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engine numbers
https://www.ausmini.com/forums/viewtopic.php?f=2&t=3021		 Page 1 of 1
Author:  danidad [ Tue Nov 23, 2004 9:05 am ]
Post subject:  engine numbers
Does such a post already exist that explains what origin/spec different motors an heads are?? Just bought a 1275 motor and box seperated (no head) motor is stamped 12yd/Ta/H15661... I have two 10y/Ta/H motors and the valves on these are bigger than the ones i found among the bits in the other cars. The valves i found are 1 inch diameter, the 10y ones are 1 1/16. The head has 12G202 on the casting.
does any of this mean anything to anyone??
Author:  danidad [ Tue Nov 23, 2004 9:15 am ]
Post subject: 
ahh the 10y has a 66mm (roughly) bore 12y is 72 ish..
is the 10y which came from a morrie 1100 the same as the mini K??
Author:  czerial [ Tue Nov 23, 2004 9:15 am ]
Post subject: 
don't know if this hel[ps, 12/yd/ta...
is a morris 1100s motor (1275cc) and
apparently has a good crank. comes with
a 12g940 head and cooper s rockers
(mine had cooper s rods as wel but don't know
if this is standard? well i think they are??)
mine is at russell engineering at the moment being niced up.
but i think he left the country i cant seem to get in
contact with him....
Author:  danidad [ Tue Nov 23, 2004 9:31 am ]
Post subject: 
the motor had no head so i was wondering if i could use one of the 1100 ones. I can get a 12g940 bare head (crack tested) (cool xmas pressie for a 14yo girl LOL) but fitting it out will cost her another few hundred probably, and her money is going into other areas atm. I also have a 1000 motor , but from memory these are a different bore size also??
Author:  bnicho [ Tue Nov 23, 2004 11:32 am ]
Post subject: 
Small bore heads (850, 998, 1100) will not fit a 1275 block. You need a 1275 head - 12G940 or the pollution version, which I can't remember...

12Y/Ta/H engine number is indeed a Morris 1100S - which is actually a 1275. For some strange reason BMC bought out a 1275cc in a Morris 1100 shell and called it the 1100S. (Not to be confused with the Cooper S 1071cc - which are as rare as rocking horse poo)

10Y/Ta/H is regular standard Morris 1100 engine (1098c) with 12G202 head. Auto Morris 1100 has the big valve 12G295 and a different engine number. THis is the head I have on my van. :)
Author:  1380 yellow devil [ Tue Nov 23, 2004 1:14 pm ]
Post subject: 
Not all 12Y/TA/H blocks came with Cooper S rods only some. My does not have them but a Mate of mine got a 12YD/TA/H block and it had Cooper S Rods so it is possible that the D means a different style of internals.

Not to sure bout it tho.
Author:  danidad [ Tue Nov 23, 2004 1:15 pm ]
Post subject: 
any particular reason it wont work? it appears physicly similar water jacket holes slightly different.. with the smaller cylinder size wouldnt it be easy to take a bit of shoulder of the chamber? then plane... the valves seem back enough to avoid a collision.
am i missing something important??
Author:  czerial [ Tue Nov 23, 2004 2:18 pm ]
Post subject: 
Quote:
Not all 12Y/TA/H blocks came with Cooper S rods only some. My does not have them but a Mate of mine got a 12YD/TA/H block and it had Cooper S Rods so it is possible that the D means a different style of internals.

Not to sure bout it tho.


interesting, always wondered if there was a difference??
Author:  bnicho [ Tue Nov 23, 2004 3:27 pm ]
Post subject: 
danidad wrote:
any particular reason it wont work? it appears physicly similar water jacket holes slightly different.. with the smaller cylinder size wouldnt it be easy to take a bit of shoulder of the chamber? then plane... the valves seem back enough to avoid a collision.
am i missing something important??


Bore spacing is different, chamber volume is wrong and valves and ports are much smaller - basically you will lose a considerable amount of performance. You could probably make it work, but why bother going to all that effort? Get a s/h 12G940. :wink:
Author:  drmini in aust [ Tue Nov 23, 2004 4:43 pm ]
Post subject: 
The 1275 head gasket (which must be used due to bore size) will not cover the big water hole below the thermostat on a small bore head, so even if you bolt it on it will leak.

re the 1275 engine #- my car has a 12YD/Ta/H motor, it had a small journal EN16 crank and S rods in it. (Got an S crank & rods in it now.. :P )
The ones with good cranks don't have S rods.. they have bigger (1.75") journals with the heavy 1100S rods. OK for a road motor, but for racing I'd get some A+ rods which are stronger and lighter. :wink:

<edit> you can lighten the 1100S rods, but using A+ ones saves you the aggro. 8)
Author:  Morris 1100 [ Tue Nov 23, 2004 6:36 pm ]
Post subject: 
From the Morris 1100 workshop manual.

Engine Type Code
12 = Capacity of the engine
Y = Australian Manufacture
D = Variation to power unit 'D' = 4.1 final drive
Ta = Std. ratio remote centre change
H = High compression

From the Morris 1100 parts book
The change point for the conrods was between 12YD/Ta/H - 10487 and 12YD/Ta/H - 10488. So if it was built before the first number it has the cooper s rods (AEG520) and if it was built after the second number it will have 12G1506 rods.
Author:  danidad [ Wed Nov 24, 2004 12:20 am ]
Post subject: 
thanks people much appreciated
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