mattywood wrote:
Does anyone know what is the difference between 12G1316 and 12g940 heads?
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| what is the difference between 12G1316 and 12g940 heads? https://ausmini.com/forums/viewtopic.php?f=5&t=31465 |
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| Author: | mattywood [ Sun May 06, 2007 6:56 pm ] |
| Post subject: | what is the difference between 12G1316 and 12g940 heads? |
Does anyone know what is the difference between 12G1316 and 12g940 heads? I was reading Kazjims engine build http://www.ausmini.com/forums/viewtopic ... highlight= and noticed that he used a 12G1316 head. Would there be any difference in using this head over a 12G940 if you wanted to produce a turbo 998? |
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| Author: | cush [ Sun May 06, 2007 6:59 pm ] |
| Post subject: | Re: what is the difference between 12G1316 and 12g940 heads? |
mattywood wrote: Does anyone know what is the difference between 12G1316 and 12g940 heads?
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| Author: | drmini in aust [ Sun May 06, 2007 8:21 pm ] |
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I did that head for kazjim's turbo. A 12G1316 head is basically a 12G940 head casting with 4 ports added to inject air into the exhaust ports- part of the emission control system. If not used, screw some 7/16 UNF plugs into block these. Porting of this head otherwise is much the same as a 940, but the 1316 is a bit thicker around the exhaust bosses so you can shape them better than a 940. These heads were used on 1275LS, and the late 1275 Mokes. Yes you can drill them for the S extra stud and bolt at each end. |
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| Author: | mattywood [ Sun May 06, 2007 8:30 pm ] |
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Getting heaps of grunt out of a 998 would be lots of fun. Was the head work costly? |
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| Author: | drmini in aust [ Sun May 06, 2007 8:34 pm ] |
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No. We just tidied it up a bit, fitted unleaded seats and all new valves and springs. They are already big enough for a 998/1098 motor. Main reason we used a 1275 head was head gasket reliability- these heads are much more rigid than a 202 or 295 one, they use a 1275 turbo gasket, and you can add the studs each end if needed. Could have used a 940 just as well, but I had a spare 1316.
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| Author: | mattywood [ Sun May 06, 2007 9:04 pm ] |
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Did you help him with the build or other machining as well? |
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| Author: | gafmo [ Sun May 06, 2007 9:15 pm ] |
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Going by Memory Kaz did some pocketing on the block for the valvue's specilay as it was turbo |
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| Author: | drmini in aust [ Mon May 07, 2007 6:54 am ] |
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mattywood wrote: Did you help him with the build or other machining as well?
No, I just ported the head a bit and decked it clean, James then sent it off for machining and did the engine build. He pocketed the block himself. |
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| Author: | mattywood [ Mon May 07, 2007 8:05 am ] |
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It looked like a very fast 998. It's a pity he had to sell it. I wouldn't mind doing something like that myself to a 998. What do you reckon that engine would cost if you go someone to do it for you? |
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| Author: | drmini in aust [ Mon May 07, 2007 7:57 pm ] |
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mattywood wrote: It looked like a very fast 998. It's a pity he had to sell it. I wouldn't mind doing something like that myself to a 998. What do you reckon that engine would cost if you go someone to do it for you?
Hmmm how long is a piece of string.. I'd PM kazjim, ask him what he spent.
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| Author: | gafmo [ Mon May 07, 2007 8:19 pm ] |
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Twice the Distance from the Centre to one End |
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