1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Agu amk difference

glen84wood Jun 16, 2014

  1. glen84wood

    glen84wood New Member

    Messages:
    19
    Likes Received:
    0
    Trophy Points:
    1
    What's the difference between the Agu n amk engines? I know the heads are different but what els?
    Thanks
     
  2. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    Some context would be useful but assuming bare engine as its for a swap then the AGU is large port (as you know), has different piston design and doesn't have VVT cam chain tensioner... sump doesn't have an oil sensor or provision for one IIRC (AMK does) but other than that they are physically the same..

    <tuffty/>
     
  3. glen84wood

    glen84wood New Member

    Messages:
    19
    Likes Received:
    0
    Trophy Points:
    1
    I'm planning on putting the Agu head on my amk is it a straight swap?
     
  4. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    Not exactly... AMK has VVT so you will need to swap the cam chain tensioner over, AMK exhaust springs have shims under them too... this from what I understand is to increase the preload of the exhaust springs as there is more back pressure on K04 turbo's angines than K03... the AGU head itself will bolt on fine of course... most AGU's will be high mileage too so if swapping the head I would get the guides checked and if need be replaced... typically exhaust guides wear... new stem seals too...

    Large port heads as a rule don't really help power until you start going for larger framed turbos and heading north of 350hp... small port heads are better on K04 setups as they increase low down torque and you don't really benefit much from the extra large port flow at the top end as K04's are done before 6k rpm...

    <tuffty/>
     
  5. Miguel_S#

    Miguel_S# Active Member

    Messages:
    333
    Likes Received:
    29
    Trophy Points:
    28
    So AEB our AGU only should be used in engines with top end after 7000rpm
     
  6. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    If your hardware setup is capable of making power at higher RPM then you will benefit from a large port head... so for example... if you have a small port head and a GT3071 then you will gain appreciable top power but loose a little bottom end torque by fitting a large port head... if you have a K04 hybrid then top end gains would be next to nothing but bottom end losses would arguably be more noticable...

    Point is... spec your engine to suit the turbo you are using and power you are after...

    <tuffty/>
     
  7. JimS3

    JimS3 Active Member

    Messages:
    736
    Likes Received:
    72
    Trophy Points:
    28
    Didn't know this, would it be best to add the shims under the exhaust springs when building up a large port head? There are no shims in the AEB head I am currently building, being a KO3.
     
  8. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    Depending what your plans are I would at least fit the shims but I'd also consider a set of cat cam exhaust springs..

    On a BT setup I'd just fit all supertech valve gear and be done... (in fact I like it so much I've done it twice!!! lol)

    <tuffty/>
     
  9. JimS3

    JimS3 Active Member

    Messages:
    736
    Likes Received:
    72
    Trophy Points:
    28
    I assume that's part 18? (06A 109 629 @ £1.07 each)

    [​IMG]
     
  10. glen84wood

    glen84wood New Member

    Messages:
    19
    Likes Received:
    0
    Trophy Points:
    1
    I'm doing a full forge upgrade n got advised to put the agu head on my amk as the amk bottom is stronger n the agu head is bigger as you are saying, I'm hoping to hit 400/500 I'm doing a full valve kit and rods piston kits
     
  11. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    Would have been useful to know that in the first place... in which case a largeport would be the best plan... context helps when trying to answer your questions :)

    AMK bottom end is essentially the same as the AGU, 20mm rods etc... if going for rods and pistions then the argument over which is stronger is irrelevant... I built my 2ltr stroker from a TT 180 block that had 19mm rods... the block is the block...

    The bare castings on the 20v turbos are interchangeable... the early AEB heads can have a raised section where the tensioner pulley goes which will need to be machined off

    For the power levels you want I would advise using a full supertech valve train including springs and retainers... use the single groove version as well

    <tuffty/>
     
  12. badger5

    badger5 www.badger5.co.uk Site Sponsor

    Messages:
    9,166
    Likes Received:
    1,790
    Trophy Points:
    113
    pick your head and port size to suit the power goal..
    now you've said a goal... easier to answer

    largeport ftw, but get it fully refurb'd
     
  13. glen84wood

    glen84wood New Member

    Messages:
    19
    Likes Received:
    0
    Trophy Points:
    1
    So rather than co binding the amk n agu should I just go straight to work on the agu n use that? If I can more than 4/500 horse I will n sorry ya right I should of said
     
  14. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

    Messages:
    20,318
    Likes Received:
    3,487
    Trophy Points:
    113
    If you are doing a full engine build (rebore, pistons, rods etc) then just rebuild the AGU... in the grand scheme of things its not going to make any difference but will allow you to continue using the car while you build the engine (assuming the car is currently drivable of course)

    As Bill said, get the head refurbed too..

    <tuffty/>
     
  15. scott_159

    scott_159 Member

    Messages:
    101
    Likes Received:
    13
    Trophy Points:
    18
    whilst on the subject of a large port head refurb whats the going costs for a refurb and any preferred people to use?

    assuming a general clean up with new stem seals and exhaust guide any rough costs?

    cheers
     
  16. glen84wood

    glen84wood New Member

    Messages:
    19
    Likes Received:
    0
    Trophy Points:
    1
    I think I'm punching above my weight with this but I'm hoping to learn and do it.

    The car is being used bit it don't matter if it comes off the road and it is going to be a full internal rebuild I'll use the Agu head as it's bigger but what about the rest of that engine? Is it worth putting the Agu head on the amk? I want it as string as possible.

    What involved in referbing the head it's getting sent off for skimming n pressure testing, is there more to it than that? If so what els?
     
  17. JimS3

    JimS3 Active Member

    Messages:
    736
    Likes Received:
    72
    Trophy Points:
    28
    Picked up a set of these exhaust spring shims earlier from TPS, they are really thin. Can't see them making much difference to the spring preload?
     
  18. Drue1

    Drue1 Member

    Messages:
    189
    Likes Received:
    23
    Trophy Points:
    18
    I've bought a complete AGU engine so I can build that up without being off the road
     
  19. badger5

    badger5 www.badger5.co.uk Site Sponsor

    Messages:
    9,166
    Likes Received:
    1,790
    Trophy Points:
    113
    and yet audi deemed they needed to fit them on all k04 cars
    exhaust back pressure is key, and ignored by many....... to their detriment

    hybrid territory = increased back pressure
     
  20. badger5

    badger5 www.badger5.co.uk Site Sponsor

    Messages:
    9,166
    Likes Received:
    1,790
    Trophy Points:
    113
    double post, WTF is up with this forum?????
     

Share This Page