Ive been advised to replace my standard valve springs if i am running more than 5 psi boost on my blacktop zetec turbo, Is this correct? If so what valve springs do people recomend and will i need to take the head off to change them? I will be running around 1bar of boost. I should be getting it setup on the rollers in a couple of weeks so if they have to be changed i'd rather do it before.

Any help would be apriciated.

Si

 

Yes you need to change them i think you can get piper ones of ebay 80quid

 

They only need chaging if raising rpm or they are weak anyway.
Being turbo'd does not make the valve any heavier, which is why the spring is there to close it, if it has a significantly higher rpm with the turbo then I would or if done over around 50/60,000 it wouldn't hurt anyway.
tabetha

 

they do need to be changed as rs 5tu said the piper ones are good or you could go for double valve springs from area six but they cost quite a bit

 

Good luck finding valve springs for under Ł130

Piper do replacment ones which retial about Ł130, and Area Six do similar for Ł135.

No need to go double, its over kill.

 

yep as si said

have a look a my restor thread you can see the spec on my engine there

 

area six they are Ł130 for 85lb springs and good for 20psi but the head has to come off to fit them and the standard ones will float at about 11psi,

 

being turbo means that the valve has more pressure on the back of it, acting against the spring.

pipers springs seem to work, but it all depends on how far you want to go with it.

 

Thank you for the replys, Will the head need to come off to replace them?

 

Yes, afraid so mate

 

 

Been looking on the net and ive found some piper springs for Ł155. I have emailed Area 6 for a price. Also found out with the correct tools the springs can be replaced without removing the head

Si

 

Now sorted, Going to go for the ones from area six, Ł136 delivered Also as its a blacktop i will need to replace the groove retainers to triple groove retainers from an early zetec.

Si

 

also got a price from ian and he's willing to send them.... also had an email from newman for double springs... not sure what to go for now....

 

What price were the newman double valve springs? also will the groove retainers need changing?

Si