ABY / AAN Engine Differences

[Rusty]

(Ignoring the bolt-on inlet parts & PAS pump)

EDIT:- What are the differences, if any between the same age ABY and AAN block and head?

Can an AAN block / head be used in an ABY application? I am looking a the cost of sourcing a spare engine to give me one to build up.

Similarities:-

Block and head:-

• Block
• Rods - 027198401C (1 set: connecting rods)
• Pistons - 034107065M (piston complete 81,00)
• Crank
• Head
• Cams

Ancillaries:-

• EM
• Turbo oil & coolant lines
• Turbo
• Oil pump
• Water pump
• Crank sprocket
• Cambelt
• Cambelt tensioner
• Relay roller
• Cambelt covers

Differences:-

Block and Head:-

• Front pulley (can this be swapped for an ABY? Bolt-on?)
• Slightly different rocker cover (Breather pipe exit, bolt-on)
• Flywheel (bolt-on).
• ...

Ancillaries:-

• Vibration damper & pulley
• Sump
• Engine mounts
• Thermostat housing/oulet
• Water rail
• Inlet manifold
• Fuel rail
• Fhrottle body
• PCV plumbing
• ISV plumbing
• Cam cover
• Turbo heat shields
• Dipstick tube

[Error404]

http://www.s2forum.com/forum/showthread.php?t=31760

I am doing exactly this right now Andy, using a 1995 AAN engine with ABY ancilliaries
Basically the block, head and internals I believe are identical.

I believe i have now go a definitive list of ancilliary differences, I'll dig it out.
But you could take everything off your ABY and bolt it onto an AAN.

[Rusty]

Sweet, that makes things a bit easier then

[Error404]

In fact, besides the block, head & internals most things are different!
The only ancillary things that are the same are I believe:

EM
Turbo oil & coolant lines
Turbo
Oil pump
Water pump
Crank sprocket
Cambelt
Cambelt tensioner
Relay roller
Cambelt covers

[djh]

Flywheel is also different

[Rusty]

Flywheel is also different

Added to the original post

[Error404]

More differences:

vibration damper & pulley
sump
engine mounts
thermostat housing/oulet
water rail
inlet manifold
fuel rail
throttle body
PCV plumbing
ISV plumbing
cam cover
turbo heat shields

[Tonks4x4]

Dipstick Tube

[Rusty]

I was only really interested in the fundamental metal parts. Bolt on parts aren't an issue, as I have an ABY with all the bits I need on it...

That said, we can start to expand the scope of this thread to become an all-encompassing affair and bring in the ADU if needs be. Might be quite a nice pooling of resource in 1 place.

[Nuvo]

Are you aware of this the info posted on this thread Andy?

[Rusty]

Are you aware of this the info posted on this thread Andy?

no, missed that one

Cheers

[Nuvo]

Whoopsie.

[UrS4boy]

Are you aware of this the info posted on this thread Andy?

I was wondering why he hadn't referenced my post at the beginning.

[Greg_S]

Andy,

When I rebuilt my engine back in 2003 I purchased an AAN short block which was a direct replacement for the original. Main difference on one I had was that it had a different flywheel there were some other ancillaries I swapped from original block but all fitted up fine.

[Pirvu Eugen]

The AAN block has some small differences oposed to ABY.
The pas pump bracket bolts....the aan block has some threaded holes in plus there.
And the important think wich i miss now is: the threaded holes for the AAN snub mount, wich is in the lower right hand part of the block.
Iff i had that i could build another style front to receive front mounted radiators in my sport replica.
Hope this helps!