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| 1275 Chamber issue https://ausmini.com/forums/viewtopic.php?f=2&t=100621 |
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| Author: | Frog Johnson [ Thu Dec 17, 2020 8:24 pm ] |
| Post subject: | 1275 Chamber issue |
Hi everyone, I picked up a head that had a gouge in the chamber, that ran slightly into the valve seat. It looked like an angle grinder or something had hit it. I ground it down to get rid of it, but to a depth that left only a smidge of the original seat. Could it be used if new seats were cut? I know it would pose problems with rocker geometry etc, but I figured if I use shims under the rocker posts and Cooper S valves, maybe??? |
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| Author: | drmini in aust [ Thu Dec 17, 2020 8:48 pm ] |
| Post subject: | Re: 1275 Chamber issue |
Just recut the seats. Or fit unleaded inserts. |
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| Author: | Frog Johnson [ Thu Dec 17, 2020 9:29 pm ] |
| Post subject: | Re: 1275 Chamber issue |
Thanks Doc, that’s good to hear. Do you think the rocker angles etc will be workable? |
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| Author: | drmini in aust [ Fri Dec 18, 2020 4:12 pm ] |
| Post subject: | Re: 1275 Chamber issue |
What is the casting number on the head, near the rocker posts? |
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| Author: | Frog Johnson [ Fri Dec 18, 2020 4:20 pm ] |
| Post subject: | Re: 1275 Chamber issue |
It’s a 12G940. (12938 or something near the thermostat) |
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| Author: | drmini in aust [ Fri Dec 18, 2020 5:36 pm ] |
| Post subject: | Re: 1275 Chamber issue |
OK. It's a Morris 1100S or 1300 auto head. Just recut the seats, or get unleaded exhaust inserts fitted. Use standard 1100S valves or MK 2 S inlets if you prefer. Shims are available to pack up the rockers if needed (usually not with a modified cam), also to pack up the springs to optimise assembled height. |
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