Precombustion Chambers

[tour de frans]

Good day
I want to replace the precomps on my 4.2 diesel.They are a loose insert in the head and very easy to remove or fit.No enjineering required. The Agents of course where off course.Their first Quote were R9700.00 for 6.I told them,it is madness.I was shocked and phoned them them the next day to tell them they were crazy.They phoned me back a half day later,and said I can have it for R5000.00.I turned them down.I will buy a new head with precoms for R16000 and not pay the R5000.
I can not get them aftermarket,and want to make my own.
I need your Help please.
GERRIT,you might put me on the right way.
How or where can I test the old precoms,for what material they are made of.A spark test or so.By the looks of them,I can cut with a hacksaw on the back of them with ease.One or two strokes leave a mark.The cylinder side or faceing the piston,have a coating.The hacksaw also leave a mark but after a couple off cuts.
The head are a cast iron ,the precoms also look like a cast of some iron.Maybe cast steel ? By the looks of it,I can make it on a lathe,and send for hardening.
What worry me is the growth of the precomp when hot,and for cracks or brake up and damage the enjine/pistons.
The long and the short,am I looking for trouble to make my own?
Your input will be mutch appreciated.
To be honest,if the agents were cheep,I do not want it.My 4.2 were a non turbo.It has one now and I want to beter the burning on the inside of the enjine.The hole in the precomp must get bigger for better swirl in and out the precomp.
Thanks again
Rdgs
Frans

[Freakazoid]

As far as I can see the TD42 and the TD42T have different precomps. But it seems common on the TD42's to crack the precomps.

Have you tried getting it from Oz?

[tour de frans]

Yes the td42 and td42t are diffirent,But they are all expencive.I have not tried over the water,Had very good luck yesterday at Masterparts.I walked in by them and ask them if I can go through their parts myself.I found the same precomps to fit the td42 head with bigger holes.
Exactly wat I wanted to modify the 4.2 head.The price R700.00 for the lot.
Soon my mod will start on my 4.2 precoms,cut cam,gasflow head,and so on.That is only when Pieter's car is running.

[Pieter du Toit]

Lyk my Frans raak nou al bang my kar gaan syne "out perform" - en my kar loop nog nie eers nie!!! Nou soek hy nou al parte om syne te improve!!

Net n grap Frans - ek dink jy (jou kar) sal nog gatskop teen myne - jy het darem n "self turbo'ed" engine wat meer krag maak as myne!!

Groete

[JG Shields]

Pieter, jou voertuig gaan GATSKOP. Sorry Fans, geen verwysing na jou pragtige voertuig nie.

Die 4.2TD enjin met die 3.0Di se diffs gaan 'n formidabele kombinasie wees. Die kraglewering gaan beduidend daardeur beinvloed word. Merk my woorde. Jy sal jou speedo moet laat kalibreer. (Onthou sommer die naam VR2 Instruments daarvoor) Jou projek gaan nog in die anale afgaan as een van die baanbreker omskakelings wat aan die 3.0Di voertuie nuwe lewe gaan gee. Een van die dae gaan ons almal ons oge begin oop hou vir 3.0Di Patrols van ontplof het en teen goedkoop pryse beskakbaar gaan wees....want hulle sal 4.2TD enjins kan kry.

Terloops, gaan jy die ZD30 enjin se intercooler daar inbou?

[Pieter du Toit]

JG,

Yesliaak jong jy laat my regtig sommer bree bors voel oor my kar - en die engine het nog nie eers geswaai nie!! Ek moet se ek is verskriklik angstig en opgewonde - ek kan nie wag vir die dag wat my kar weer gaan begin loop nie. En ek doen nou regtig ekstra moeite met die engine en ratkas - teen baie ekstra geld ook - so ek vertrou ek gaan baie baie duisende moeilikheid vrye km's he!!

Ek is baie bly jy is so positief oor die diff ratios met die 4.2 engine - want ek moet eerlik se dit pla my nogal of dit alles mooi gaan saam werk. Maar jy klink so seker van jou saak ek voel sommer al klaar beter!!

En ja - verseker gaan my 3.0L se intercooler op daardie 4.2 ingebou word - daar is nie twyfel daaroor nie. Soos ek verstaan is die nuwe 4.2Turbo patrol bakkies almal intercooled - so dit kan net voordelig wees. Dit gaan bietjie dinkwerk aan Frans se kant beteken - maar hy sal weet wat om te doen.

Groete