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Power engine build do I use the AAZ or 1.6 GTD block
by
regcheeseman
on 19 Mar, 2009 02:38
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I'm building a power packed motor for mr MK1 golf - decent intake and VNT15.
I have AAZ and GTD engines at my disposal - what would you use as the donor?
People have suggested AAZ head on GTD block - why? why not use the complete AAZ - is it purely the revvy feel of the 1.6 that people prefer?
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#1
by
subsonic
on 19 Mar, 2009 05:08
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The straight AAZ will have more torque. You will have more power low end, especially if you are adding a vnt. It will still rev, just not as high or as fast as a 1.6 although with a vnt thats another story. It also has better flowing ports on the head then the 1.6 .
The straight up 1.6 will make it power higher up in the rpm scale and rev a bit higher. Not as much low end torgue as the 1.9.
The 1.6/1.9 combo is a hybrid that gives you the ability to rev higher with the bonus of a better flowing head and slightly lowered compresson due to the larger head. The lower compression allows for higher boost levels.
The 1.6/1.9 combo is better then the sttaight 1.6 hands down if you are wanting power. The aaz is bigger. Displacement is important. It will not rev like the other two due to the heavier crank but it will give you power down low which will result in a different driving experience. One of the main concerns with the 1.6 lower end is strength. The block will flex and the rods are questionable with high boost at low rpms. Power and boost need to come on later.
Are you interested in max hp or a fast around town driver?
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#2
by
regcheeseman
on 19 Mar, 2009 06:16
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I like lazy - fast.
I normally drive, short shifting at about 2500rpm, get into top gear as soon as possible.
Grunt it around on torque 95% of the time.
Nice to have the reserve of revs there for 'educating' petrol heads. :wink:
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#3
by
Rabbit on Roids
on 19 Mar, 2009 07:52
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go with a turbo 1.5! not much for bottom end, but once the turbo spools on mine, it gets with the program. and lust by ear, it sounds like they turn about 6 grand pretty easy. my 1.5 turbo motor has way more balls than my 1.6 engines. but an AAZ with a FN 5 spd (.71 5th) would be pretty ***in too. have enough torque to pull ANY hill in 5th gear. and any vw diesel likes a VNT. throw a gasser intake on it when you build it, unless you go with the aaz head. then you could use a 1y manifold.
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#4
by
TurboJ
on 19 Mar, 2009 09:30
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If torque is what you want, better make it AAZ.
Just make sure you fit a new crank bolt in there.
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#5
by
subsonic
on 19 Mar, 2009 10:26
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If torque is what you want, better make it AAZ.
Just make sure you fit a new crank bolt in there.
You could have the nose modified to accept the tdi sprocket while it is apart. Not sure if you could lighten the crank. It would take very good machining and a good balance job when finished. Lighten what you can, polish the rods, lighten the crank, turn the IM shaft, lighten the flywheel etc. There is good power to be had out of an AAZ. The vnt will play a big role in low end grunt. You have access to many good parts over there.
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#6
by
Rabbit on Roids
on 19 Mar, 2009 10:43
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*totally agrees with the lightening and balancing statement above*
i took and hand balanced a friends 22r toyota engine with his marijuana scale, and for being a stock engine, it sure had more power after being balanced. its amazing what you can do with a scale, dremel, and file..
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#7
by
arb
on 19 Mar, 2009 10:47
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*totally agrees with the lightening and balancing statement above*
i took and hand balanced a friends 22r toyota engine with his marijuana scale, and for being a stock engine, it sure had more power after being balanced. its amazing what you can do with a scale, dremel, and file..
Wasn't a surprise how much difference there was from rod to rod, piston to piston ? It was to me the first engine I "blue printed" as we used to call it.
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#8
by
Rabbit on Roids
on 19 Mar, 2009 10:49
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i dont remember how much of a difference it was, but i remember removing ALOT of metal from a couple different pistons and rods. i was 17 when i did that, and lets just say ive crammed alot more knowledge in my head since then. i just wish there was more space up there in that thing between my ears.
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#9
by
regcheeseman
on 19 Mar, 2009 15:00
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We don't get the 1.5 over here, but the 1Y mani looks favourite too.
Think I'm getting a plan together......
AAZ pump with 10mm head
VNT 15
AAZ engine - with a bit of work on it
1Y intake.
That'll do me.
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#10
by
subsonic
on 19 Mar, 2009 20:31
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What kind of work on the aaz? Head porting if done correctly will give you the ability to have great gains. The done correctly is the important part. We dont have too many people on this side of the pond that are knowledgable on serious vw diesel head porting. How about over there?
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#11
by
Smokey Eddy
on 20 Mar, 2009 01:50
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I crossed an AAZ head with a 1.6TD MF block with magnificent results (magnificent compared to what it was anyways). With a ported and polished 1.9 head it has loads of low end power that it never had before and will take you to 70mk/hr in 2nd gear in just a couple seconds.
But, im sure everyone's mileage varies
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#12
by
RabbitJockey
on 21 Mar, 2009 07:48
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i think an aaz will bring more power in the end and be more reliable, it is a bigger engine you know, i am going to do a 1.6/1.9 just cause i like to be different, although it seems alot of people have been doing this haha.
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#13
by
Rabbit on Roids
on 21 Mar, 2009 10:13
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thats why you gotta be really tricky, and make a 1.5/1.6/1.9, but someone has probably built one of those by now.
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#14
by
RabbitJockey
on 21 Mar, 2009 12:41
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thats why you gotta be really tricky, and make a 1.5/1.6/1.9, but someone has probably built one of those by now.
yeah i'd love to see 1.5 internals in a 1.6 block a 1.9 head. something i'd like to do if i ever finish my jetta is to build an na engine to high hp just to show it can be done. but i gotta build one motor before i start talking poop like that haha.