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12G295 Head
Posted: Thu Oct 01, 2009 3:24 am
by hamford14
Hi,
I am thinking of fitting a 12G295 head to a 948cc motor and was wondering if that is a straight fit or not? I thought I heard that the head had to be skimmed but I'm not sure.
Any help would be much appreciated,
Thanks Todd
Posted: Thu Oct 01, 2009 7:52 am
by Peetee
Yes it is a straight fit and yes it does need skimming to bring the compression back to comparable. I had 60thou taken off mine and it went like a train! It makes for a very nice engine. My 1275 might be faster but it's no where near as smooth.
Posted: Thu Oct 01, 2009 10:44 am
by bmcecosse
I would say 80 thou will make the compression nearer the mark. But to get best benefit you will also need a larger carb - and look for the MG Metro alloy inlet manifold - that's where the greatest power gain lies !
Posted: Thu Oct 01, 2009 4:15 pm
by Peetee
As ever, check it hasn't been skimmed already. Memory fails me but someone will come along and tell you the depth of the block so you can check.
Posted: Thu Oct 01, 2009 6:39 pm
by bmcecosse
All heads (not block!) start out at 3.750" thick. Anything less means it has been skimmed - and by how much.
Posted: Thu Oct 01, 2009 10:09 pm
by les
I think that should be 2.750'' thick!
Posted: Thu Oct 01, 2009 10:10 pm
by bmcecosse
Sorry - yes -2.750 " slip of the mind!
Posted: Thu Oct 01, 2009 11:58 pm
by Peetee
With a 1" skim you could probably run it on diesel.
Posted: Fri Oct 02, 2009 3:09 am
by hamford14
Just checked and it hasn't been skimmed,
Thanks for the help,
Todd
Posted: Fri Oct 02, 2009 3:07 pm
by bmcecosse
Good! Have 80 thou off it - and be sure to take the sharp edges off the rim of the combustion chambers - see another thread where the car has 'running on' problems.