1.6TD vs 1.9TD rpm's? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• 1.6TD vs 1.9TD rpm's? by Laurentian on 20 Jan, 2006 15:59
• Finally getting on track with my 1.9TD,
  Wingman will be taking care of me.
  I have seen numerous comments here about 1.9's not
  being rev happy like the 1.6's.
  However on my local Quebec site ( VWQebec ) I have not
  come across this comment.
  What's the situation on this, please set me straight!
  Hope I have chosen the right motor, have big plans for it!
  Thanks in advance,
  Hugh
• #1 by 935racer on 20 Jan, 2006 17:28
• The 1.9's do not like to rev like the 1.6's do. I can verify this as I have modified a bunch of both. There are several reasons the 1.9 doesn not rev:
  1: crank is 2lbs heavier than the 1.6 crank, and that 2 lbs is on the very end of the counterweights so the reciprocating mass is signifigantly more.
  2: The rod caps weigh double of what the 1.6 ones weigh.
  3: The 1.9 crank has a longer stroke than the 1.6 crank.
  4: The 1.9 flywheel is heavier.
  5: The tiny turbo on the 1.9 runs out of breath really quick.
  6: The 1.9 lda boost pin has little taper and thus creates very little additional fuel when compared to a 1.6 version.
  
  There are other things too that I am forgetting.
• #2 by Cheesetoast on 20 Jan, 2006 19:30
• all of those things sound like they can be changed/upgraded on the 1.9, if you were to lighten the 1.9 internals, how much power do you think there is to be gained and what would the costs be?
• #3 by Laurentian on 21 Jan, 2006 06:32
• Thanks for the clear reply!
  I have a K-24 that I will be rebuilding soon with the intention
  of installing on the 1.9TD.
  I was also planning on some Smog GTD injectors and pump mods.
  935Racer I also see you have a high perforomance cam advertised on your PassengerPerf. website.
  Would this be worthwhile combined with a big downpipe plus
  the other mods I mentioned?
  I will not be playing around with the core other than the TDI
  pully mod, heavy duty head studs and a better clutch.
  Thanks for the help!
  Hugh
• #4 by 935racer on 22 Jan, 2006 13:36
• I don't think there is too much to be gained from lightening the bottom end of the 1.9 until someone can solve the high rpm fueling issue. I can't get a diesel to smoke after I flow a head, which is nice as far as no smoke go's but lame as far as I know if I could get more fuel there would be soo much more power.
• #5 by Laurentian on 29 Jan, 2006 07:01
• What could I expect performance wise with the following mods I intend to do before the swap?
  
  Gilles performance pump rebuild
  Smog's injectors
  Large downpipe / exhaust with K24 turbo
  Passenger perormance ported head
  Intercooler
  ( and of course better clutch, head studs, TDI crank pully mod )
  
  Thanks!
• #6 by 935racer on 29 Jan, 2006 14:41
• Around 150WHP :twisted:
• #7 by Laurentian on 30 Jan, 2006 07:11
• Thanks Dave, who needs a GTI with those numbers
  Would the cam be money well spent?
• #8 by HP on 30 Jan, 2006 08:28
• Quote from: "935racer"

  Around 150WHP :twisted:

  
  And what about reliabiliy/duration??
  What reinforcement mods to be done in order to sustain all that power?