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Maximum skim for 12g940
https://www.ausmini.com/forums/viewtopic.php?f=2&t=69912		 Page 1 of 1
Author:  austinseven [ Sun Apr 03, 2011 6:35 pm ]
Post subject:  Maximum skim for 12g940
How much can you safely skim off the 12g940 before you start running into problems?
Author:  drmini in aust [ Sun Apr 03, 2011 6:39 pm ]
Post subject: 
unlike any smallbore head, a 12G940 can usually take up to ~4mm off.. provided it's not corroded inside.
[edit] I confirmed this figure with Graham Russell a while ago.
Author:  austinseven [ Sun Apr 03, 2011 7:31 pm ]
Post subject: 
Thanks, that is a lot more than I thought.
Author:  GT mowog [ Sun Apr 03, 2011 7:45 pm ]
Post subject: 
Just be careful with the later ones, they have a thinner deck. Check through the small coolant holes near the front of the head.
Author:  gafmo [ Sun Apr 03, 2011 9:51 pm ]
Post subject: 
What Measurement should we be looking for...I have a Few
GT mowog wrote:
they have a thinner deck. Check through the small coolant holes near the front of the head.

and are you meaning the temp sender Hole
Author:  simon k [ Sun Apr 03, 2011 10:16 pm ]
Post subject: 
gafmo wrote:
and are you meaning the temp sender Hole


I think he'd mean the little holes with the brass plug in the head face...
Author:  GT mowog [ Mon Apr 04, 2011 6:19 am ]
Post subject: 
gafmo wrote:
What Measurement should we be looking for...I have a Few
GT mowog wrote:
they have a thinner deck. Check through the small coolant holes near the front of the head.

and are you meaning the temp sender Hole

Simon K wrote:
I think he'd mean the little holes with the brass plug in the head face...


Simon has it here. On the Gasket Face there are 8 small holes on the spark plug side of the head. Check through there. It seemed to be around the time that the MG Metro and MG Turbo was introduced (~83 ish) that this happened. All these heads have the same casting number but I have come across at least 6 or more different versions. I think Phat Kat had a pic up about a year or so ago.
Author:  Phat Kat [ Mon Apr 04, 2011 6:40 pm ]
Post subject: 
Yeah I was just reading this... I was asking the doc what he knew about it (because I couldn't be assed diggin out alll the heads). What I found when I measured them (inc a few different post '83 heads) was that at least with the heads I had at hand, there was no serious difference.

I must point out,,, these were not new heads.

These are some of the heads.


Metro MG

Image

Late model injected head

Image

MK II Cooper S head

Image

Sorry, this one is a bit crappy... but its an MG metro turbo head

Image
.
.
.
.
.

And you know what? :D After digging all the heads out, and taking all the photos.... I just realised, that photographed THE WRONG BLOODY HOLES :oops: :? :lol:
Author:  VulcanBB18 [ Mon Apr 04, 2011 7:19 pm ]
Post subject: 
Phat Kat wrote:
And you know what? :D After digging all the heads out, and taking all the photos.... I just realised, that photographed THE WRONG BLOODY HOLES :oops: :? :lol:


ROFL!! :lol: :lol:

Sorry it reminds me of a mistake I'd make!

Still whats the go with one of the heads there - the exhausts are *bright* white and the adjoining intake valve looks like it suffered too!

cheers

Jacob
Author:  GT mowog [ Mon Apr 04, 2011 7:32 pm ]
Post subject: 
VulcanBB18 wrote:
[ the exhausts are *bright* white
cheers

Jacob


Injection.
Author:  gafmo [ Mon Apr 04, 2011 8:21 pm ]
Post subject: 
I always thought it was measuring from the top face where the Rocker Cover was to the face of the Head and for a Guide was the section in the centre on the back of the head as per this pic

Phat Kat wrote:


Image
Author:  drmini in aust [ Mon Apr 04, 2011 9:02 pm ]
Post subject: 
All A series heads were 2.750" thick (give or take a few thou) top to bottom, if anyone is wondering.... :wink:
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