fitting a 12g295 head
Abu Bakar Hj Ashari
that fitting said head may increase power to 6bhp. where can i source such a
head from? and what other mods do i need to do in order to for this to work?
regards
Matt Cullum
these heads are now quite rare and sought after, since they were fitted
to very few cars and seem to go for 100 pounds plus. For fitting to
a stock 998 motor it would need decking (i:e material removing from the
face of the head) as other wise the compression ration would be all
wrong, this however wouldn't cost you much (20-30quid). Dunno
where you would get one nowadays, most people i know who have one
are sitting on them waiting for the right price.
I'ld only bother fitting one after a stage one kit.
Regards
Matt
EricR
specialists, and you can get them for a lot cheaper. Trust me, that's
where ours came from.
EricR
--
***SPAM TRAP*** Change twentyone to 21 to reply.
Team RO&CH Rallying - www.eric.btinternet.co.uk/rally/
Matt Cullum
Ah yes I remember you mentioning that Eric, stupid me. Well worth
checking out,all my old mini bits n bobs are now finding there way onto
my mini minus! Not far
of starting it now!
Matt
Barspeed@bigfoot
pistons arent concave/vex?? like on the old 1000 block?
jono
"Abu Bakar Hj Ashari" <ab...@ukc.ac.uk> wrote in message
news:a1b28a$298$1...@athena.ukc.ac.uk...
---
Outgoing mail is certified Virus Free. It has been checked for any Badies
and nasty infections so theres no need to worry!
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.303 / Virus Database: 164 - Release Date: 11/24/01
David Quinn
news:3C39633D...@totalise.co.uk...
I've had one sitting in my airing cupboard for two years while I get round
to getting another Mini. I'm keeping it, but look here :
http://www.mgcars.org.uk/class/EuropePFS.html and search for 12G295. There's
some advertised for a piffling 40 UKP.
Dave
JuGhea6
Barspeed@bigfoot
Mini 1000. that had concave pistons tops. I was told that the valves would
come into contact with the picton and bend everything up but they didnt, I
ran it fine until the gearbox couldnt cope with the S head and twin carbs.
jono
"JuGhea6" <ab...@ukc.ac.uk> wrote in message
news:a1deql$e1j$1...@athena.ukc.ac.uk...
> so i can fit a 12g295 head to my 1979 1000cc block?
>
>
Kelley Mascher
And don't forget all those hot Austin 1100s that came out of the
factory. ;^) All but the earliest Austin/Morris/MG 1100 models had
12G295 heads. I would think they would be as common as dirt in the
U.K. They're easily found in the U.S. but few people are interested in
running 998s here.
Cheers,
Kelley
On Wed, 09 Jan 2002 01:19:08 +1100, Graham <zeb...@alphalink.com.au>
wrote:
>"Barspeed@bigfoot" wrote:
>> Thats what i am not completly sure on. I fitted a Cooper S head to my
>> 1972 Mini 1000. that had concave pistons tops. I was told that the
>> valves would come into contact with the picton and bend everything up
>> but they didnt, I ran it fine until the gearbox couldnt cope with the
>> S head and twin carbs.
>
>
>As I understand it, without looking it up, the 12G295 is the head fitted
>to the hotter versions of the small bore motors in things like Spridgets
>(1098cc) and Coopers (998cc). It's the "right" best factory standard
>head for small bore motors if you are unfortunate enough to "know" that
>1275 heads aren't suitable.......
>
>Of course, in 1987 dead Morris 1300 autos were worth about Au$70
>(30GBP), so even if you knew the head shouldn't fit, with care, for the
>cost of a head gasket, you could give it a go very cheaply.
Mike
wrote:
>"Barspeed@bigfoot" wrote:
>> Thats what i am not completly sure on. I fitted a Cooper S head to my
>> 1972 Mini 1000. that had concave pistons tops. I was told that the
>> valves would come into contact with the picton and bend everything up
>> but they didnt, I ran it fine until the gearbox couldnt cope with the
>> S head and twin carbs.
>
>The Cooper S is a 1275 motor with a much larger bore and different bore
>spacing.
>
>Sometimes, but not always, when you fit a 1275 head to a 998 or 1098
>small bore motor, the valves foul on the cylinder walls and are unable
>to open.
>
>If they don't touch anything, sometimes the change in combustion chamber
>size results in an excessively low compression ratio.
>
Actually, the large bore heads (12G940 etc) have the smallest
combustion chambers of all the standard heads, so fitting one to a
small bore engine will increase the compression ratio (substantialy in
some cases).
>And sometimes, if you're very lucky, like I was in 1986, the valves
>clear, the compression ratio is fine and the motor goes really well.
>Ignorance can sometimes be bliss.......
>
>As I understand it, without looking it up, the 12G295 is the head fitted
>to the hotter versions of the small bore motors in things like Spridgets
>(1098cc) and Coopers (998cc). It's the "right" best factory standard
>head for small bore motors if you are unfortunate enough to "know" that
>1275 heads aren't suitable.......
1275 Heads are a cheap option, but they don't give optimum results on
small bore engines due to overly large port sizes and the shrouding
that the cylinder gives to the valves.
Mike
Allan
"Abu Bakar Hj Ashari" <ab...@ukc.ac.uk> wrote in message
news:a1b28a$298$1...@athena.ukc.ac.uk...
One litre coopers had Domed pistons, and large chambers. To make a '295
work best (on a standard 998) I am led to believe that you must increase the
compression ratio, and fit a 1 3/4" SU (or equivalent). Plus the usual
bits, exhaust etc. If you want 60hp at the wheels look at doing the cam
too. It is all in Mr Vizards Bible, Tuning the A-series.
This head will bolt onto A+ or 1100's just the same.
They were fitted to Riley Kestrels, MG1100's and some say wolsely 1100's.
All of these are now as rare as coopers, but if you see an old 1100 in a
scrappy have a look.