zetec turbo
24-01-2008, 09:30 PM
#1
PassionFord Post Whore!!
Thread Starter
zetec turbo
got the bottom end sorted 
now ive got a st170 head what are they good for standard ?? i heard they have bigger valves and bigger ports as standard i want 350/400 bhp 
now ive got a st170 head what are they good for standard ?? i heard they have bigger valves and bigger ports as standard i want 350/400 bhp
24-01-2008, 09:49 PM
#7
crazycage
Auatin W or sas would be the people to speak to mate, have alook at austins resto thread, loads of info there. You have to do something with the VVT on the st head though.
Would have thought you'd be OK for that power with a worked blacktop head though?
Auatin W or sas would be the people to speak to mate, have alook at austins resto thread, loads of info there. You have to do something with the VVT on the st head though.
Would have thought you'd be OK for that power with a worked blacktop head though?
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24-01-2008, 09:50 PM
#8
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Originally Posted by Will @ M Developments
ST head will piss 350bhp mate. 
anyone no if the valve springs need doing or the standard one good
24-01-2008, 09:52 PM
#9
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Would have thought you'd be OK for that power with a worked blacktop head though?[/quote]
i no that but if i can save on the porting as the st170 one has bigger valves and ports then it will save me some cash for a focus rs box
i no that but if i can save on the porting as the st170 one has bigger valves and ports then it will save me some cash for a focus rs box
24-01-2008, 09:56 PM
#12
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Originally Posted by Šhatter Box
yep you cant just put the head of the st on the black top as there is work to be done to make it fit as its vvc 
24-01-2008, 09:56 PM
#13
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Standard ST valve springs are ok as long as you're not chasing crazy revs.
Piper can reprofile the inlet cam and supply new valve springs and retainers if you do want to rev it out more.
To disable the VVT you need to tap the oil feed and put a grub screw in.
You'll also need to turn up an adaptor on a lathe to run a 2.0 Zetec vernier on the end of the inlet cam.
Piper can reprofile the inlet cam and supply new valve springs and retainers if you do want to rev it out more.
To disable the VVT you need to tap the oil feed and put a grub screw in.
You'll also need to turn up an adaptor on a lathe to run a 2.0 Zetec vernier on the end of the inlet cam.
24-01-2008, 09:58 PM
#14
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Originally Posted by Will @ M Developments
Standard ST valve springs are ok as long as you're not chasing crazy revs.
Piper can reprofile the inlet cam and supply new valve springs and retainers if you do want to rev it out more.
To disable the VVT you need to tap the oil feed and put a grub screw in.
You'll also need to turn up an adaptor on a lathe to run a 2.0 Zetec vernier on the end of the inlet cam.
Piper can reprofile the inlet cam and supply new valve springs and retainers if you do want to rev it out more.
To disable the VVT you need to tap the oil feed and put a grub screw in.
You'll also need to turn up an adaptor on a lathe to run a 2.0 Zetec vernier on the end of the inlet cam.
24-01-2008, 10:16 PM
#15
For the VVT or not, just use the standard pully and time it up on the standard marks.
The pully is set at max advance as standard/rest, its only when the car see oil pressure does it retard
Simon.
The pully is set at max advance as standard/rest, its only when the car see oil pressure does it retard
Simon.
26-01-2008, 05:02 PM
#17
Originally Posted by crazycage
so at what point would the head need porting ?? and differant cams??
Head 500+
S.
26-01-2008, 06:16 PM
#18
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Originally Posted by sas
Originally Posted by crazycage
so at what point would the head need porting ?? and differant cams??
Head 500+
S.
on a standard head if so thats just saved me a lot of muney then
28-01-2008, 07:36 PM
#24
Ian Howell told me the ST170 heads flow 400 pretty easily but needs the exhaust ports taken out a bit to go any further? Also mentioned i need a cam (or cams cant remember) and uprated valve springs.
However Iam hoping whats been said here is right - Standard Cams, valve springs and ports all capable of 400 as of standard?
However Iam hoping whats been said here is right - Standard Cams, valve springs and ports all capable of 400 as of standard?
28-01-2008, 08:33 PM
#25
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Originally Posted by XRT_si
Ian Howell told me the ST170 heads flow 400 pretty easily but needs the exhaust ports taken out a bit to go any further? Also mentioned i need a cam (or cams cant remember) and uprated valve springs.
However Iam hoping whats been said here is right - Standard Cams, valve springs and ports all capable of 400 as of standard?
However Iam hoping whats been said here is right - Standard Cams, valve springs and ports all capable of 400 as of standard?
28-01-2008, 09:47 PM
#26
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Standard exhaust cam is good for over 400. The inlet cam can benefit from a reprofile.
Valve springs can do the bigger power - however i personally would uprate them if you're doing high revs at that power.
Valves can do good power but exhaust valves may start to suffer from raised EGTs on top speed runs.
ST170 combustion chamer is 8cc smaller than a Zetec from memory so off the shelf 9.0:1 pistons tend to go over 10.0:1 with an ST head
Valve springs can do the bigger power - however i personally would uprate them if you're doing high revs at that power.
Valves can do good power but exhaust valves may start to suffer from raised EGTs on top speed runs.
ST170 combustion chamer is 8cc smaller than a Zetec from memory so off the shelf 9.0:1 pistons tend to go over 10.0:1 with an ST head
28-01-2008, 11:15 PM
#27
Originally Posted by Will @ M Developments
Standard exhaust cam is good for over 400. The inlet cam can benefit from a reprofile.
Valve springs can do the bigger power - however i personally would uprate them if you're doing high revs at that power.
Valves can do good power but exhaust valves may start to suffer from raised EGTs on top speed runs.
ST170 combustion chamer is 8cc smaller than a Zetec from memory so off the shelf 9.0:1 pistons tend to go over 10.0:1 with an ST head
Valve springs can do the bigger power - however i personally would uprate them if you're doing high revs at that power.
Valves can do good power but exhaust valves may start to suffer from raised EGTs on top speed runs.
ST170 combustion chamer is 8cc smaller than a Zetec from memory so off the shelf 9.0:1 pistons tend to go over 10.0:1 with an ST head
29-01-2008, 11:18 AM
#31
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Haven't seen the flow figures for an american head but in all honesty - they are a completely different entity - not very much at all is interchangable between a zetec head and an ST170 head.
Some people run the valves and valve springs from an ST head in a normal zetec - but even then - machining is needed.
Some people run the valves and valve springs from an ST head in a normal zetec - but even then - machining is needed.
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