10 replies to this topic

[josh.goddard]

hi
i have an engine out of an austin 1300gt can anybody shed any light on the spec on one of these engines and do they have a cooper s crank in them if so can anybody tell me the spec of the crank.
Thanks josh

[clivemk1mini]

I have one and was told there basically a 1275 gt engine but I could have been miss informed

[josh.goddard]

i am actually going to be using it to build a 1340 turbo which i hope to get 200 bhp from but my engine builder has said i need to be using a cooper s crank and need to know weather its the same as the one in my engine

[James_1]

The 1300GT is not the same as a Cooper S engine. It does have an 11 stud head/block but the crank is not the same. It uses the larger big ends and isn't EN40. The head is S spec though and the conrods are better than standard. As is the crank.

[josh.goddard]

do you know the stroke of the crank at all ?

[bmcecosse]

Standard 1275 stroke. The crank is not anything special - it does not have the S head, but it does have the large inlet valve 940 head. It will not be strong enough for a turbo.....that's why they developed the turbo engine - with the better main bearings......

[62S]

The cylinder head is exactly he same as a late Mk 2 or Mk 3 Cooper S.

[James_1]

Standard 1275 stroke. The crank is not anything special - it does not have the S head, but it does have the large inlet valve 940 head. It will not be strong enough for a turbo.....that's why they developed the turbo engine - with the better main bearings......

And a standard crankshaft after the first few hundred...

[oltonlad]

the very first MG metro turbo engines used a different type of crank bearing which was soon disregarded because austin rover had major issues with them failing, many early metro turbo's were returned to main dealerships under warranty with "knocking cranks", it cost austin rover a fortune to sort it out!

i very nearly purchased a 3 year old (28,000 mile) MG metro turbo from evans halshaw back in 1986, the car was mint and my favourite colour (black), but when the salesman started it up from cold the crank rattled badly so i told him that the engine was ********d and i didn't buy it.

Edited by oltonlad, 09 June 2012 - 07:43 AM.

[Ethel]

It is pretty much the same as the very last Mk3 S / very first 1275GT's. The shorter diff made them popular for sticking in Minis back in the day.

I'd be more worried by the age than the spec for turboing, but any late A+ would be a better option.

It was the production of the crank journals, not the bearings, that let down the early A+'s.

[mk3 Cooper S]

This should help;


You should have a tufrided crank in that engine with the bigger journals.


Cooper S variants

970cc

9F/Sa/X Engine numbers 29001-29003 with Tecalamit filter

9FD/Sa/X Closed circuit breathing introduced with Tecalamit filter

9FE/Sa/X Closed circuit breathing, oil filter with oil light switch introduced

9F/Sa/X Engine numbers 29039-30029 Purolator oil filter with oil light switch and closed

circuit breathing

1070cc

9F/Sa/H Engine numbers 26501 to 33660 and 19201 to 20410

9FD/Sa/H Engine numbers 33661 to 33948 with closed circuit breathing and oil light switch in

oil filter head

1275cc

9F/Sa/Y Engine numbers 31001 to 31504 pre closed circuit breathing with Purolator oil filter

9FD/Sa/Y Closed circuit breathing with oil light switch on filter housing after engine number

32178

9FE/Sa/Y Closed circuit breathing with oil light switch on Purolator filter housing and piston

design change

9F/Sa/Y From engine number 32378 onwards, cosed circuit breathing with Purolator filter

with oil light switch, Aeg510 camshaft introduced at engine number 40006, cross-

drilled EN40Bcrank at engine number 42730 and metal dipstick tube at engine

number 42548 onwards

12H397 Cooper S Mk3 with dynamo, negative earth and Tuiftrided EN16T crankshaft

12H398 Cooper S Mk3 with alternator, negative earth and Tuftrided EN16T crankshaft



Note: Only Cooper S engines with prefix '9F' had EN40B forged steel, nitrided crankshafts. All other A-series engines had EN16T steel crankshafts which were only Tuftrided on Mk3 'S' and Austin 1300GT (ADO16) and were stamped 12G1683.





1275cc, Solid wall block (no tappet chest covers)

12G/Ta/H ADO17 shape Wolseley, Riley, MG & Vanden Plas fitted with S rods

12H379 1275GT with dynamo, negative earth, electric fuel pump and remote type gearbox

12H380 1275GT with alternator, negative earth, electric fuel pump and remote type gearbox

12H389 1275GT with dynamo, negative earth, mechanical fuel pump and remote type gearbox

12H390 1275GT with alternator, negative earth, mechanical fuel pump and remote type gearbox

12H706 1275GT with alternator, negative earth, mechanical fuel pump and rod changegearbox

12H397 Cooper S Mk3 with dynamo and negative earth

12H398 Cooper S Mk3 with alternator and negative earth

12H/-/ 1275 Austin ADO16 & Allegro

12H610/635 Innocenti Mini with duplex cam drive gears and 11-stud head

12H719/832 Innocenti Mini with simplex cam drive gears and 11-stud head

Edited by mk3 Cooper S, 10 June 2012 - 05:10 PM.