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Acceptable Valve Spring Gap Before Coil Bind


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4 replies to this topic

#1
jims205s16

jims205s16
  • Drivers
  • 18 posts
Joined: 02 Oct 2007
  • Name:James walker
  • Location:Basildon, Essex
Hello everyone.
I'm in the process of rebuilding a spare head up for my 1.6 GTI.
I have a Catcam 4900342 I intend to fit which is recommended with double valve springs.
Before I go to the expenses of machining the head for these I thought I'd have a measure up with standard springs.
I have 1.8mm left in the spring at full lift before coil bind which I think is enough but I would like confirmation of this and what is a minimum acceptable.
Thanks Jamie.

#2
petert

petert
  • Pitcrew
  • 5,579 posts
Joined: 15 Nov 2003
  • Name:Peter Taylor
  • Location:Sydney, Australia

Needs to have 0.007" minimum between each coil.



#3
jims205s16

jims205s16
  • Drivers
  • 18 posts
Joined: 02 Oct 2007
  • Name:James walker
  • Location:Basildon, Essex
Thank you for quick response. That sounds like I have enough in the spring then which could be a good saving right there.
Would you know what rpm standard springs ect can cope with. I'm Looking to go to approx 7500.

#4
petert

petert
  • Pitcrew
  • 5,579 posts
Joined: 15 Nov 2003
  • Name:Peter Taylor
  • Location:Sydney, Australia

You won't have any trouble revving past 7500 with those springs, provided the rest of package matches.



#5
jims205s16

jims205s16
  • Drivers
  • 18 posts
Joined: 02 Oct 2007
  • Name:James walker
  • Location:Basildon, Essex
That's good news then. Thanks for confirming.