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329 Posts Member #: 3193 Senior Member Torbay, Devon |
29th Oct, 2008 at 12:13:30pm
Hi,
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 1346 Posts Member #: 2340 Post Whore Dublin Ireland |
29th Oct, 2008 at 12:48:46pm
I dont follow what you are up to, do you mean you are going to cnc machine,
On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers. ______________________________________________________ |
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 1424 Posts Member #: 2810 Formally spanner181187 Dublin, Ireland |
29th Oct, 2008 at 01:51:11pm
Fair balls to you for modelling a cyclinder head! Sounds like alot of work but it will be amazing when done On 12th Nov, 2009 Paul S said:
I think Gary OS has taken over my role as the forum smart arse  On 30th Apr, 2010 Rod S said:
Gary's description is best |
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329 Posts Member #: 3193 Senior Member Torbay, Devon |
29th Oct, 2008 at 01:51:26pm
The aim is to machine out the ports, and possibly the chambers and fit larger valves.
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
29th Oct, 2008 at 02:09:29pm
On 29th Oct, 2008 jonb_5 said: How the hell are you going to accuretly machine the chambers on a CNC machine! I imagine a little can be done coming back past the valve seats but how do you intend on shaping the rest?
The aim is to machine out the ports, and possibly the chambers and fit larger valves. What shapes do you have in mind and are you going to flow check it before and after? Own the day
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
29th Oct, 2008 at 02:23:32pm
I've been contemplating this myself. CNC machining chambers would be fantastic. Accurate and fast. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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329 Posts Member #: 3193 Senior Member Torbay, Devon |
29th Oct, 2008 at 02:32:41pm
Im not 100% sure about all of the machining yet, what i want to do is model the head first as standard.
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
29th Oct, 2008 at 02:34:57pm
On 29th Oct, 2008 Vegard said: I am with you on that, but how do you control the shape past the ports and what you can get at back past the valve seats. The rest of the chamber would be guess work. I cant imagine the comlexity of a machine that could get in an accuretly reshape chambers over and over.
I've been contemplating this myself. CNC machining chambers would be fantastic. Accurate and fast. Own the day
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1346 Posts Member #: 2340 Post Whore Dublin Ireland |
29th Oct, 2008 at 02:39:13pm
the only part of the port on an A series 5 port head you can CNC machine is the part just below the valve seat unless you have access to a new form of CNC milling machine that can bend around corners ! On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers. ______________________________________________________ |
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 8604 Posts Member #: 573 Formerly Axel Podland |
29th Oct, 2008 at 02:41:28pm
The americans have been porting with CNC for some years now:
Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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 (2)[/url] by [url=https://www.flickr.com/photos/150672766@N03/]Rod Sugden[/url], on Fli) 5988 Posts Member #: 2024 Formally Retired Rural Suffolk |
29th Oct, 2008 at 02:44:45pm
There are loads of videos on YouTube of this - I'm sure someone posted a load a few months ago ut I can't remember who....
Schrödinger's cat - so which one am I ??? |
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
29th Oct, 2008 at 02:47:27pm
Own the day
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
29th Oct, 2008 at 02:55:10pm
My machinist has got several AFR-heads for sale. They are VERY good. Obviously som ehand porting would improve matters, but it goes to show that CNCing is more than half the way forward. Just to achieve removing the valve bosses would be a huge improvement. That's time consuming and boring work. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
29th Oct, 2008 at 03:18:08pm
On 29th Oct, 2008 Vegard said: The problem I find is knowing your castings as I have found there is a great deal of variety in wall thickness. On the other hand I did read an article in one of the magazines about flow tests on heads with different stages of modification. The conclusion I drew from this and was said in the article was that the MG casting was almost the best head tested, the figures showed that only the fully modified head which included wasted vavle stems and three angle seats out flowed it.
My machinist has got several AFR-heads for sale. They are VERY good. Obviously som ehand porting would improve matters, but it goes to show that CNCing is more than half the way forward. Just to achieve removing the valve bosses would be a huge improvement. That's time consuming and boring work. So if your after a bench mark to work from try getting hold of one of these heads Own the day
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 2500 Posts Member #: 648 Post Whore Northern Ireland (ex AUS) |
29th Oct, 2008 at 04:55:32pm
On 29th Oct, 2008 Mr Joshua said:
You know that your talking about the country that still fits its flag ship road cars with leaf springs and live rear axles. Perhapse, but with a rear this nice you could live with the leafs: 
On 7th Nov, 2008 Nic said:
naeJ m !!!!!!sdrawkcab si gnihtyreve ?droabyekym ot deneppah sah tahw ayhwdd |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
29th Oct, 2008 at 05:15:38pm
On 29th Oct, 2008 Mr Joshua said:
On 29th Oct, 2008 Vegard said: The problem I find is knowing your castings as I have found there is a great deal of variety in wall thickness. On the other hand I did read an article in one of the magazines about flow tests on heads with different stages of modification. The conclusion I drew from this and was said in the article was that the MG casting was almost the best head tested, the figures showed that only the fully modified head which included wasted vavle stems and three angle seats out flowed it.
My machinist has got several AFR-heads for sale. They are VERY good. Obviously som ehand porting would improve matters, but it goes to show that CNCing is more than half the way forward. Just to achieve removing the valve bosses would be a huge improvement. That's time consuming and boring work. So if your after a bench mark to work from try getting hold of one of these heads This is quite frankly not true. The heads are all the same really apart form the valve throat on the MG Metro heads. They are far superior. However if you took a standard Metro head you'd EASILY make this head outperform the MG Metro even with the 33,3inlet valve. Easy. The heads are from the same foundry, just machined differently. If you could program the CNC to finish off the chambers, remove the valve guide bosses, then several hours of porting would be done in minuts. Then it would just be a question of smoothing it all off, blending stuff and valve seats. I'd prefer starting with NON MG Metro heads as you can make the valve seats nicer this way. Ie not worn out. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
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2496 Posts Member #: 1954 Post Whore Luton Bedfordshire |
30th Oct, 2008 at 10:13:41am
Only what I read. Own the day
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