1.9 head on a 1.6td block or variations

[homerj1]

Hello,

I have a 1.6td engine that has has NA head on it. Engine need to be reringed.

Can I put a aaz head and turbo on this?  Or can I put my aaz turbo\manifold and use the NA head?

thanks

[CrazyAndy]

Yes you could, but don't forget the differnces in intake port design between the 1.6 and AAZ.

Some folks have build 1.6/1.9 hybrids already.  The AAZ head is better for being able to get more boost into the cylinder due to the bigger ports IIRC, but I'm not 100% sure since I've never done it myself.

[TurboJ]

The 1.9 head flows more than the 1.6 head, this is true.

But since you have to change your inlet manifold (the inlet ports are a different shape), you should then choose the right inlet manifold
for your purpose as well. Of course you can use the stock 1.9 inlet if you don't need huge power.
The AAZ exhaust manifold can also be an improvement - a late style AAZ exhaust manifold with the three-bolt flange will allow your
turbo spool quicker than the older four-bolt version. But then you need to think about which turbo you can use... So it goes on.

And just so you know, the 1.6 N/A head is exactly the same as a 1.6 TD head.
The only differences between the two engines are the oil jets on the TD block,
and the middle piston rings which have a chromium outer side plating on the TD, but not on the N/A.

[theman53]

From what my machinist tells me the TD heads have a sodium filled exhaust valve as well.

[TurboJ]

From what my machinist tells me the TD heads have a sodium filled exhaust valve as well.

Interesting! Many 80's OE turbo cars did have those. It would seem there isn't a visual difference between the TD and N/A valves though -
that would mean the sodium-filled ones would not have the typical thick build of many other car manufacturers' designs...
I remember from my Saab days one of the first things one typically did was take out the thick sodium-filled exhaust valves of 900 turbos
and replace them with N/A regular ones for improved flow Never heard an issue there, even though some ran the 8V heads at 370 hp.
...suggesting the sodium valves aren't terribly necessary - if VW indeed used those on the 1.6 IDIs.

[RabbitJockey]

When I had my head done I talked to the machine shop about sodium valves they said its not necessary, and I almost think that later engines didn't have the sodium valves.  They even said that except for on race cars it's not necessarily an advantage because it can just make the guides and seals wear out faster because it passes that much more heat.  I had them put in anyways against their advice because i wanted all the correct parts on my engine looking back I wouldn't get them if I could have a do over they were atleast double the price of regular exhaust valves.

[RabbitJockey]

Also this has gone off topic, but I thought the tds also had a slightly different pre chamber

[Blocksmith]

One important thing I don't think that's been asked yet---is the block mech or hydro? If mech, it's more difficult to retrofit an AAZ head. It's still possible, but you've got to do something about the gaskets not matching correctly.

[homerj1]

Thanks for all the input!  Although I guess I wasn't clear in my initial questions. (damn our strong Canuk  beer )

So to clarify:

The na head that is on the 1.6 td block is attached to a 3 speed auto trans and in a 84 Jetta. I know I could probably use some more power considering the n/a auto trans combo.

I think  I have 4 choices - the first 3 will include a rering of the existing 1.6td block and I think would be the cheapest and quickest way to get the rig running and on the road.

1. Run the existing set up. n/a head on td block and cry when I press the accelerator to the floor.

2. Using my na head try to install my aaz intake and exhaust with turbo

3. Install the aaz head with aaz manifolds.

4. Rebuild a complete aaz engine and install into car.

thanks for your help,

[CrazyAndy]

3 or 4, I'd just go for 4 if you know a guy with one.  You can't do 2 because the D ports of an AAZ intake don't match the oval pots of the 1.6 heads (my bad I didn't specify that in my OP).

Also if there's a manual attached to the AAZ you get if you decide to do 4, then go ahead and get that as well.  Unless you really NEED the auto for reasons of physical health or something.

[homerj1]

3 or 4, I'd just go for 4 if you know a guy with one.  You can't do 2 because the D ports of an AAZ intake don't match the oval pots of the 1.6 heads (my bad I didn't specify that in my OP).

Also if there's a manual attached to the AAZ you get if you decide to do 4, then go ahead and get that as well.  Unless you really NEED the auto for reasons of physical health or something.

So an azz head will bolt right up? As long as it is a hydro block?  Are the timing gear components  the same?

Although the more I think about it, I should just rering\ overhaul the aaz and install it.  Then drive with the auto. for a while ( push the throttle pedal down & go like hell!!! ,) and then install a 5 spd. at a later date. ( there are time and $$$ restraints)



thanks

ab

[RabbitJockey]

unless you do alot of highway driving i'd keep the automatic, i had one and i loved it, i still got good mileage too, pretty rare too

[8v-of-fury]

I think a 1.9AAZ 3pd auto would be pretty bad ass . HOWEVER! It fully depends on what turbo the AAZ has on it.. If it has the k03 it will NOT like highway driving @3000rpm at all. The turbo is nearly out of its efficiency range at that point and will be pumping all kinda of hot air in to the engine = bad mileage.

If you have the T3 from the 1.6TD you have on the 1.9 AAZ, along with the 1.9 intake manifold, you'd have a high RPM warrior.. and you'd rock that auto like nobody's business.

An AAZ, albeit diesel, will motor along very happily at 4000RPM (with the right turbo of course ) with no ill side effects. Been there done that ! LOL Lost 5th in the tranny and had to do 2.75 hours home in 4th.. 120 km/h = ~4000rpms.

[Blocksmith]

An AAZ, albeit diesel, will motor along very happily at 4000RPM (with the right turbo of course ) with no ill side effects. Been there done that ! LOL Lost 5th in the tranny and had to do 2.75 hours home in 4th.. 120 km/h = ~4000rpms.

Did it run a lot warmer, or was the temp about like normal?

[8v-of-fury]

Hmm, the temps were the same or cooler to be honest.