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439 Posts Member #: 275 Senior Member bonie scotland |
1st Aug, 2004 at 07:14:42pm
sunday morning with hangover start to modify a head, smart coments allowed, also usefull tips. Edited by AlexF2003 on 1st Aug, 2004. |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
1st Aug, 2004 at 07:49:28pm
all looks good to me...
AlexF |
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439 Posts Member #: 275 Senior Member bonie scotland |
1st Aug, 2004 at 08:27:59pm
not measured chambers yet. just rough cut not pollish yet. lost my bronze valve guides, i want 4 stainles steel exhaust valves with large valve faces, i can get valves but all have thin faces |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
1st Aug, 2004 at 10:11:42pm
what do you mean by large faces?
AlexF |
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 969 Posts Member #: 47 Post Whore Not very sunny swanage |
1st Aug, 2004 at 11:10:43pm
should probably start a new thread about this, but hey, has anyone done any definative testing on the best shape of cylinder head? ive heard of people using completly round chambers? i understand the theory when applied to na engines, but i also realise that the rules are slightly diferent with a turbo engine.
And on the 7th day........... God created turbochargers! |
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5795 Posts Member #: 80 AFRacing LTD Newbury, Berks |
2nd Aug, 2004 at 10:13:26am
yes many people have, however they will not share the results!
AlexF |
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Site Admin  8506 Posts Member #: 16 Sold the turbo and seeing what the C20XE can do! Near Lincoln |
2nd Aug, 2004 at 10:20:40am
This is the first area im going to improve once this engine is up and running. got a few spare heads to be going on with. |
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439 Posts Member #: 275 Senior Member bonie scotland |
8th Aug, 2004 at 12:41:32am
alex, were valve face seat size are normal not like race valve were face and seat are thin, i need 4 quality valves |
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Forum Mod 10980 Posts Member #: 17 ***16*** SouthPark, Colorado |
8th Aug, 2004 at 09:03:37am
Alex, do you really believe that back-to-back tests have been carried out on engine dynos with different chamber shapes, but identical porting, CR and valvetrain geometry???
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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 7763 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
17th Jan, 2007 at 01:19:49pm
Well, I for sure don't! :) 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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1641 Posts Member #: 178 Post Whore stowmaket suffolk |
31st Jan, 2007 at 08:58:38am
thats the only way you will know.
always looking for them bigger bunches of bannanas |
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 5329 Posts Member #: 140 Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place |
4th Feb, 2007 at 03:56:55pm
yes it funny how many different shapes there are out there. Best 1/4 mile 13.2 seconds @116 mph
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 6965 Posts Member #: 507 Fastest A Series Mini in the World leeds/wakefield. |
4th Feb, 2007 at 06:59:43pm
On 4th of Feb, 2007 at 03:56pm Miniwilliams said:
yes it funny how many different shapes there are out there. yes Matt,i can testify to that seing as my wife has been most of them over the years,lol |
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715 Posts Member #: 1381 Post Whore Doncaster, South Yorkshire |
4th Feb, 2007 at 07:32:07pm
After that insult you should buy her the new kitchen!!!
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6965 Posts Member #: 507 Fastest A Series Mini in the World leeds/wakefield. |
4th Feb, 2007 at 07:46:53pm
THAT WAS A COMPLIMENT.some of those sizes were most unflattering,lol,
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5329 Posts Member #: 140 Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place |
4th Feb, 2007 at 11:59:05pm
Best 1/4 mile 13.2 seconds @116 mph
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4 Posts Member #: 5871 Junior Member |
24th Apr, 2009 at 11:11:29pm
hello, just wondering what tools you require to attempt this, i am supercharging a 1275 a plus over the summer and am going to need to open up the head a little, also quite fancy having a go at opening up the ports and matching etc but was just wondering whether you need a mill or can it be done with a drill and grinding stone??
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 209 Posts Member #: 6451 Senior Member South East Northumberland |
5th Jul, 2009 at 12:05:11pm
nobby, if you haven't done this already, you can do this using a dremel type tool with a flexi drive, using various sizes/shapes of grinding stones. Be aware it takes some time! I've just had my MPi on the rollers with a home ported head and got 74bhp, so it can be worthwhile! |
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7763 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
5th Jul, 2009 at 09:51:57pm
On 4th Feb, 2007 fastcarl said:
THAT WAS A COMPLIMENT.some of those sizes were most unflattering,lol, THREAD HYJACK, she'll get the kitchen when i'm ready.lol. 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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7763 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
5th Jul, 2009 at 09:51:58pm
On 4th Feb, 2007 fastcarl said:
THAT WAS A COMPLIMENT.some of those sizes were most unflattering,lol, HAHAHAHA, I haven't seen this previously! 
Edited by Vegard on 5th Jul, 2009. 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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3004 Posts Member #: 2500 Post Whore Buckinghamshire |
5th Jul, 2009 at 09:52:20pm
IMHO head modifying, even with the Vizard guide, is not something that an amateur can do well. It is relatively easy to make an improvement on a standard head by just cleaning it up and making a bit more room in some places. I,ve done a lot and the biggest mistake I have made is taking off too much metal - you can always take more off, but its tricky putting it back.
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