[billzcat1]

I'll admit, I'm an Audi guy so I've got a few VW questions that are probably a piece of cake for you guys.
My girlfriends' car was wrecked a while back, Montana Green 8v Gti - I just bought a 1990 Jetta GLI 16v for parts for it - the motor is running but badly needs a rebuild. Of course, she appreciates performance and whatnot but isn't a huge top-end driver like me - I have a Coupe Quattro 20v which is a little sluggish off the line but hey I walked away from a souped-up El Camino on the freeway a couple days ago.
Anyway enough rambling....I was thinkin of doing a 2.0L 8v setup using the block from the 16v motor and the head from her 1.8L Digi motor. I also wanted to use the Motronic injection since neither of us really like the Digi system.
Now, will the 8v head bolt on the 2.0L block without creating compression issues? We're looking to keep 10:1 or so, maybe a little higher wouldn't hurt.
I don't know a ton about Motronic but will there be room for all the sensors, etc? I'm pretty sure that this is a rather unorthodox project (which appeals to me).
Thanks guys!



[Modified by billzcat1, 3:26 AM 11-30-2001]

 

[vwpat]

Re: Motronic 2.0L 8v? (billzcat1)

On the injection side, pretty much everything except the fuel lines has to be changed but you have a donor car. 8v head on 16V shortblock will bolt on but comp. will be ~14:1 unless you change to 8V (3A) pistons.

 

[mk2jetta]

Re: Motronic 2.0L 8v? (vwpat)

why no do the vw 2.0l 8v?!? less hassle
sell the 2.0l 16v and 1.8l 8v

 

[dianalynnxk]

Re: Motronic 2.0L 8v? (mk2jetta)

quote:[HR][/HR]why no do the vw 2.0l 8v?!? less hassle
sell the 2.0l 16v and 1.8l 8v

[HR][/HR]​

Well From my personal experience driving a New Beetle with the 2.0L 8v I wasn't impressed. I think the 1.8 8v has more grunt.
I'm gettin the impression that I'm just going to build the 16v motor for her instead...but I really wanted to try something different dammit!

 

[vwpat]

Re: Motronic 2.0L 8v? (dianalynnxk)

quote:[HR][/HR]Well From my personal experience driving a New Beetle with the 2.0L 8v I wasn't impressed. I think the 1.8 8v has more grunt.[HR][/HR]​

The New Beetle 2L (AEG) is a different engine than what we are talking about (93-99 ABA). Plus the A2 is ~700 lbs, less than the NB.

 

[Numbersix]

Re: Motronic 2.0L 8v? (dianalynnxk)

quote:[HR][/HR]The New Beetle 2L (AEG) is a different engine than what we are talking about (93-99 ABA). Plus the A2 is ~700 lbs, less than the NB.[HR][/HR]​

Right...if you P&P the head and install a cam and chip in the Digi car, that 8v motor would be very gutsy. The Beetles are porky little cars and the 2.slow is named that for a reason in that installation. vwpat is right, you're looking at a weight loss of ~6-750 lbs (depends on how the GTI is optioned) between an A2 hatch and NB. You might want to ask a2LGTI about it--I don't know him but I know he's selling a car that has a swap almost identical to what I'm describing.
The 16v would be cool, esp. given you have the donor car for the rear disc brakes, transmssion, etc. Just depends on whether or not you'd want to do all the Digifant to CIS-E wiring swap.


[Modified by SeattleGLI, 7:24 PM 11-30-2001]

 

[155VERT83]

Re: Motronic 2.0L 8v? (vwpat)

quote:[HR][/HR] Plus the A2 is ~700 lbs, less than the NB.[HR][/HR]​

The NB is a little porker...

[Modified by 155VERT83, 11:39 AM 11-30-2001]

 

[OilSpotz]

Re: Motronic 2.0L 8v? (vwpat)

quote:[HR][/HR]...Plus the A2 is ~700 lbs, less than the NB.[HR][/HR]​

Damn that flower vase!

 

[dianalynnxk]

Re: Motronic 2.0L 8v? (SeattleGLI)

[Modified by dianalynnxk, 10:51 PM 11-30-2001]

 

[billzcat1]

Re: Motronic 2.0L 8v? (OilSpotz)

CIS-E? I thought that the 16v motor ran Bosch Motronic? Of course I'm always open to corrections I am certainly not a VW specialist.
Were you suggesting that we keep the 1.8L Digi and just port and polish, get cams, shave head, etc?
Thanks again guys

 

[Numbersix]

Re: Motronic 2.0L 8v? (billzcat1)

Oops, my bad--meant to say CIS-Motronic.

I was sort of following the above post about perhaps doing an 8v xflow motor swap, but either the xflow (AFAIK) or the 16v would require swapping the eng. management system too.
For me, it would depend on a)what could I get for the Digi motor/ECU/etc if sold, b)how much $ the 16v motor is going to cost to rebuild, c)how much work/time do you want to invest in doing a motor/trans swap (8v-->16v) and then rewiring everything.
I know her car was hit--did you buy the parts car for body parts too? Or just the drivetrain/brakes/?
The 2.0l 16v with CIS-Motronic can give you great power--150+hp fairly easily with chip/cams/50mm intake/etc.



[Modified by SeattleGLI, 11:45 PM 11-30-2001]

 

[kmead]

Re: Motronic 2.0L 8v? (SeattleGLI)

The Motronic system is a CIS-E system. Your Bentley even refers to is as such. The later Motronics are based on the LE system (A3 and beyond).

 

[vwpat]

Re: Motronic 2.0L 8v? (SeattleGLI)

quote:[HR][/HR]but either the xflow (AFAIK) or the 16v would require swapping the eng. management system too. [HR][/HR]​

Unless you swap just the short block.It would be alot of work to do the 16V swap but you have everything since you have a donor car.


[Modified by vwpat, 11:33 AM 12-1-2001]

 

[Andrew Foss]

Re: Motronic 2.0L 8v? (vwpat)

the easiest thing to do would be keep digifant (its better then cis-e motronic, there are 16v guys who have swapped to digifant for a performance increase) and jsut throw 2 headgaskets in there, that should lower the compression down to pump gas levels, it might actually take 3. then get an adjustable camgear (the height will throw off the timing) and thow it in there. i thinkt he gasket to use would be the 2.0 16v gasket. selling the 16v head will be no problem, and this way the swap will be a snap. if anyone knows why this wouldewnt work...please post up.
-andrew
ps-what kinda compression would an ABA block with a 16v head have? turboable compression? or still too low?

 

[Trav]

Re: Motronic 2.0L 8v? (Andrew Foss)

quote:[HR][/HR]the easiest thing to do would be keep digifant (its better then cis-e motronic, there are 16v guys who have swapped to digifant for a performance increase)[HR][/HR]​

I don't believe that to be true.

 

[Andrew Foss]

Re: Motronic 2.0L 8v? (Trav)

quote:[HR][/HR]I don't believe that to be true.[HR][/HR]​

well then, you are wrong. its been done, with positive results, its also been discussed that vw motorsport had their 16v's running digifant. as far as i am concerned cis might as well be a carb. no i havent done the swap, and no i have never seen one in person, but i know it is done, and performance increases are fairly large. i guess you need a custom fuel rail and some other little things to get it to work, but its suposedly much better then cis for that application, and i dont doubt it, having worked on, modified, and ridded in 8v's with both types, the digifatnn definatly responds better to mods. why would it be diffrent in a 16v?
-andrew

 

[Trav]

Re: Motronic 2.0L 8v? (Andrew Foss)

quote:[HR][/HR]as far as i am concerned cis might as well be a carb
[HR][/HR]​

 

[Andrew Foss]

Re: Motronic 2.0L 8v? (Trav)

just talking about mechanical fuel injection in general.

 

[vwpat]

Re: Motronic 2.0L 8v? (Andrew Foss)

I have to agree with Trav. The "digifant" that VWMS may use (they usually use MBE or some other aftermarket system) is probably the more advanced Digi 3 use on the Mk3 cars in europe.

 

[Andrew Foss]

Re: Motronic 2.0L 8v? (vwpat)

all im saying is that it is done as a mod, and it works as an upgrade for a 16v with cis-e or cis-e motronic. its not all that common but people who have done it swear that its a pretty big diffrence. if you wanna talk about this more, post a new thread because this is way off topic for this thread.
-andrew