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Engine Number
https://www.ausmini.com/forums/viewtopic.php?f=2&t=74602		 Page 1 of 2
Author:  mmiller6512 [ Mon Dec 12, 2011 5:33 pm ]
Post subject:  Engine Number
Hello all.
Could someone tell me what this engine came out of please
12YD/Ta/H55##

Thanks.
Author:  Morris 1100 [ Mon Dec 12, 2011 5:36 pm ]
Post subject: 
It came out of a late 1967, early 68 Morris 1100S.
Author:  mmiller6512 [ Mon Dec 12, 2011 5:41 pm ]
Post subject: 
Is that good/bad ?
Author:  Morris 1100 [ Mon Dec 12, 2011 5:43 pm ]
Post subject: 
It is a 1275cc engine. There are no bad ones.
Author:  d1ck0 [ Mon Dec 12, 2011 5:46 pm ]
Post subject: 
mmiller6512 wrote:
Is that good/bad ?


It's bad. You better give it to me :D

Dicko.
Author:  mmiller6512 [ Mon Dec 12, 2011 6:02 pm ]
Post subject: 
I brought it from a bloke 20 years ago, short block std bore.
Author:  SuperCooper [ Tue Dec 13, 2011 8:22 pm ]
Post subject: 
If its an early one it should have small jnl 1275 crank and rods.
Author:  drmini in aust [ Tue Dec 13, 2011 8:45 pm ]
Post subject: 
It is (originally) a small journal crank from that engine number, the rods in it are same as Cooper S.
Author:  simon k [ Tue Dec 13, 2011 10:15 pm ]
Post subject: 
I thought all of the large journal ones were 12YDTaH, the 12YTaH engines came first, and were small journal, then changed to large after 105??

so this'd be a large journal motor
Author:  drmini in aust [ Wed Dec 14, 2011 6:26 am ]
Post subject: 
simon k wrote:
I thought all of the large journal ones were 12YDTaH, the 12YTaH engines came first, and were small journal, then changed to large after 105??

so this'd be a large journal motor

Nope the change point was 12YD/Ta/H10487-10488.
So it's a small J as as I said.
Author:  mmiller6512 [ Wed Dec 14, 2011 9:19 am ]
Post subject: 
So it was a good buy for $50.00 yes ?
Author:  Mike_Byron [ Wed Dec 14, 2011 10:20 am ]
Post subject: 
Well not if its still in the shed after twenty years given the rise of the value of the dollar at that time :P

But yes its a good reliable motor - and worth the investment. Depends entirely on its condition then and now though. No change out of a grand to recondition it though !!!

Mike
Author:  drmini in aust [ Wed Dec 14, 2011 8:01 pm ]
Post subject: 
Mike_Byron wrote:
Well not if its still in the shed after twenty years given the rise of the value of the dollar at that time :P

But yes its a good reliable motor - and worth the investment. Depends entirely on its condition then and now though. No change out of a grand to recondition it though !!! Mike

And the rest, if doing it properly.
By the time you buy all new valves, guides, springs, fit unleaded exhaust seats and deck the head flat you are past the $500 mark. And you've not even looked at the bottom end. :lol:
Author:  Mike_Byron [ Wed Dec 14, 2011 8:20 pm ]
Post subject: 
I am in agreement

Depends a little bit what you want out of it and how long you want it as well.
Author:  The Duckmeister [ Mon Jun 11, 2012 4:06 pm ]
Post subject: 
BUMP!!!

A little OT from the previous posts (but this fits just as well here as anywhere else).... I've been trawling around a little bit, and just curious about the different numbers for apparently very similar engines.

I'm inspired in this by the 1275s as much as anything (not the least 'cos I have one) - 12YTaH (Morris 1100S), vs 12H902 (1275 LS) vs whatever was in the Cooper S, as well as whatever else is out there. Basically, what are the differences that determine the different engines?
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