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 Post subject: Porting 12g940 Head
PostPosted: Thu Jun 06, 2019 4:27 pm 
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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




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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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


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 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Jun 23, 2019 10:57 am 
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Can anyone chime in whether its worth getting rid of those seat cuts in the chamber?


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Jun 23, 2019 1:10 pm 
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SooperDooperMiniCooper ExpertEngineering
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Location: Under the bonnet son!
Its pretty easy work, and has been performed on mini heads since moses was a child. Why not!

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 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 4:46 pm 
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ImageImage
Just finished the rough in .
Putting the inserts in next
Then will blend the chambers


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 6:04 pm 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 641
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

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 Post subject: Re: Porting 12g940 Head
PostPosted: Mon Jun 24, 2019 7:01 pm 
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Exceptional offer Graham thank you !
I will PM you details


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Tue Jun 25, 2019 8:46 pm 
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Just seeing if i can get the chamber heights all identical


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 7:16 pm 
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Oh dear, worry, worry...

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

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 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 8:25 pm 
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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 ?


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Wed Jun 26, 2019 8:49 pm 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 641
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

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 Post subject: Re: Porting 12g940 Head
PostPosted: Thu Jun 27, 2019 2:56 pm 
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ImageImageImage
I love these things ! Thanks graham


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: Porting 12g940 Head
PostPosted: Tue Jul 23, 2019 12:13 pm 
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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

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 Post subject: Re: Porting 12g940 Head
PostPosted: Sun Aug 04, 2019 1:41 am 
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Location: Brisbane QLD
Image

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


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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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