FRANKENENGINE topic-NEW HEADS AAZ VS 1.6hydro/daily vs. preformance - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• FRANKENENGINE topic-NEW HEADS AAZ VS 1.6hydro/daily vs. preformance by golfmk1tdr on 21 Apr, 2015 12:25
• So I have option for buying new head from this guy, he has both 1.6 and 1.9 TD new heads without valves/cams itd. for cheap.
  I don't have money right now but he said he will spare me the one I choose if I tell him soon enaugh so I hope this thread takes off..
  
  I have 1.6 TD in my mk1 golf, HOLSET He200WG turbo is currently in customs and new turbo manifold is home already.
  
  My head (stock rebiuld) is fine for now, but I would like to have a backup head since it looks like good deal and I don't expect 25 yrs old head will last forever on 1.5+ bar boost 
  
  I use car daily, winters are chilly in Europe so I am leaning towards replacement 1.6 head.
  
  But with this many frankenengines on this forum I was wondering:
  1: is AAZ stronger head, construction or material-wise? (both are new! there shouldn't be much difference right?)
  2: how big difference does bigger valve and cam make power wise? (or EGT-wise)
  3: are AAZ precups big advantange for boost power? Can they sustain more EGT?
  4: is there any advantage at all for frankenegine if I stay on stock (gov./fuel screw adj.) fuel pump?
  5: does 1.6 cam work on AAZ? or vice versa?
  6: does anyone use frankenengines in winter? Can it start at -15 celsius without block heater?
  7: is instalation any different to changing stock hydro head?
  8: how much more usable revs can you get with frankenengine vs. 1.6?
  
  Some  things I do know about AAZ head/1.6 combo:
  Belt is the same for both engines.
  AAZ head gives bit less compression(bigger prechamber).
  Injectors are the same.
  AAZ camshaft has more lift.
  
  I know this is much discussed on this forum, but I think there should be one topic specifically for all of
  us considering Frankenengines so we don't have to read through 100 pages to make sense of this.
  Some say it doesn't work at all, some say it makes less torque, some say cold starts are impossible but still so many Frankenengines,
  it has to have advantages...
  
  Please stay on topic, I have another thread for my car so unrelated things there of PM me 
  Also post links where this was already discussed so I can summarize in this thread.
• #1 by vanbcguy on 21 Apr, 2015 12:26
• Nearly everyone who's put a 1.9 head on a 1.6 has reported hard cold starts and lots of smoke when cold... Unless you're building a race engine you probably don't want one.  A ported 1.6 head will probably do better than a stock 1.9 head flow-wise...
• #2 by theman53 on 21 Apr, 2015 17:50
• I have a 1.6 head but the compression ratio is less than if I had an aaz head. It will start after sitting for months for sure with no block heater down to 11f. If you are just putting lip stick on the pig *new head and 400,000 mile bottom* don't expect that. If you did a good job rebuilding it and breaking it in it should start.
  To answer vaguely most of your questions, the heads are about the same in all aspects of material and install. The biggest deal is the bigger valves of the aaz. They will help add air which will cool the EGT. Revs and most other questions you had will be about the same, that would depend on fuel not the more air from the head...like I said it will help lower EGT, but then you have to make the adjustments to the fuel.
  
  I am 99% sure the aaz cam is not as good as the earlier 1.6 hydro cam for lift and duration. Burn your money had a list of cam profiles that I cannot find. The cams will swap.
• #3 by Powered by Spearco on 21 Apr, 2015 20:26
• I have the 1.6L TD with the 1.9L AAZ head conversion and I like it. Never had any issues starting. I used to daily drive mine as well.
• #4 by manehfr on 22 Apr, 2015 04:03
• but some would say that you have to drill holes in the head or block to pass water because thei dont really match in the 1.6 head and the 1.9...
• #5 by RabbitJockey on 22 Apr, 2015 05:53
• Quote from: manehfr on 22 Apr, 2015 04:03

  but some would say that you have to drill holes in the head or block to pass water because thei dont really match in the 1.6 head and the 1.9...
  

  
  no that is only if you are putting a 1.9 head on a solid lifter 1.6 block.  1.9 heads have some coolant breather holes that you can drill in to the 1.6 block but it is not necessary.
  
  but aaz and 1.6 use different timing belts, but a 1.6 with an aaz head should use a 1.6 belt.  i don't think aaz cam shaft has more lift, they are slightly different but also interchangeable. the injectors are not the same but are interchangeable.
  
  i think which head you run should be dependent on your power goal.  if below 150hp i think id stay 1.6
• #6 by jmaddocks on 22 Apr, 2015 06:24
• Depending on what intake manifold you're using, the "d" shaped ports on the AAZ head might be a consideration as well.  I'm running a Corrado G60 intake manifold that would need to be gasket-matched to the AAZ ports if I go that route.