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| Identify this please.. https://www.ausmini.com/forums/viewtopic.php?f=2&t=18282 |
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| Author: | leyland brother [ Tue Apr 18, 2006 10:37 am ] |
| Post subject: | Identify this please.. |
12YDTAH10766 This number would identify the block, but did they come factory with the big valve heads??? Thanks. |
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| Author: | Mike_Byron [ Tue Apr 18, 2006 10:49 am ] |
| Post subject: | |
They came with a 12G940 head which has an unshouded combustion chamber and relatively large valves and ports as compared to earlier small bore heads such as the 12G202 heads. |
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| Author: | leyland brother [ Tue Apr 18, 2006 12:57 pm ] |
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So basically, that motor worked to 1310cc with that head should go pretty good??? |
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| Author: | Mike_Byron [ Tue Apr 18, 2006 1:06 pm ] |
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Short answer - yes Its what I have on my 1310 mini and it goes fine. My motor has a MG metro cam, HIF44 carby, extractors and it will go faster than i want to drive it. Of course the head can be improved considerably by a good gas flow professional but they were pretty good heads straight out of the factory. They breath well compared to the relatively inefficient heads on earlier small bore motors |
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| Author: | drmini in aust [ Tue Apr 18, 2006 8:00 pm ] |
| Post subject: | |
The 1100S head is basically the same casting as a Mk2 Cooper S head, except the inlet valves are 1/16" smaller and it has single valve springs not double. Very easy to fit S inlets, these days it's a common way to make up for worn valve seats. If exhaust seats are worn, fitting unleaded inserts is a good remedy. 
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