O-ringed head/block? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• O-ringed head/block? by the4ork on 06 Jul, 2008 22:24
• has anyone tried it?
  
  is it better to do the block or the head?
  
  im considering trying it, i know a machine shop that can do it at an apetizing price...
  
  i dont want to do the head b/c i want to have the combustion chambers ceramic coated, i'd rather do just the block.
  
  with the metal headgasket
  
  30+ psi here i come
  
  any imput?
• #1 by blkboostedtruck on 07 Jul, 2008 03:44
• it's been done! i think andy2 did it? do a search it might be under compound set up?
  Duane
• #2 by gigaz2 on 07 Jul, 2008 06:16
• hasn't he concluded that the head can't seal with only 4 bolts per cylinder being subjected to those pressures?
  I believe that is in the end of that thread.
• #3 by the4ork on 07 Jul, 2008 08:51
• so it sealed no better than a metal gasket with studs i would guess?
• #4 by andy2 on 07 Jul, 2008 18:10
• The problem is not the factory head bolts or the steel multi layer gasket.The cyl head will actually flex between the headbolts causing combutsion leakage.
• #5 by andy2 on 07 Jul, 2008 18:16
• We would need an iron cyl head and have long studs that go through the head and block right down to the main bearing caps.This will take the stress off the block as the deck of the block would be the next weak link.
• #6 by the4ork on 07 Jul, 2008 23:27
• so at what pressures are we having problems with flex and combustion leakage?
• #7 by MJF on 08 Jul, 2008 05:17
• Quote from: "the4ork"

  so at what pressures are we having problems with flex and combustion leakage?

  
  
  You need high enough cylinder pressures for that, it´s not the boost. I´ve never had any kind of head gasket problems, but I had only 230hp/37psi/24+:1 compression.
• #8 by andy2 on 08 Jul, 2008 15:43
• Its really the High torque/cyl pressures that cause the issue.The longer stroke 1.9L can make much more torque and at lower rpm when compared to the 1.6 this is why the 2 engines have different results when they are modified.
• #9 by myke_w on 10 Jul, 2008 12:33
• Quote from: "MJF"

  . I´ve never had any kind of head gasket problems, but I had only 230hp/37psi/24+:1 compression.

  
  
  I think I found my new signature