Ausmini
It is currently Mon Nov 11, 2024 5:47 am

Board index » Mini Chat » Mini & A/A+ Series Mods

All times are UTC + 10 hours




Post new topic Reply to topic  Page 1 of 1
  [ 14 posts ] 
  Print view Previous topic | Next topic 
Author Message
simonw
 Post subject: Porting 12g940 Head
PostPosted: Thu Jun 06, 2019 4:27 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Just a bit of a photo diary of the porting. I have not done this before and am enjoying the adventure!

Main goals are:

- Get rid of the valve guide hump in both inlet and exhaust ports
- Smooth out the inlet entrance.
- expand the exhaust entrance to roughly coincide with gasket size.
- deburing the ports as best as possible .

I am using a few pictures and GR’s cutaway of a full race head to gauge how deep I can go with the bowl in the inlet valve throat ..probably using the wrong names for all these locations but you can inform me as we go if you like.

Image

Here are some pictures:

Image




Sent from my iPad using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Thu Jun 06, 2019 6:28 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Image


Sent from my iPad using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Jun 23, 2019 10:57 am 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Can anyone chime in whether its worth getting rid of those seat cuts in the chamber?


Sent from my iPad using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
Mick
 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Jun 23, 2019 1:10 pm 
Offline
SooperDooperMiniCooper ExpertEngineering
User avatar

Joined: Fri Apr 29, 2005 9:46 am
Posts: 18874
Location: Under the bonnet son!
Its pretty easy work, and has been performed on mini heads since moses was a child. Why not!

_________________
SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 4:46 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
ImageImage
Just finished the rough in .
Putting the inserts in next
Then will blend the chambers


Sent from my iPhone using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
GR
 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 6:04 pm 
Offline
Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 690
Location: North Rocks
Hi Simonw
That burr is not really the right thing to use for getting under the valve throats, if you would like I can send you a couple of round stones I had made for getting in there, one is 1inch and the other is 3/4ins both have longer shafts on them they work really well for that.
Your doing a good job, we all had to start some where :D if you need any help just give me a call.
Graham Russell

_________________
"It's better to be not informed than ill-informed"
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 7:01 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Exceptional offer Graham thank you !
I will PM you details


Sent from my iPad using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Tue Jun 25, 2019 8:46 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Image

Just seeing if i can get the chamber heights all identical


Sent from my iPad using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
GR
 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 7:16 pm 
Offline
Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 690
Location: North Rocks
Hi Simon
Did you get the stones they were sent over night?
Graham Russell

_________________
"It's better to be not informed than ill-informed"
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 8:25 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Yes thanks GR just picked them up this afternoon .
Really appreciate it !
Now .... how do I use them properly? :)
Are they to get that real bowl shape where the valve guide humps were ?


Sent from my iPhone using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
GR
 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 8:49 pm 
Offline
Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 690
Location: North Rocks
Hi Simon
The big one will do the inlet bowl it will give you a nice shape, remove the guide boss, but where the divider is use the smaller one as the big one is to big
For that.
As I told you don't worry to much about the exhaust it will be fine,do that and then we will talk about the short side.
Graham Russell

_________________
"It's better to be not informed than ill-informed"
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Thu Jun 27, 2019 2:56 pm 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
ImageImageImage
I love these things ! Thanks graham


Sent from my iPhone using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
bluehishouse
 Post subject: Re: Porting 12g940 Head
PostPosted: Tue Jul 23, 2019 12:13 pm 
Offline
848cc
848cc
User avatar

Joined: Sun Jul 31, 2016 8:20 pm
Posts: 413
Location: Newcastle
More pics! I did some after reading the article among other things, im hopeful it will go alright. Fair bit more came off this 202 later. Image

Sent from my SM-G950F using Tapatalk

_________________
http://www.ausmini.com/forums/viewtopic.php?f=3&t=93352

If I'm carrying on like a pork-chop, I'm having a great time.

If I go very quiet there's a very good chance I broke something.
Top
 Profile  
 
simonw
 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Aug 04, 2019 1:41 am 
Offline
998cc
998cc
User avatar

Joined: Wed Jul 08, 2015 3:29 pm
Posts: 857
Location: Brisbane QLD
Image

So head is completed and decked , just need to set up valves and springs now


Sent from my iPhone using Tapatalk

_________________
Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 14 posts ] 

Board index » Mini Chat » Mini & A/A+ Series Mods

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 10 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.