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mmiller6512
 Post subject: Engine Number
PostPosted: Mon Dec 12, 2011 5:33 pm 
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848cc
848cc

Joined: Fri Sep 19, 2008 9:24 pm
Posts: 198
Location: South West Rocks
Hello all.
Could someone tell me what this engine came out of please
12YD/Ta/H55##

Thanks.
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Morris 1100
 Post subject:
PostPosted: Mon Dec 12, 2011 5:36 pm 
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Joined: Wed Jul 21, 2004 10:32 pm
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It came out of a late 1967, early 68 Morris 1100S.
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mmiller6512
 Post subject:
PostPosted: Mon Dec 12, 2011 5:41 pm 
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848cc
848cc

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Location: South West Rocks
Is that good/bad ?
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Morris 1100
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PostPosted: Mon Dec 12, 2011 5:43 pm 
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It is a 1275cc engine. There are no bad ones.
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d1ck0
 Post subject:
PostPosted: Mon Dec 12, 2011 5:46 pm 
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1275cc
1275cc

Joined: Sun Apr 02, 2006 2:38 pm
Posts: 2210
Location: Huon Valley, TAS
mmiller6512 wrote:
Is that good/bad ?


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

Dicko.
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mmiller6512
 Post subject:
PostPosted: Mon Dec 12, 2011 6:02 pm 
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848cc
848cc

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Location: South West Rocks
I brought it from a bloke 20 years ago, short block std bore.
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SuperCooper
 Post subject:
PostPosted: Tue Dec 13, 2011 8:22 pm 
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998cc
998cc
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Joined: Mon Feb 05, 2007 10:53 pm
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Location: NSW
If its an early one it should have small jnl 1275 crank and rods.

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drmini in aust
 Post subject:
PostPosted: Tue Dec 13, 2011 8:45 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
It is (originally) a small journal crank from that engine number, the rods in it are same as Cooper S.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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simon k
 Post subject:
PostPosted: Tue Dec 13, 2011 10:15 pm 
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Location: Wodonga - Vic/NSW border
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
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drmini in aust
 Post subject:
PostPosted: Wed Dec 14, 2011 6:26 am 
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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.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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mmiller6512
 Post subject:
PostPosted: Wed Dec 14, 2011 9:19 am 
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848cc
848cc

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Location: South West Rocks
So it was a good buy for $50.00 yes ?
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Mike_Byron
 Post subject:
PostPosted: Wed Dec 14, 2011 10:20 am 
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1275cc
1275cc
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Joined: Mon Sep 19, 2005 4:57 pm
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Location: Gulgong
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
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drmini in aust
 Post subject:
PostPosted: Wed Dec 14, 2011 8:01 pm 
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Location: near Baulkham Hills, NSW
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:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Mike_Byron
 Post subject:
PostPosted: Wed Dec 14, 2011 8:20 pm 
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1275cc
1275cc
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Location: Gulgong
I am in agreement

Depends a little bit what you want out of it and how long you want it as well.
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The Duckmeister
 Post subject:
PostPosted: Mon Jun 11, 2012 4:06 pm 
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998cc
998cc
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Joined: Sun Jan 23, 2011 9:34 am
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Location: Melbourne - S.E. Subs
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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