Agu amk difference

[glen84wood]

What's the difference between the Agu n amk engines? I know the heads are different but what els?
Thanks

 

[<tuffty/>]

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/>

 

[glen84wood]

I'm planning on putting the Agu head on my amk is it a straight swap?

 

[<tuffty/>]

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/>

 

[Miguel_S#]

So AEB our AGU only should be used in engines with top end after 7000rpm

 

[<tuffty/>]

So AEB our AGU only should be used in engines with top end after 7000rpm

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/>

 

[JimS3]

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/>

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.

 

[<tuffty/>]

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/>

 

[JimS3]

I assume that's part 18? (06A 109 629 @ £1.07 each)

 

[glen84wood]

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

 

[<tuffty/>]

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

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/>

 

[badger5]

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

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

 

[glen84wood]

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

 

[<tuffty/>]

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

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/>

 

[scott_159]

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

 

[glen84wood]

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?

 

[JimS3]

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...
<tuffty/>

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?

 

[Drue1]

I've bought a complete AGU engine so I can build that up without being off the road

 

[badger5]

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?

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

 

[badger5]

double post, WTF is up with this forum?????