Jump to content


Photo

Some Qs About Fitting A Thicker Head Gasket Z20Le*

head gasket z20let z20leh cometic

  • Please log in to reply
2 replies to this topic

#1 dedko

dedko

    Newbie

  • 9 posts
  • Gender:Male
  • Location:Harrow, Middlesex

Posted 30 March 2012 - 09:36 AM

What do you guys think about fitting a thicker head gasket which has the effect of reducing compression ratio. e.g. Cometic 5-layer (1.78mm) gaskets.
  • How does fitting a thicker head gasket affect the cam timings now that the belt would be stretched?
  • Can I reuse the belt after I fit the gasket, or should I fit a new one?
  • Can standard stock z20let ECU manage the now lower compression ratio?


#2 siztenboots

siztenboots

    RaceMode

  • 26,622 posts
  • Gender:Not Telling
  • Location:Surrey
  • Interests:french maids

Posted 30 March 2012 - 09:43 AM

best person to ask would be Chip on vauxsport

#3 Nev

Nev

    Nipper's Minion

  • PipPipPipPipPipPipPipPip
  • 11,587 posts
  • Gender:Male
  • Location:Bristol
  • Interests:Rock climbing, skiing, kayaking, surfing, mountaineering, budgies, chess, practical mechanics.

Posted 31 March 2012 - 12:29 PM

What do you guys think about fitting a thicker head gasket which has the effect of reducing compression ratio. e.g. Cometic 5-layer (1.78mm) gaskets.

  • How does fitting a thicker head gasket affect the cam timings now that the belt would be stretched?
  • Can I reuse the belt after I fit the gasket, or should I fit a new one?
  • Can standard stock z20let ECU manage the now lower compression ratio?


1. Belt wont be affected as the adjuster will cope with the extra 0.5mm
2. I'd suggest fitting a new belt as they are cheap and saves you repeating the job. Also inspect and fit a new adjuster if it looks worn or dry (ie not flexing properly).
3. The car would benefit from a RR session and map tweak, but should run ok without I expect. You may find you are down on torque at low revs.

Why are you lowering the compression anyway, are u expecting boost to increase with some mods ?

Edited by Nev, 31 March 2012 - 12:36 PM.






Also tagged with one or more of these keywords: head gasket, z20let, z20leh, cometic

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users