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Author cosworth head on the redtop?
Jas
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Registered: 13th Oct 04
Location: Mid Wales
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9th Sep 07 at 14:13   View User's Profile U2U Member Reply With Quote
my mates reckons he has one on his mk3 astra gsi?

yay or nay?
BarnshaW
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Registered: 25th Oct 06
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9th Sep 07 at 14:14   View User's Profile U2U Member Reply With Quote
coscast? or cosworth?
Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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9th Sep 07 at 14:15   View User's Profile U2U Member Reply With Quote
could be a coscast...

my old nova engine from a cav gsi was one..
Jas
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9th Sep 07 at 14:15   View User's Profile U2U Member Reply With Quote
he thinks cosworth

whats coscast?
Jas
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9th Sep 07 at 14:15   View User's Profile U2U Member Reply With Quote
differance between normal and coscast?
Ste L
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9th Sep 07 at 14:15   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Jas
he thinks cosworth

whats coscast?



Heads were either made by Cosworth (Coscast) or Kolben Schmidt (KS).
mattk
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Registered: 27th Feb 06
Location: St. Helens
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9th Sep 07 at 14:16   View User's Profile U2U Member Reply With Quote
Normal heads can become pourous

Coscast ones dont
Jas
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9th Sep 07 at 14:17   View User's Profile U2U Member Reply With Quote
he says its the 160bhp version
Ste L
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9th Sep 07 at 14:17   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by mattk
Normal heads can become pourous

Coscast ones dont


coscast one's can, just not that common
Jas
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9th Sep 07 at 14:17   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by mattk
Normal heads can become pourous

Coscast ones dont
Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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9th Sep 07 at 14:18   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Jas
he says its the 160bhp version



won t be 156bhp(which is what they usually are), if the gsi still has a cat, thats what usually make's the difference in power
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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9th Sep 07 at 14:26   View Garage View User's Profile U2U Member Reply With Quote
cosworth did design a valve in the engine..
Jas
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9th Sep 07 at 14:31   View User's Profile U2U Member Reply With Quote
so whats the power of the coscast ones?
Ste L
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9th Sep 07 at 14:32   View User's Profile U2U Member Reply With Quote
same as a normal c20xe..

150-156 depending if it's got a cat or not
Jas
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9th Sep 07 at 16:15   View User's Profile U2U Member Reply With Quote
lol, whats the point of this other head if there are no gains
Ste L
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9th Sep 07 at 16:17   View User's Profile U2U Member Reply With Quote
it was the original head used on xe's...

then vaux started making the head after that...

hence the change
leekeefy
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9th Sep 07 at 17:01   View User's Profile U2U Member Reply With Quote
i think the coscast head was only on early gte's

iirc the coscast head has no core plug under the dizzy

probably
Ste L
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9th Sep 07 at 17:04   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by leekeefy
i think the coscast head was only on early gte's

iirc the coscast head has no core plug under the dizzy

probably


the very last xe's was also coscast's too
but didn't have the bigger valve guide's like the early one's
leekeefy
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9th Sep 07 at 17:05   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Ste L
quote:
Originally posted by leekeefy
i think the coscast head was only on early gte's

iirc the coscast head has no core plug under the dizzy

probably


the very last xe's was also coscast's too
but didn't have the bigger valve guide's like the early one's


ah,you learn summat new evry day
starkie
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Registered: 1st Jul 03
Location: Leslie, Fife
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9th Sep 07 at 17:29   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
cosworth did design a valve in the engine..



then the head then made it
Nic Barnes
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9th Sep 07 at 17:36   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Jas
lol, whats the point of this other head if there are no gains


the coscast ones do differ slightly in port design allegedly and can flow enough for 230bhp roughly without any modification. the later 20xe's say around 1993, basically those with a por type flywheel had heads that were slightly different inside, to do more with emissions
Mattb
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Registered: 2nd Feb 03
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9th Sep 07 at 18:20   View User's Profile U2U Member Reply With Quote
also Coscast heads do also go 'porus' they are just less prone to it than KS heads
Ste L
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Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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9th Sep 07 at 18:24   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Mattb
also Coscast heads do also go 'porus' they are just less prone to it than KS heads


already said that earlier in the thread
Marc
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Registered: 11th Aug 02
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9th Sep 07 at 18:28   View User's Profile U2U Member Reply With Quote
Coscast has forged pistons etc. Was quite expensive to produce.

I'll await one of the geeks to give you full wank worthy story.
corsa120
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Registered: 4th May 02
Location: Northamptonshire
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9th Sep 07 at 18:30   View User's Profile U2U Member Reply With Quote
mine is a coscast head taken from a 1992 k-reg cav sri

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