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Engine Specific Info and Questions => IDI Engine => Topic started by: the4ork on July 06, 2008, 10:24:03 pm

Title: O-ringed head/block?
Post by: the4ork on July 06, 2008, 10:24:03 pm

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?

Title: O-ringed head/block?
Post by: blkboostedtruck on July 07, 2008, 03:44:13 am

it's been done! i think andy2 did it? do a search it might be under compound set up?
Duane

Title: O-ringed head/block?
Post by: gigaz2 on July 07, 2008, 06:16:17 am

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.

Title: O-ringed head/block?
Post by: the4ork on July 07, 2008, 08:51:44 am

so it sealed no better than a metal gasket with studs i would guess?

Title: O-ringed head/block?
Post by: andy2 on July 07, 2008, 06:10:07 pm

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.

Title: O-ringed head/block?
Post by: andy2 on July 07, 2008, 06:16:32 pm

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.

Title: O-ringed head/block?
Post by: the4ork on July 07, 2008, 11:27:48 pm

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

Title: O-ringed head/block?
Post by: MJF on July 08, 2008, 05:17:24 am

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.

Title: O-ringed head/block?
Post by: andy2 on July 08, 2008, 03:43:16 pm

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.

Title: O-ringed head/block?
Post by: myke_w on July 10, 2008, 12:33:45 pm

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  :D