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Head choice for a hot 1100
https://ausmini.com/forums/viewtopic.php?f=5&t=21898		 Page 1 of 2
Author:  mini-dunger [ Sun Aug 27, 2006 3:12 am ]
Post subject:  Head choice for a hot 1100
hi there, I have come to the engine build stage in my resto and I need to choose a head.
In terms of value for money what should I do ? Buy vizards book and a die grinder and do up my 12g202 (port job,shave,valve grind) or buy a variant of an 1275 head? or any other variant anyone may suggest. I have 2 12g202s and an 1000cc head(smaller valves) somewhere too.
I have no plans to convert it to unleaded fuel as I have no issues with using an additive.
I also do not intend to force induct this engine.

as always your thoughts and opinions will be greatly appreciated.

cheers
Author:  drmini in aust [ Sun Aug 27, 2006 8:50 am ]
Post subject: 
Personally, I would just port the 202 head out, it's a bit of work but worth it. And you will learn a lot doing it..... :wink:
Fit 998 Cooper inlet valves (31mm, 1.219") and open the valve throats to suit.
If the exhaust seats are a bit sunk from high mileage, get some oversize ones (1.062", 27mm) from Karcraft. Or if they're REALLY bad, fit unleaded seats- (costs about $140), and get new 1.000" exhaust valves.

After porting and chamber work, deck the head to get around 9.0-9.5:1 C/R. More if fitting a big cam.
Author:  mini-dunger [ Sun Aug 27, 2006 7:28 pm ]
Post subject:  head
Thanks Doc
I will go and get me a copy of vizards.
Cheers
Author:  MRClubby1098 [ Thu Jan 11, 2007 9:41 pm ]
Post subject: 
go the 12g295 Head they do wonders to the 1098 and also grab your self a sw5 swiftune cam MMMMMMM i can smell the power 8)
Author:  drmini in aust [ Thu Jan 11, 2007 9:46 pm ]
Post subject: 
MRClubby1098 wrote:
go the 12g295 Head they do wonders to the 1098 and also grab your self a sw5 swiftune cam MMMMMMM i can smell the power 8)

Yes the 295 is nice, but getting rarer now. Nothing in a 295 that can't be got from a modified 202 with some grinding. :wink:
Graham Russell prefers the 202 for making race heads, in some places they allow port shape to be improved over a 295.
Author:  TheMiniMan [ Thu Jan 11, 2007 11:40 pm ]
Post subject: 
BMW K1 motorbike twin cam cyl head

:-)
Author:  mini-dunger [ Fri Jan 12, 2007 12:49 am ]
Post subject:  old thread
This is one old thread. I have got a die grinder and a couple 12g202 heads. I just need a carbide sp? burr and I can start hooking into it/them
Author:  Smokie [ Fri Jan 12, 2007 7:54 am ]
Post subject: 
Hey MRClubby1098, how's things in Scone. I used to live there a few years back...
Author:  drmini in aust [ Fri Jan 12, 2007 2:09 pm ]
Post subject:  Re: old thread
mini-dunger wrote:
This is one old thread. I have got a die grinder and a couple 12g202 heads. I just need a carbide sp? burr and I can start hooking into it/them

I'd grab one of Vizard's 2 books if not got already. It has pictures, and dimensions... 8)
Author:  gafmo [ Fri Jan 12, 2007 3:09 pm ]
Post subject: 
I can't read writing only pictures ROFL
Author:  mini-dunger [ Fri Jan 12, 2007 4:13 pm ]
Post subject:  porting
So you dont recommend porting by feel doc?. I was just going to fire up the grinder and follow my heart. :D
Author:  drmini in aust [ Fri Jan 12, 2007 8:10 pm ]
Post subject:  Re: porting
mini-dunger wrote:
So you dont recommend porting by feel doc?. I was just going to fire up the grinder and follow my heart. :D

Well it's pretty hard to make an old 850 head worse, but with a 202 I'd seek some idea of required mods first. If you get carried away and hit fresh water, it's a doorstop. :wink:

As David Vizard once said, speed equipment is only any good if it actually does add SPEED. 8)
Author:  Sir Yun [ Fri Jan 12, 2007 11:26 pm ]
Post subject: 
a write up i did on an other forum of my first effort porting a 202 (done a fair few 12g940 heads). a lot of work ..this head still has to be dyno'd..

http://www.guy-croft.com/viewtopic.php?t=532
Author:  mini-dunger [ Sat Jan 13, 2007 12:01 am ]
Post subject:  thats great
Good post mate. I am not looking forward to it. :o
Author:  drmini in aust [ Sat Jan 13, 2007 6:24 am ]
Post subject: 
A few pics of the last 202 head I did. It went on a 1220 Sprite motor with Imp flat top pistons. 8)
Pics taken before final polishing.
Valve sizes- 33mm inlet, 27mm exhaust.
Image
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