Just bought a motor today he stated it was a 1100s motor pulled it apart
came across these no.

head 12g 940

block 12yd/ta

but what i need is the piston size on top of piston are the following mowog across middle on the left side stamped m 2179 and on other side 231 and above mowog there is a no 2 stamped . No need to ckeck crank as they are the same no as i got now so any help with above would be great

THANKS GRAHAME

Why don't you just measure the bore with a vernier

Steve

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1964 998cc Cooper
1971 Mini K x 2
1972 Clubman GT

Is that #2 in a diamond? It sounds very much it's still on standard size.

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I Agree with Gt Mowog here. Also it is definitely a 1275 going by the engine number you gave us. If it has Mowog pistons it is very likely it is still a Virgin. I have never come across a rebuilt engine with original Mowog brand pisons. Any machine shop will measure it for you and tell you what size pistons you will need to get. "If it needs reboring ". Good Find I recon.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

THAT'S WHAT I RECKON ALSO GOOD FIND THER IS NO SLOP IN BORE WITH PISTON IN WHEN I TOOK OUT NO MARKING ON BORE OR NO LIP
HEAD WAS TOLD IS A COOPER S, IT AS 11 STUDS DOUBLE SPRINGS ALSO .

It's not a Cooper S block with that engine number, it's a Morris 1100S. It's easy to drill them for the extra 2 studs (or S 1 stud + 1 bolt)- both mine have been done.

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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.

i no it's only 1100s block but what i like to no the markings on top of pistons and what the head is of thanks

If there are no +020 or +040 etc markings, the bore is still standard 1275 (70.6mm).
The head is `probably' off either a Morris 1100S or a Mk2 S.
Measure the inlet valves- Morris 1100S are 1.3", Cooper S are 1.401".
If it's a Mk2 S head, it `should' have 12G1805 stamped in small letters next to the thermostat housing.

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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.