1,9 to 2,1 liter - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• 1,9 to 2,1 liter by ISBjornen on 04 Aug, 2007 09:49
• What is the advantage of drilling from the original 1,9 to 2,1 liter?
• #1 by jtanguay on 04 Aug, 2007 12:56
• will the block even support that?  it would be higher displacement, more power, more fuel consumption, and more problems down the road due to change in compression etc.
• #2 by Black Smokin' Diesel on 04 Aug, 2007 13:46
• Quote from: "jtanguay"

  will the block even support that?  it would be higher displacement, more power, more fuel consumption, and more problems down the road due to change in compression etc.

  
  
  I don't think compression will change, well the compression ratio I mean. Quite frankly, I don't think you can bore it to 2.1. The cylinder walls are gonna be way too thin to support any major power. You can't bore a diesel that much like you can on a gasser.
• #3 by Benjamin on 04 Aug, 2007 15:47
• how much space is there with a 1.9 and a 1.6 between 2 cilinders? i mean how tick is the wall. if its smaller, maybe we realy realy do need more better solutions for headgasketproblems
  
  Greetz, Benjamin
• #4 by Slave2School on 04 Aug, 2007 15:51
• I know of a 2.0L down this way that is being built for a rabbit pickup
• #5 by scopefrfd on 04 Aug, 2007 18:14
• using the pistons from an audi 2.5 tdi will yield a 2.0L.  You need 83mm pistons to get 2067cc aka a 2.1L.  That's pretty thin between the cylinders...gassers have taken the block out to 83.5mm
• #6 by jtanguay on 04 Aug, 2007 18:34
• Quote from: "Black Smokin' Diesel"

  Quote from: "jtanguay"

  will the block even support that?  it would be higher displacement, more power, more fuel consumption, and more problems down the road due to change in compression etc.

  
  
  I don't think compression will change, well the compression ratio I mean. Quite frankly, I don't think you can bore it to 2.1. The cylinder walls are gonna be way too thin to support any major power. You can't bore a diesel that much like you can on a gasser.

  
  
  if you can find pistons that are exactly the same as required to have the same compression ratio then i guess you're right, but good luck finding it!  :lol:
• #7 by Black Smokin' Diesel on 04 Aug, 2007 20:16
• Quote from: "libbybapa"

  The compression ratio does indeed go up when overboring due to the fact that the combustion chamber (the 1 part of the ratio) remains the same yet the volume of the cylinder (the bigger number) increases.
  
  Andrew

  
  
  Geez major brain fart... you're right. I was only thinking about piston travel (which doesn't change) but didn't compensate for the added volume :oops:
• #8 by Benjamin on 05 Aug, 2007 01:43
• My Fiat do have 82,6mm pistons, wanna buy a set.  :wink:
  
  Greetz, Benjamin
• #9 by ISBjornen on 11 Aug, 2007 07:48
• how big i the audii 2,5tdi pistons? im thinking about them, im also planing to try a 1z top and block with oil cooling on the pistons. but whit my 12 mekanikal pump. and 2 step injkectors
  
  ideas?
• #10 by Benjamin on 14 Aug, 2007 23:47
• this guy use the 2.5pistons
  http://www.centralvwaudi.com/tdi.htm
  
  i think 2step injectors are good for economical, but i think fot best perfomance you better use 1step.
  
  Greetz, Benjamin
• #11 by stewardc on 15 Aug, 2007 04:09
• My pistons are first oversize and that will give a hair less than 2 liters. I think it will give slightly more torque.
• #12 by ISBjornen on 17 Aug, 2007 00:10
• I will be running 2 step ionjectors, will alos use a 1Z top butt whit the aaz injector pump, maby ill use the 1Z bottom becuse of the oil cooling on the pistons.
• #13 by stewardc on 17 Aug, 2007 02:45
• Quote from: "ISBjornen"

  maby ill use the 1Z bottom becuse of the oil cooling on the pistons.

  
  
  All turbodiesels have oil cooling on the pistons, and if you use a 1Z top, you gotta use a 1Z bottom :wink:
• #14 by ISBjornen on 17 Aug, 2007 11:12
• non of the 4 AAZ enigens i have worked whit have it.