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  1. #1
    Registered Member One Ring MeanM's Avatar
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    A8 motor swap into s4

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    Hello all, so I bought an S4 with a crap motor, thereís no compression what so ever in the engine. I checked 3 out of the 8 cylinders and had nothing. Stopped after that. So Iíve been looking into a motor, and thought to myself well whatís the different with the A8 motor or the Audi A6 with the 4.2? Any insight on if the A8 motor would work? I searched forums and didnít see anything pop up or at least not anything Iíve seen with this being asked. Please let me know if anyone has done this or has knowledge on this.

    Thanks...

  2. #2
    Veteran Member Four Rings Audibot's Avatar
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    The A8 engine is a belt-driven engine vs chain-driven. So it has a changeable timing belt vs a timing chain that the S4 has. I cannot comment on compatibility, whether it could be dropped in and would be plug and play or not.

  3. #3
    Active Member Two Rings
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    The belt driven 4.2s are longer, and won't fit directly in, due to the fact that the timing stuff is all up front. You'll have to pull the engine either way, so I'd at least try to get a better idea of what exactly is wrong with the engine. Finish the compression test - maybe just one bank is bad, i.e. a bad head gasket. If you really end up needing a new engine, definitely better just to wait for one out of the same model year S4. People are always parting them out, so you just have to be patient.

  4. #4
    Senior Member Four Rings VinnysS4's Avatar
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    If you're going to do a swap, just buy a 2.7 from a B5 s4. They make kits for such thing. Instead of pioneering something that isn't common and wasting a bunch of money, save your cash and invest it on something a bit more proven.

    Sent from my SAMSUNG-SM-N900A using Audizine mobile app
    1997 VW GTI VR6 (sold), 2003 Audi RS6 (sold), 2010 Audi A4 2.0T (RIP Totaled on 11/2/2015 ) 2005.5 Audi S4

    http://www.audizine.com/forum/showth...-s-s4-timeline

  5. #5
    Established Member Two Rings
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    Quote Originally Posted by samgrylls View Post
    The belt driven 4.2s are longer, and won't fit directly in, due to the fact that the timing stuff is all up front. You'll have to pull the engine either way, so I'd at least try to get a better idea of what exactly is wrong with the engine. Finish the compression test - maybe just one bank is bad, i.e. a bad head gasket. If you really end up needing a new engine, definitely better just to wait for one out of the same model year S4. People are always parting them out, so you just have to be patient.

    exactly!! Belt driven older 4.2 engines are longer, won't work.. There are tons of engine online for sale... Just make this the time to learn the engine and take it out of the car yourself and break it down... maybe rebuild it on your own.. Believe me, there is enough information on here for you to successfully remove the engine on your own
    Audi S4 Avant track project.

  6. #6
    Veteran Member Four Rings Nollywood's Avatar
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    Quote Originally Posted by Jdsb6s4 View Post
    exactly!! Belt driven older 4.2 engines are longer, won't work.. There are tons of engine online for sale... Just make this the time to learn the engine and take it out of the car yourself and break it down... maybe rebuild it on your own.. Believe me, there is enough information on here for you to successfully remove the engine on your own
    The 077-series (belt-driven) motor does fit the B6 chassis.
    2003 Audi B6 A4 Quattro Sport Avant, 3.0 | 6-Speed Manual Swap | BOSE | Rear PDC | Factory Votex Kit | OEM B6 S4 Black Optic Grille | Rear Tints | Black Leather | Cruise | H&R Spacers 12/15mm Front / Rear | B7 S4 OEM Alloys

    B6 420-TS Avant - RS6 4.2 BiTurbo, (BCY). B6/7 Hybrid "RS4" OEM Widebody Coming Soon.

  7. #7
    Veteran Member Four Rings Nollywood's Avatar
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    Quote Originally Posted by VinnysS4 View Post
    If you're going to do a swap, just buy a 2.7 from a B5 s4. They make kits for such thing. Instead of pioneering something that isn't common and wasting a bunch of money, save your cash and invest it on something a bit more proven.
    Yes itís not common, because too many folk think the same way you do - which is wrong. Yes, the 2.7T swap into the 8E chassis is proven, but only because someone (Clint?) did the swap, and subsequently helped others achieve the same. Until Clint did this, the 2.7T swap was uncommon, too.

    Swapping a 4.2 V8 40V (078-series) into a B6 is a waste of money? Iím not sure I follow this. Pumping money into the 089-series, chain-driven motor, which is probably one of Audiís worst modern engines isnít a waste?
    Last edited by Nollywood; 02-14-2018 at 01:15 AM.
    2003 Audi B6 A4 Quattro Sport Avant, 3.0 | 6-Speed Manual Swap | BOSE | Rear PDC | Factory Votex Kit | OEM B6 S4 Black Optic Grille | Rear Tints | Black Leather | Cruise | H&R Spacers 12/15mm Front / Rear | B7 S4 OEM Alloys

    B6 420-TS Avant - RS6 4.2 BiTurbo, (BCY). B6/7 Hybrid "RS4" OEM Widebody Coming Soon.

  8. #8
    Veteran Member Four Rings Nollywood's Avatar
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    Also...

    I think weíre all making assumptions here, that Audibot is referring to the belt-driven V8.

    A8 D2 4.2 V8 40V - 077-series (1999-2002).
    A8 D3 4.2 V8 40V - 077-series (2003-2005).
    A8 D3 4.2 V8 32V - 079-series (2005-2009).

    A6 C5 4.2 V8 40V - 077-series (1999-2003).*
    A6 C6 4.2 V8 32V - 079-series (2005-2008).

    *2005 C5 Allroad
    2003 Audi B6 A4 Quattro Sport Avant, 3.0 | 6-Speed Manual Swap | BOSE | Rear PDC | Factory Votex Kit | OEM B6 S4 Black Optic Grille | Rear Tints | Black Leather | Cruise | H&R Spacers 12/15mm Front / Rear | B7 S4 OEM Alloys

    B6 420-TS Avant - RS6 4.2 BiTurbo, (BCY). B6/7 Hybrid "RS4" OEM Widebody Coming Soon.

  9. #9
    Senior Member Three Rings
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    By the way Nolly, any updates on your 077 installation project?

  10. #10
    Veteran Member Four Rings q_dubz's Avatar
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    so just swap in some new valves or hell even used valves and do a lap job.
    Boost EVERYTHING!
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  11. #11
    Senior Member Four Rings VinnysS4's Avatar
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    Quote Originally Posted by Nollywood View Post
    Yes itís not common, because too many folk think the same way you do - which is wrong. Yes, the 2.7T swap into the 8E chassis is proven, but only because someone (Clint?) did the swap, and subsequently helped others achieve the same. Until Clint did this, the 2.7T swap was uncommon, too.

    Swapping a 4.2 V8 40V (078-series) into a B6 is a waste of money? Iím not sure I follow this. Pumping money into the 089-series, chain-driven motor, which is probably one of Audiís worst modern engines isnít a waste?
    Think the way I do? Lol atleast it sounds good.

    I have a lot of respect for you nolly, I'm surprised the comment... either way. Personally I would rather say " suck it up buttercup and just do the work yourself, replace the valves and call it a day." Besides, it's not THAT hard to disassemble these engines. I have seen somewhere a company that makes a swap kit for the 2.7 . Never seen one for the motor you speak of. Can it be done? Sure. You've done it right?
    The OP is in charge of his own pocket book, so by all means, swap away. I'm sure it could be done on the cheap if need be. Besides, he probably got a great deal on the car as-is. I'm sure a custom harness could be made as I'm sure it isn't plug and play. That or the ecu could be adapted to the car as I'm not sure the S4 ECU would work on another engine. A stand alone management system could always be used, but now we're talking about throwing money away.
    If OP has the knowledge, time, money, and tools along with a place to do the swap, then get on with it. I just personally would rather drop in a stage 3 2.7 setup after rebuilding my car. In the end, the NA 4.2 S4 engine (or the one from the A6 etc) just doesn't make enough power for me to justify dumping much money into it. Yeah, headers and some lightweight rotating parts would be nice, but the power wouldn't justify the cost.
    Quote Originally Posted by Nollywood View Post
    Yes itís not common, because too many folk think the same way you do - which is wrong. Yes, the 2.7T swap into the 8E chassis is proven, but only because someone (Clint?) did the swap, and subsequently helped others achieve the same. Until Clint did this, the 2.7T swap was uncommon, too.

    Swapping a 4.2 V8 40V (078-series) into a B6 is a waste of money? Iím not sure I follow this. Pumping money into the 089-series, chain-driven motor, which is probably one of Audiís worst modern engines isnít a waste?

    Sent from my SAMSUNG-SM-N900A using Audizine mobile app
    1997 VW GTI VR6 (sold), 2003 Audi RS6 (sold), 2010 Audi A4 2.0T (RIP Totaled on 11/2/2015 ) 2005.5 Audi S4

    http://www.audizine.com/forum/showth...-s-s4-timeline

  12. #12
    Senior Member Four Rings VinnysS4's Avatar
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    Anything can be swapped if you put your mind to it. Just depends on the future plans for the car I guess!

    Sent from my SAMSUNG-SM-N900A using Audizine mobile app
    1997 VW GTI VR6 (sold), 2003 Audi RS6 (sold), 2010 Audi A4 2.0T (RIP Totaled on 11/2/2015 ) 2005.5 Audi S4

    http://www.audizine.com/forum/showth...-s-s4-timeline

  13. #13
    Veteran Member Four Rings Nollywood's Avatar
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    Vinny, I apologise. I didnít intend to come across as rude. Itís just that Iím so passionate about technical innovation, regardless of the ďbang-for-buckĒ aspect.

    Every swap is expensive initially. As they get more refined and perfected, the cost comes down too. Then people find ways to get more out of these swaps, making them really viable.

    Iím sure the 2.7T swap into the 8E chassis was not cheap, nor easy in the ďBetaĒ stages. Now they can be performed by an average home mechanic, with not so specialist tools too.

    Thatís how technical innovation and advancement goes.
    Last edited by Nollywood; 02-15-2018 at 04:09 AM.
    2003 Audi B6 A4 Quattro Sport Avant, 3.0 | 6-Speed Manual Swap | BOSE | Rear PDC | Factory Votex Kit | OEM B6 S4 Black Optic Grille | Rear Tints | Black Leather | Cruise | H&R Spacers 12/15mm Front / Rear | B7 S4 OEM Alloys

    B6 420-TS Avant - RS6 4.2 BiTurbo, (BCY). B6/7 Hybrid "RS4" OEM Widebody Coming Soon.



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