Debating an s6 4.2L swap...

[biketsai]

http://www.ebay.com/itm/Engine-Motor...item2c5f74acbd
Not sure if its the right one though, seems a tad sketchy.

[JumboBlack1.8]

car-part.com ?

Thanks! I've contacted quite a few salvage/junk yards from car-part a few days ago.....still waiting on replies from most of them.

http://www.ebay.com/itm/Engine-Motor...item2c5f74acbd
Not sure if its the right one though, seems a tad sketchy.

I heard from that guy yesterday afternoon....apparently that motor is sold. He's got some other S8 engines, but his prices for everything (motor, harness, ecu, cluster, etc) are a bit higher than I'd like to pay.....Not to mention the $300 core fee...

I also contacted Shokan, but they're prices were outrageous......$4500 + $350 shipping for a BARE longblock....no manifolds, accessories, or anything.....just the shortblock and heads......No thanks

Looks like I'll need to be a bit more patient in my search.......damn

[beemercer]

If you can get an S6 motor cheap I'd go that route. I don't think the exhaust cam will make a massive difference. Take the money saved and get a lightweight crank pulley/lwfw/more aggressive tune, you'll love how snappy and responsive it is.

Whats the plan for exhaust, keeping the stock exhaust manifolds?

[JumboBlack1.8]

The best price on an S6 motor was $1950 shipped included everything (all accessories, harness, cluster, ecu)....but I'm trying to get them to send me a picture of it before I agree to buy it. I've also asked these same people to source an S8 motor, but I haven't gotten a response since early Friday afternoon.....Hopefully they'll get back to me some time soon

As for the exhaust....I'm keeping the stock exhaust manifolds, but I"m torn between running Piggie Pipes, or forking over some extra coin for some proper DPs with high flow cats.....The JHM headers are way out of the budget, and I'm assuming they won't even fit between the B5 frame rails......Then, I've gotta find a decent exhaust shop that can fab up decent catback.

I'll definitely be getting at LEAST a lightweight flywheel. MIGHT look into the lightweight crank pulley as well. Was thinking of keeping my Spec Stg3+ clutch....I've grown pretty fond of it, and it's still got plenty of meat left.

[revolution337]

If that deal on the S6 motor is legit, I'd definitely go that route. That's a damn good price for everything shipped. Kinda makes me wish I would have looked around a little more before I purchased my engine.

[VirginiaBeachA4]

Subscribed! Would like to do this as well.

[beemercer]

The best price on an S6 motor was $1950 shipped included everything (all accessories, harness, cluster, ecu)....but I'm trying to get them to send me a picture of it before I agree to buy it. I've also asked these same people to source an S8 motor, but I haven't gotten a response since early Friday afternoon.....Hopefully they'll get back to me some time soon

As for the exhaust....I'm keeping the stock exhaust manifolds, but I"m torn between running Piggie Pipes, or forking over some extra coin for some proper DPs with high flow cats.....The JHM headers are way out of the budget, and I'm assuming they won't even fit between the B5 frame rails......Then, I've gotta find a decent exhaust shop that can fab up decent catback.

I'll definitely be getting at LEAST a lightweight flywheel. MIGHT look into the lightweight crank pulley as well. Was thinking of keeping my Spec Stg3+ clutch....I've grown pretty fond of it, and it's still got plenty of meat left.

Damn, $2k for everything ... I'd have trouble passing on that.

For exhaust I'd go for 2.5" downpipes with cats downstream. The S6 will have the bigger exhaust manifolds and should have a decent amount of headroom over what pippie pipes will flow. Typically its 350whp for the stock smaller exhaust manifolds and 300whp for piggie pipes before they start choking the motor off. For the catback 2.5" with an x-pipe is your best bet.

[biketsai]

Damn, $2k for everything ... I'd have trouble passing on that.

For exhaust I'd go for 2.5" downpipes with cats downstream. The S6 will have the bigger exhaust manifolds and should have a decent amount of headroom over what pippie pipes will flow. Typically its 350whp for the stock smaller exhaust manifolds and 300whp for piggie pipes before they start choking the motor off. For the catback 2.5" with an x-pipe is your best bet.

Well how much power does the S6 motor put out with piggies? Does it even need them?
All this V8 talk actually has me interested.

[sgt_g]

Well how much power does the S6 motor put out with piggies? Does it even need them?
All this V8 talk actually has me interested.

You and me both, makes me realy want to do it.

[NeedingAnAudi]

Uh oh. I found a 2000 a6 4.2 for 2500............

[beemercer]

Well how much power does the S6 motor put out with piggies? Does it even need them?
All this V8 talk actually has me interested.

Piggies, JHM 93 tune and a good catback should be up around 300whp. My B6 S4 was 328whp/300wtq on a mustang with a ported intake manifold (a wash compared to the S6 manifold), catless 2.5" Milltek downpipes (2.5" is key, better option than piggies so some extra power there), 2.5" X-pipe catback and JHM 93 tune.

So looking at the differences between the two (my S4, S6 4.2 with piggies/catback/tune)
Intake Tract - No advantage: Should be the same, S6 has 3 inlets same with 05 S4s, same MAF and TB, similar inlet piping
Intake Manifold - No advantage: Single flap ported vs dual flap stock porting, doubt one flows better than the other
Heads - No advantage
Compression - No advantage: Both 11.0:1
Displacement - Slight advantage to the S6: 0.6cid more due to 93mm stroke vs 92.8mm
Cams - Slight Advantage to the S4: Bigger exhaust cam
Exhaust Manifold - Advantage to the S6
Downpipes - Advantage to the S4
Catback - No advantage
Tune - No advantage: Same tuning mostly, iirc the S4 can do a bit more with the cam phasing but I'm not positive


Just looking through it I don't see a healthy piggie/tune/catback S6 4.2 making less than 300whp. The S6 actually doesn't have precats iirc, but are the stock downpipes gonna fit in a B5?


For everyone interested in 4.2s, the general rules for making good N/A power:
-No precats
-2.5" exhaust piping
-X-pipe
-Need a good tune to extract the power, the only people doing good tunes is JHM. Their calibrator works for SVT and recently helped on the Coyote 5.0 V8s and we all know how those turned out (my point being he knows how to tune N/A cars, not many Audi tuners do). If you go standalone then its obviously a different issue

[beemercer]

Uh oh. I found a 2000 a6 4.2 for 2500............

hows the tranny in it? If its good I'd buy it, turn the tranny to someone with a busted one (the 4.2 auto trans are garbage), get an 01e and go from there. I need some odds and ends from a 4.2 part car so I think you should buy it so I can get my parts lol

[nate09]

You and me both, makes me realy want to do it.

I've already started looking for another B5 to do the swap to, but I'd be waiting for awhile (late winter) to actually start this project.

[NeedingAnAudi]

hows the tranny in it? If its good I'd buy it, turn the tranny to someone with a busted one (the 4.2 auto trans are garbage), get an 01e and go from there. I need some odds and ends from a 4.2 part car so I think you should buy it so I can get my parts lol

haha trans is in limp mode. I'm going to attempt to fix it and probably flip the car. If not, then part out, I'm sure a6 guys love the chance to jump at some 4.2 widebody goodiness

[beemercer]

haha trans is in limp mode. I'm going to attempt to fix it and probably flip the car. If not, then part out, I'm sure a6 guys love the chance to jump at some 4.2 widebody goodiness

haha shocker about the transmission... lol. If you decide to stick with it a manual swap would make the car very attractive for a resale, if you want to stick with the auto user 'TozoM8' is the guy to contact about rebuilding it

[NeedingAnAudi]

haha shocker about the transmission... lol. If you decide to stick with it a manual swap would make the car very attractive for a resale, if you want to stick with the auto user 'TozoM8' is the guy to contact about rebuilding it

Actually I work with a couple ex-audi techs, (they found out that VW was hiring in their desired city so they moved over) and from what they have been telling me, the auto trans isn't a piece of junk at all. Neither had seen many come in for repairs in either of there 5+ years at Audi.

[beemercer]

the number of 4.2 A6 owners I've talked to that have replaced transmissions/torque converters is much higher than any other platform.. granted its due to poor maintenance habits but the other autos hold up better.

[JumboBlack1.8]

What do you think would be a good price to pay for a complete 2001 S8 setup? Harness, accessories, and ecu all included........Just got a quote from a local (Force5Auto), and I'd LOVE to not have to deal with shipping (plus, I have yet to see ANY physical evidence of any of the motors in the quotes I've gotten).......I've set a strict budget, and I'd like to not go over it.....but I don't wanna lowball the guy.....Was REALLY hoping to get everything for under $3k, on the high end.......Is that unreasonable?

[revolution337]

I think its reasonable to ask 2500-2750 for all of it. Do you know the mileage of the engine?

[JumboBlack1.8]

Found a 2001 s8 motor with 25k original miles......They want $3200 shipped for everything......that's more than I wanted to spend, but I'm VERY enticed by the low usage....

[JumboBlack1.8]

Found a 2001 s8 motor with 25k original miles......They want $3200 shipped for everything......that's more than I wanted to spend, but I'm VERY enticed by the low usage....

*EDIT*

Contrary to what was posted on the previous page, the S8 crank has an 8-bolt pattern, NOT 10-bolt

[beemercer]

yeah older V8s and the RS6 are a 10 bolt, the rest are 8 bolt and the standard flywheels go right on. I'd buy that motor personally, see if they can run a compression test on it for some piece of mind

[JumboBlack1.8]

I'm gonna try to get them down to $3k shipped. And I'll see about them running a compression test for me. Also waiting to see if we're on the same page about the motor being "complete".

[beemercer]

Haha, probably a solid idea to agree on what complete is haha

[NeedingAnAudi]

3k for everything? Sounds good to me

[JumboBlack1.8]

Update.....I'm having some second thoughts about ordering motors from places on Car-part.com or other online salvage yard resources.....I've been reading a fair amount of reviews from people who've have bad experiences, so I've begun to grow paranoid of trusting a company I've never had any prior experience with.

So, that being said, I've found a motor at Force5 Auto in Concord, NH, which is relatively local to me. The motor is from an 01 S8 and includes everything for $3k. But, the mileage is high, at 128k.......That's MUCH higher than I wanted, but the engine has been tested, and has a warranty. Also, Chris Semple is a very well known and trusted guy in the local community, so I have faith that the engine will be as good as he says it is. Think I'm gonna try to strike a deal with him some time next week!

[beemercer]

if you can pull the valve covers to get an idea of the oil history, compression test and maybe borescope the cylinders I'd have no worries about buying a higher mileage timing belt 4.2 nothing really fails internally. My A6 has 156k miles and still runs very strong.

[JumboBlack1.8]

^^Any idea who I can contact at JHM about getting the tweaked Euro S8 file? I'm hoping to complete this swap in 2 weeks.......Also, would love to know where to get some 2.5" downpipes for a reasonable price? I've PM'd Greg@Griffin to see if the Milltek Group Buy is still on

[revolution337]

Any info you can get on a tune for the engine or downpipe (well, any good info about the swap for that matter), if you wouldn't mind sharing this info with me I'd appreciate it. I've been looking around for places to get a tune for this engine and I haven't had much success yet.

[NeedingAnAudi]

Don't mean to intrude but uh, I just acquired this.



Drove this bitch 12 miles in trans limp mode.

[JumboBlack1.8]

^^Awesome man! Have you decided what you're going to do with it???

Also, just wanted to update this thread, as I've found some very important information in my research.......Evidently, I'll need to use the A6 V8 upper and lower motor mount brackets to get the motor to fit in the OEM location, without any fabrication.....the S8 engine has different engine mount points than the standard a6 v8 motor. While the mounting points on the block surface are the same, the upper and lower engine mount brackets are slightly different. The passenger side mounts is an easy swap......but on the driver's side, the S8 oil filter housing (which is a completely different design than the A6.....not exactly sure why) is integrated into the motor mount bracket.....So, I'll be picking up a new set of motor mount brackets AND an A6 oil filter housing.......Hopefully then, the motor will drop right in

The hard part is going to be finding a solution for the FRONT engine mount (it's a torque mount on the PS that bolts to the frame rail.......it essentially replaces the snub mount).....I'll likely have to fab up something.......somehow....

Should be picking up the engine this week! I'll post pics as I get them

[revolution337]

^^Awesome man! Have you decided what you're going to do with it???

Also, just wanted to update this thread, as I've found some very important information in my research.......Evidently, I'll need to use the A6 V8 upper and lower motor mount brackets to get the motor to fit in the OEM location, without any fabrication.....the S8 engine has different engine mount points than the standard a6 v8 motor. While the mounting points on the block surface are the same, the upper and lower engine mount brackets are slightly different. The passenger side mounts is an easy swap......but on the driver's side, the S8 oil filter housing (which is a completely different design than the A6.....not exactly sure why) is integrated into the motor mount bracket.....So, I'll be picking up a new set of motor mount brackets AND an A6 oil filter housing.......Hopefully then, the motor will drop right in

The hard part is going to be finding a solution for the FRONT engine mount (it's a torque mount on the PS that bolts to the frame rail.......it essentially replaces the snub mount).....I'll likely have to fab up something.......somehow....

Should be picking up the engine this week! I'll post pics as I get them

I'll probably end up just fabricating something sort of like russian did with his swap.

[NeedingAnAudi]

^^ excellent idea. I forgot that russian did that, and it looks like it could be easily reversible if anyone wants to go back to a 1.8

[capea4]

Not only am i right down the street from you (rt 3), but i also have both a B5 A4 and a D2 S8. Someday that motor will be swapped, wating for a tourist to take out the S, maybe next summer. I can tell you that the S8 4.2 is bye far the greatest v8 i have ever owned, even in the D2 it gets up good.

[AudiA4_20T]

I'm gonna buy a damn rs6 one day. That torque must be absurd

[NeedingAnAudi]

^^Awesome man! Have you decided what you're going to do with it???

Not really sure what to do just yet.
Couple options

Fix it and daily it
Fix it and sell it
Part it out
Sell back to the previous owner

[revolution337]

Not really sure what to do just yet.
Couple options

Fix it and daily it
Fix it and sell it
Part it out
Sell back to the previous owner

if you go this route, I may need some parts from it.

[JumboBlack1.8]

I'll probably end up just fabricating something sort of like russian did with his swap.

Maybe its just the pictures, but that looks somewhat flimsy to me....But I'll see if I can come up with something similar with my VERY limited fabrication skills

Hoping to pick up the engine and motor mount brackets in the next day or so......2.0T motor is coming out tomorrow .....Still waiting to hear about a set of Milltek catless downpipes...THEN, all I should theoretically have to do is source an S4 lwfw, and some dual 12" radiator fans (thinking of getting 2 SPAL pusher fans....one that will always stay on, and another that'll be tied into the radiator fan switch....still not sure).

[revbjeff]

My new favorite thread.

[JumboBlack1.8]

For those of you that are interested in doing this swap in the near future, and are planning on running some 2.5" catless downpipes......PLEASE contact Greg@Griffin (Griffin Motorwerke) about the 2.5" Milltek Catless downpipe group buy......The special GB price is $649...which is an absolute STEAL, at Milltek downpipes generally go for over $2k. We're waiting on getting around 6 people....so please PLEASE get in touch with him if you're interested

*EDIT*

Here's the link:
http://www.audizine.com/forum/showth...P-s-for-A6-4.2