quote Originally posted by seajai: Found this on Wiki: 4,163 cubic centimetres (254.0 cu in) 90° V8 engine; 18.5 millimetres (0.73 in) cylinder bank offset; 90 millimetres (3.54 in) cylinder spacing; bore and stroke: 84.5 by 92.8 millimetres (3.33 × 3.65 in), stroke ratio: 0.91:1 - undersquare/long-stroke, 520.4 cc per cylinder I looked at this engine in a friends A8 quattro and the 1st thing that hit me was how short the engine was. I grabbed a tape measure and it's under 20".

Bore spacing is a pretty esoteric dimension that's not usually on Wikipedia. Hell Wikipedia only sometimes has bore and stroke.

Anyway, 90mm bore center is TINY. The 84.5mm bore and 92.8 mm stroke makes it pretty undersquare, but if it fits where it needs to go when nothing else will...

quote Originally posted by seajai: Yep, very short. But very wide. Not good for a transverse install, but nearly ideal for longitudinal. Of course, the engines aren't cheap...at least the newer ones, but sometimes you can get a very good deal on them if you buy a totaled car. I wouldn't count on using the Audi engine management though, unless you are also fitting most of the other stuff, due to the immobilizer technology they use. While I'm sure that it _could_ be done, the effort would be monumental compared to using something like Megasquirt.

If it uses a 58x trigger wheel and has fixed cam phasing/timing, then there are a variety of engine management systems which could run it.

[This message has been edited by Will (edited 06-08-2012).]

the 4.2 ABZ engine is 96 to 03 and can be had for as cheap as $300 but I have found that around $500 to $600 is about the average in the northeast . after thinking about it I feel that the Automatic is the way to go because Audi / VW have the tiptronic shift so you have manual shifting of the transmission just move the shifter over and smile while you have fun and i bet hooking up paddle shifter is easy just need the paddle shifter i bet

Ever driven one? There's no slap stick automatic on the market that drives the way it should. You could make coffee between bumping the shifter and the transmission shifting.

[This message has been edited by Will (edited 06-08-2012).]

Will i like Coffee, maybe it just needs some programing from one of the guru's

[This message has been edited by engine man (edited 06-08-2012).]

I found the 92-98 4 speed auto from the A6 was the least expensive for around $300 bucks. A8 4.2 engines from $500 bucks and up depending on year and miles. So it would seem the engine/tranny part is affordable, but what about engine management? Megasquirt was mentioned but I didn't see Audi on their website. Do you just build your own from parts? Which other systems are out there?

034 Motor Sports http://www.034motorsport.co...audi-v8-c-28_64.html for ECU or Stock ECU . try a 2001 VW Passat 2.8 V6 for the transmission they are the same as the A4 but are cheaper most of the time

[This message has been edited by engine man (edited 06-09-2012).]

quote Originally posted by engine man: 034 Motor Sports http://www.034motorsport.co...audi-v8-c-28_64.html for ECU or Stock ECU . try a 2001 VW Passat 2.8 V6 for the transmission they are the same as the A4 but are cheaper most of the time

Looks like the ecu stuff is gonna be spendy. Although it looks like the way to go to get some HP gains and for tuning purposes.

Well i just spent $1000 on a engine, standard transmission, ecu and wiring harness i will go back and pick it all up on wendsday .

quote Originally posted by engine man: Well i just spent $1000 on a engine, standard transmission, ecu and wiring harness i will go back and pick it all up on wendsday .

Cool. Post some pics when you get it. Is it a stock ecu?

yes stock ecu i will have to buy the chip from 034 motor sports though $500 . something interesting 2001 VW passat front track width 59 inches 1988 fiero rear track width 59.4 inches think the axles out of the passat might work

quote Originally posted by engine man: yes stock ecu i will have to buy the chip from 034 motor sports though $500 . something interesting 2001 VW passat front track width 59 inches 1988 fiero rear track width 59.4 inches think the axles out of the passat might work

So looking at the description for the chip, it would seem that an auto tranny is gonna need a TCU. Sounds like an auto could be more work without all the right stuff, unless the TCU is a stand alone system.

if i was doing a automatic i would use the stock ecu and tcu but you will need a 5 speed automatic like found in the latter 90's- 03 and it will work but if you try a 4 speed automatic the tcu isn't going to know what to do when it wants to shift into 5th gear but it can be done. you will need to make a wiring harness just like is done for any engine swap i need to find the wiring schematics for the Audi