22 replies to this topic

[Guess-Works.com]

I thought some GT's did have 11 studs, but none should have tappet covers and as guessworks says they're nothing special really anyway.

Nope, never.... the GT was a BL attempt to keep somthing in the mini range to replace the Cooper S, but in reality, all it was is a fairly bog std 1275 A series stuck on a box with the Cooper S CR Helical gearset on it...

It was only ever 8.8:1 cr at it's best so didn't need 11 studs. Also the head had smaller valves, 1.3" inlet and 1.15" exhaust... and single springs

If you want an A series 1300 engine ( and can't find a cooper S ) then the 1300GT ( or Kestrel ) which ran @ 9.75:1 and 1.4" and 1.15" valves and ran double springs..

[Fozz]

Point 1...

The GT NEVER had an 11 Stud head as standard

It was only the Austin 1300GT (and similar AD016 varients) and the Cooper S which ever had an 11 stud head...

Point 2

The GT is a solid walled block, does not have tappet chests, the Cooper S was the only big bore engine with Tappet Chests...

Point 3

If fact, @ GT externally looks like any other A series big bore motor ( even if it came out of an allegro ), and to be honest is not that different internally either... I'm not even sure the GT had double springs. But it did have duplex chain, not like you're going to see that from the outside...

if it's actually an A series bock then you at least have a chance that it's original.... if it's A+ then forget it...

 

 

Are the pushrods a lil different from "standard" blocks?? i mean how they look like...they are longer than 998's, but how about the shape???

 

i dont think they have double springs, but they have a duplex chain. (found it out on my head).

 

i recently bought a Rod 1275 GT ( i hope it is)  block, but i saw the shape of the pushrods was a lil different from others.

 

 

 

are they any other points i can find out its a real 1275GT block???

the engine number plate is missing...i think the number must be 12H 706.    neg.earth, alternator, mech, fuel pump,.

 

is this correct???

 

friendly regards, Fozz.

[Guess-Works.com]

Blimey... dig that one up...

 

Once you get down to the bare bones of an A series engine, then there's very little difference between a GT and any other A series 1275. The A series pushrods do have a different head shape to the more familiar A+ rod, with the A+ being a conical sort of shape to the head where as the A series is more like a cup with flat sides, but this is common across all A series..

[Fozz]

by the way,

 

what was the Original carburator set-up for a 1275 GT engine???

 

twin HS2's or am i wrong???

 

could somebody give me the exact details about the carbs ( single, twin, needles, ....)

 

 

many thx.

[Guess-Works.com]

single hs4...

 

1275 GT 1969-71 : Carb AUD317 x 1 Needle: AUD1528DZ 

1275 GT 1971-72 : Carb AUD451 x 1 Needle: CUD1015AAR

1275 GT 1972-     : Carb AUD567 x 1 Needle: CUD1025ABB

 

You can look all this up online by following this link, I just copied the above out of my SU reference book...

 

http://sucarb.co.uk/...le=Mini Clubman

Edited by Guess-Works.com, 31 December 2013 - 10:23 AM.

[Fozz]

Guess Works, i have Rod block so it is a 1275 GT 1972-...

 

many Thx, didnt know they have a single carb.

 

 

Friendly regards, Fozz.

 

 

by the way: does it make a big difference in performance with for example HIF 44 or twin HS2 or twin HS4???

[Guess-Works.com]

If you're not worried about period specification then put an HIF44 on it... or an HS6 if you want it to look right. There's very little difference between that and twin HS2's, more torque with the twins but a boot load more hassle with the setup.  The HS4 is really too small for a 1275 in standard trim let alone one which has been upgraded.

Edited by Guess-Works.com, 31 December 2013 - 10:45 AM.

[Fozz]

So if i read well (Sorry, im a Belgian, and my knowledge of English language is not that super), :

 

* they put standard from the factory a single HS4( but i was too small for the GT engine).

 

* a HIF 44 will do a good job (better than the "standard" HS4 from the factory).

 

* A HIF 44 is much easier to set-up than twin HS2's ( which sounds very logical, single versus twin).

 

 

What is the good needle then for a HIF44??? think im gonna move that direction.....

 

 

friendly regards.