head thickness and ....new info...
09-06-2013, 09:34 AM
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head thickness and ....new info...
is their any particular place that s best to measure on a 4x4 cos cylinder head with the verniers ,or is it just a matter of where they fit on ?
depth wise were they 139.12 from new ?
and whats the minimum thats of use ?
and anywhere else on the head i should examine for defects/problems
sorry for all the questions but im off to look at one
Last edited by james kiely; 10-06-2013 at 08:07 PM .
09-06-2013, 11:32 AM
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bump
09-06-2013, 02:34 PM
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09-06-2013, 04:26 PM
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cheers for that matey ,i did have a search around this morning and never came across this
you can almost tell the thickness of the head from the valve seat to the head surface
10-06-2013, 08:32 AM
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No problem James . Its nice having enough material left to see
10-06-2013, 08:40 AM
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im off to have a look at the head at today mate
,it was a spare head the guy bought 13 year ago and never used so hopefully should be a good one
10-06-2013, 12:05 PM
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Good luck with it ,I take it its 4x4 .
10-06-2013, 03:23 PM
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well i bought it mikeand yes a 4x4 one ,what do you reckon
guess the thickness lol
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Last edited by james kiely; 10-06-2013 at 03:43 PM .
10-06-2013, 06:36 PM
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10-06-2013, 07:06 PM
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Quote:
Originally Posted by
james kiely
well i bought it mikeand yes a 4x4 one ,what do you reckon
guess the thickness lol
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Looks skimmed to death.
Im going for 138.3
Last edited by DixieTheKid; 10-06-2013 at 07:12 PM .
10-06-2013, 08:01 PM
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it measures 138.86,
heres something i found out whilst doing a bit of digging which surprised me
A new std head should be 139.0mm according to Cosworth. However I have used several brand new heads over the years and some have been as low as 138.82mm from the factory BRAND NEW. Most NEW heads are 138.90mm. (I have three brand new heads in the workshop and they all measure 138.90mm.)
the above statement by karl norris
10-06-2013, 10:30 PM
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Nice purchase then and seems to be unskimmed maybe.
10-06-2013, 10:38 PM
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Looks close to the valves to me. Do you measure both sides to ensure its been cut straight?
10-06-2013, 10:54 PM
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their different heads mate ,you will notice from the pic that their is more meat at the exhaust side of the head as this was deemed the weakpoint for gasket failure .
but like i said im no expert
11-06-2013, 07:37 AM
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Quote:
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Nice purchase then and seems to be unskimmed maybe.
i hope so mike
11-06-2013, 10:29 AM
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that seems a very good head imo normally you see them less the a papers width from the valve seats to squish area
11-06-2013, 10:48 AM
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Quote:
Originally Posted by
saph cos rob
that seems a very good head imo normally you see them less the a papers width from the valve seats to squish area
^^^^ +1
11-06-2013, 10:55 AM
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Just had another look between the valve seats is that ok as it does look suspect minor hairline in the picture the more i look .Hopefully its just a blemish in the cast ?
11-06-2013, 11:00 AM
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Quote:
Originally Posted by
opposite lock
Just had another look between the valve seats is that ok as it does look suspect minor hairline in the picture the more i look .Hopefully its just a blemish in the cast ?
Which picture and where do you mean?
Could you circle it and re upload perhaps?
11-06-2013, 02:30 PM
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The last pic chip between the exhaust valve seats, could just be a blemish in the casting hard to tell from a pic really
11-06-2013, 02:52 PM
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At 6 o'clock from the plug between the valves .Im sure its nothing to worry about but it caught my eye Chip.
11-06-2013, 03:15 PM
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Thats way too big to be a hairline crack, just a surface imperfection I would have said.
11-06-2013, 04:12 PM
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Quote:
Originally Posted by
opposite lock
Just had another look between the valve seats is that ok as it does look suspect minor hairline in the picture the more i look .Hopefully its just a blemish in the cast ?
that little blemish is in the casting mike ,as its in the same place on all four cylinders mate
11-06-2013, 04:15 PM
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Quote:
Originally Posted by
Chip
Thats way too big to be a hairline crack, just a surface imperfection I would have said.
spot on chip
what do you make of what karl said ,that was news to me tbh as i always thought new heads were 139.12/139.2
i found it on the turbosport forum
11-06-2013, 05:54 PM
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Quote:
Originally Posted by
james kiely
spot on chip
what do you make of what karl said ,that was news to me tbh as i always thought new heads were 139.12/139.2
i found it on the turbosport forum
Ive not got karls experience of new cossie heads (in fact never even owned ONE let alone many) so I cant comment.
My opinion is that clearance on the valve seats is the key thing.
13-06-2013, 11:23 AM
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As chip said, and ignore the min needing to be 138.68 max as people have run them with less plus you can compensate for it by doing other things to get the comp ratio right
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09-06-2013, 09:34 AM
head thickness and ....new info...
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