i didn't realize there were different prechambers - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• i didn't realize there were different prechambers by RabbitJockey on 17 Jun, 2009 21:57
• here is a thread i found, i wanted to see a cut away of our heads because i was thinking that maybe getting rid of the glow plugs in place of just of a plug would possibly be an easy way of lowering compression, and just using a dodge or ford diesel heater coil in place of the glow plugs.  but then i saw the pictures below which shows the solid lifter 1.6na and hydro lifter 1.6td as having different prechambers, i didn't know this.
  
  
  http://www.eng-tips.com/viewthread.cfm?qid=151792&page=40
  
  
  
• #1 by rabbid79 on 17 Jun, 2009 23:19
• I calculated the compression ratio drop of removing the glow plugs once, but it only came out to about a 0.5 drop in the ratio.  I should probably calculate it again, just to be sure.  I do like the idea of the heater coil in the intake manifold though.
• #2 by arb on 18 Jun, 2009 05:28
• Quote from: rabbid79 on 17 Jun, 2009 23:19

  I calculated the compression ratio drop of removing the glow plugs once, but it only came out to about a 0.5 drop in the ratio.  I should probably calculate it again, just to be sure.  I do like the idea of the heater coil in the intake manifold though.
  

  
  The toaster, as the Ford mechanics call them, are a good idea. But I think it gets cold enough in York that you would have problems starting with only the toaster. The 2.0L Ford Escort diesel (my first new car ;-) had both GP and the toaster.
• #3 by lord_verminaard on 18 Jun, 2009 06:58
• Don't most Cummins engines have just the toaster?
  
  Brendan
• #4 by RabbitJockey on 18 Jun, 2009 13:50
• half a point is a pretty big gain imo, and if you used a plug that was hollowed out or one that didn't go in the entire way, you could probably gain an entire point or more.  regardless i was just surprised to see the difference in prechambers, i thought 1.6's were all the same.  is the difference between turbo and non turbo, or between hydraulic and solid lifter?
• #5 by Dean Erickson on 18 Jun, 2009 17:34
• Just thought I would add the 1.5 head has the same size pre chamber as the 1.6 TD. I had bad cracks in my 1.6 TD head. I had an old 1.5 head that had the same size so I knocked them out and used them in the TD head.
  Dean
• #6 by lord_verminaard on 22 Jun, 2009 07:09
• Quote from: libbybapa on 18 Jun, 2009 07:14

  DI engines have a waaaaayyyyy easier time starting cold due to the reduced heat losses to increased surface area of the pre-chamber. 
  

  
  Doh, forgot about that little detail. 
  
  Brendan