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| Home > Help Needed / General Tech Chat > Cylinder Head Dilema | |||||||
 536 Posts Member #: 5449 Post Whore Melton Mowbray |
12th Dec, 2011 at 12:22:42am
Hi all,
On 25th Sep, 2009 mini13 said:
cool, i'll pop over with my tool and some lube, lol 1293 88.8hp 82.2ftlb 17.3 1/4 @ 78 mph Naturally Aspirated (for now) |
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 2057 Posts Member #: 9252 Post Whore Cleethorpes |
12th Dec, 2011 at 06:08:16am
should be ok to change the guides Done now needs redoing lol |
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432 Posts Member #: 7856 Senior Member Essex |
12th Dec, 2011 at 06:48:33am
Yes, they had double valve springs as well |
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3006 Posts Member #: 2500 Post Whore Buckinghamshire |
12th Dec, 2011 at 09:21:23am
But do remember that if it is a turbo head the exhaust guides will be a different internal diameter to accommodate the thicker(sodium filled) exhaust valves. |
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536 Posts Member #: 5449 Post Whore Melton Mowbray |
12th Dec, 2011 at 09:22:36am
Ok that's great thanks. Which guides do people recommend please? Looking on mini spares there are a few different types? The head will we used on a pocketed 998 which eventually will be force inducted :)
On 25th Sep, 2009 mini13 said:
cool, i'll pop over with my tool and some lube, lol 1293 88.8hp 82.2ftlb 17.3 1/4 @ 78 mph Naturally Aspirated (for now) |
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536 Posts Member #: 5449 Post Whore Melton Mowbray |
12th Dec, 2011 at 09:24:11am
You must have posted while I was, that answers my question thank you! On 25th Sep, 2009 mini13 said:
cool, i'll pop over with my tool and some lube, lol 1293 88.8hp 82.2ftlb 17.3 1/4 @ 78 mph Naturally Aspirated (for now) |
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 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
12th Dec, 2011 at 12:35:28pm
If changing valve guides you WILL HAVE TO regrind the valve seats. 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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 1105 Posts Member #: 1504 Post Whore Westbury, Wiltshire |
12th Dec, 2011 at 03:02:06pm
On 12th Dec, 2011 Vegard said:
If changing valve guides you WILL HAVE TO regrind the valve seats. And ream the new guides out otherwise they'll probably pinch the valves. Minivanless, but reluctantly happy living with the decision. There'll be another one day.
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 8604 Posts Member #: 573 Formerly Axel Podland |
12th Dec, 2011 at 03:03:57pm
And you will need to open out the chambers to 28cc for use on a 998, assuming the pistons are flat topped. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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536 Posts Member #: 5449 Post Whore Melton Mowbray |
12th Dec, 2011 at 06:11:18pm
Thanks for all the info...
On 25th Sep, 2009 mini13 said:
cool, i'll pop over with my tool and some lube, lol 1293 88.8hp 82.2ftlb 17.3 1/4 @ 78 mph Naturally Aspirated (for now) |
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8604 Posts Member #: 573 Formerly Axel Podland |
12th Dec, 2011 at 07:37:10pm
28cc and flat topped pistond will give you 9:1 ish which is ideal for turbo but a bit low for na. Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
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536 Posts Member #: 5449 Post Whore Melton Mowbray |
12th Dec, 2011 at 11:00:29pm
Thanks Paul, may stick a set of pistons in it then :) On 25th Sep, 2009 mini13 said:
cool, i'll pop over with my tool and some lube, lol 1293 88.8hp 82.2ftlb 17.3 1/4 @ 78 mph Naturally Aspirated (for now) |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
12th Dec, 2011 at 11:05:18pm
On 12th Dec, 2011 1293 sprite said:
Vegard by that do you mean regrind the valves in by hand, or get them re cut? You need to recut the valve seats in the head. 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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 1137 Posts Member #: 1450 Post Whore Near Paris - France |
13th Dec, 2011 at 08:07:43pm
On 12th Dec, 2011 Vegard said:
On 12th Dec, 2011 1293 sprite said:
Vegard by that do you mean regrind the valves in by hand, or get them re cut? You need to recut the valve seats in the head. It's best to have them reground by a professional machine shop if I recall correctly what Vegard once told me ... Rusty by nature
On 23rd Jun, 2008 paul wiginton said:
They said "That sounds rough mate." I said "Cheers it cost me a fortune to make it sound like that!" |
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7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
13th Dec, 2011 at 08:26:22pm
On 13th Dec, 2011 Advantage said:
On 12th Dec, 2011 Vegard said:
On 12th Dec, 2011 1293 sprite said:
Vegard by that do you mean regrind the valves in by hand, or get them re cut? You need to recut the valve seats in the head. It's best to have them reground by a professional machine shop if I recall correctly what Vegard once told me ... Indeed. There's no way you can do this at home properly with cheap tools. 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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