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| piston size https://www.ausmini.com/forums/viewtopic.php?f=2&t=64874 |
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| Author: | crabby [ Fri Aug 06, 2010 4:14 pm ] |
| Post subject: | piston size |
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 |
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| Author: | Panthersteve [ Fri Aug 06, 2010 4:27 pm ] |
| Post subject: | |
Why don't you just measure the bore with a vernier Steve |
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| Author: | GT mowog [ Fri Aug 06, 2010 5:13 pm ] |
| Post subject: | |
Is that #2 in a diamond? It sounds very much it's still on standard size. |
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| Author: | Convertible Mini [ Fri Aug 06, 2010 5:18 pm ] |
| Post subject: | |
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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| Author: | crabby [ Fri Aug 06, 2010 5:25 pm ] |
| Post subject: | PISTON SIZE |
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 . |
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| Author: | drmini in aust [ Fri Aug 06, 2010 6:26 pm ] |
| Post subject: | |
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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| Author: | crabby [ Fri Aug 06, 2010 6:29 pm ] |
| Post subject: | piston size |
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 |
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| Author: | drmini in aust [ Fri Aug 06, 2010 7:04 pm ] |
| Post subject: | Re: piston size |
crabby wrote: 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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