit of head porting.

[JackM]

The better Metro lumps had alloy inlet manifolds (though these could be fitted as an accessory to any engine). Not at all difficult to get 70-80hp out of a 1275. Just better breathing - filter, manifolds, exhaust, a bit of head porting.

i already have a minisport superflow exhaust with filter & manifold from the stage 1 tuning kit (the one for my 998 but they will fit ok too i guess right?). those will do anything without the head porting?

[Ethel]

Most stuff is developed with the 1275 in mind. It should fit, you'll find it's a bit closer to the car's floor than with the 998. 1275's are about 1cm taller.

[Dan]

The needle in the kit will be all wrong for a 1275.

You can tell what engine you have by checking the engine number.

Edited by Dan, 18 January 2009 - 08:41 PM.