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Author todays job was
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:21   View User's Profile U2U Member Reply With Quote

to skim my head check all my valves were sealing and i found a problem with my thermostat wich may have been why my head gasket went in the first place anyway i took a couple of pics.





[Edited on 22-05-2007 by sri power]
TheCam
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Registered: 16th Mar 07
Location: Kirkcaldy
User status: Offline
22nd May 07 at 15:25   View User's Profile U2U Member Reply With Quote

coscast heads are supposed to give 12bhp i heard. do you know if this is true?
Ben G
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Registered: 12th Jan 07
Location: Essex
User status: Offline
22nd May 07 at 15:26   View User's Profile U2U Member Reply With Quote

thermostat will be related to the head gasket going. that's what happened to mine
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:26   View User's Profile U2U Member Reply With Quote

dunno.what you mean 12bhp over the standard 150?
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:27   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Ben G
thermostat will be related to the head gasket going. that's what happened to mine


the rubber gasket had come away inside and was sort of blocking it
TheCam
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Registered: 16th Mar 07
Location: Kirkcaldy
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22nd May 07 at 15:34   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by sri power
dunno.what you mean 12bhp over the standard 150?

Yup.
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:38   View User's Profile U2U Member Reply With Quote

don't know mate.i would'nt have thought so.i have heard they are slightly better on power but i wouldnt have thought that much.this engine was rolling road tested and it produced 151bhp.thats not bad considering its standard.but i dont know how good the rolling road was
BarnshaW
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Registered: 25th Oct 06
User status: Offline
22nd May 07 at 15:45   View User's Profile U2U Member Reply With Quote

the coscast heads are less prone to going porous
Dean_W
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Registered: 13th Dec 05
Location: Downham Market, Norfolk
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22nd May 07 at 15:46   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by BarnshaW
the coscast heads are less prone to going porous


As far as i've read, thats the only advantage.
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:47   View User's Profile U2U Member Reply With Quote

yeh ive heard they are a better head.but someone also said they make slightly more power too
BarnshaW
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Registered: 25th Oct 06
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22nd May 07 at 15:48   View User's Profile U2U Member Reply With Quote

i have never heard they give extra bhp
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 15:49   View User's Profile U2U Member Reply With Quote

apparently they are worth quite a bit more too
johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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22nd May 07 at 15:49   View User's Profile U2U Member Reply With Quote

as said the coscast heads are less prone to going porous, they dont give any power increase at all but they are defiantely worth having.
Ste L
Member

Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
User status: Offline
22nd May 07 at 15:59   View User's Profile U2U Member Reply With Quote

no coscast head dont give any power increases...

only reason alot of people think that is due to that they are fitted to pre-cat 20xe's which have more power due to no cat...

difference's between coscast and gm are :-

different oil galleries, which helps stop them going porus
and 3mm bigger ports iirc
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
22nd May 07 at 16:07   View User's Profile U2U Member Reply With Quote

wouldnt the engine code be 20xe then?mine is a c20xe
Ste L
Member

Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
User status: Offline
22nd May 07 at 16:36   View User's Profile U2U Member Reply With Quote

if its a cos cast, engine code will more than likely be 20xe,
but everyone just call's all of them c20xe's

 
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