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Engine number
https://ausmini.com/forums/viewtopic.php?f=2&t=809		 Page 1 of 1
Author:  ronniemac [ Wed Jun 09, 2004 12:28 pm ]
Post subject:  Engine number
Can anyone tell me the what this engine is out of ?
Is it a normal 1275 or something more ?
12YDTaH7022.
Author:  Meck [ Wed Jun 09, 2004 12:43 pm ]
Post subject: 
12YD/Ta/H 1275 ? Leyland 1275LS (12" Wheels)
http://www.hotbricks.org.au/files/engine.txt

Cheers
Matt
Author:  bnicho [ Fri Jun 11, 2004 3:05 pm ]
Post subject: 
Leyland 1275 LS start with 12H902.. That hotbricks site is wrong!

This engine number equates to a Morris 1100S

Morris 1100S actually had a 1275 engine from the factory. Even though the name still has 1100 in it.

Some Morris 1100S even have the same small journal crank and rods as a Cooper S! But they still have the solid block with no cam follower covers on the back.
Author:  Meck [ Fri Jun 11, 2004 3:09 pm ]
Post subject: 
Bugger... sorry 'bout that
Author:  drmini in aust [ Fri Jun 11, 2004 7:05 pm ]
Post subject: 
Yep, BNicho is right. Morris 1100S. I run one in my car.

They have a small journal crank, it's cross drilled but is EN16 steel (not EN40B like an S) and use S rods.
I run an S crank in mine. Just had to play about with thrust washer thickness, otherwise it drops straight in.:P
Author:  9YaTaH [ Fri Jun 11, 2004 10:01 pm ]
Post subject:  Not to mention the head!
8) probably also has a 12G940 "big valve" head - take off the rocker cover and check for the cast in number between the rockers..... :P
Author:  drmini in aust [ Fri Jun 11, 2004 10:33 pm ]
Post subject: 
Stock head on 1100S was a 12G940, with 33mm/29mm valves. Some heads had 12G938 stamped next to the thermostat (where most MK2 Ss had 12G1805 stamped).

Basic casting was the same for both, but the Cooper S had 35.6 intake valves.

Mine now has 35.6/31 valves...and BIG ports.. :wink:
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