differences between the A4 1.8 and TT engines

**ghost6303** · 01-13-2009 04:09 PM

so my friend has been looking for an Audi TT for a while and he came across one on craigslist with a blown engine. he asked me if my spare 1.8t engine for my 98 A4 would easily fit in that TT. i didnt know the answer so im posting it here, im sure one of you guys knows.

obviously the engine mounting is different, so you would need an intake mani from the transverse engine, and exhaust mani probably. what else? ecu? harness? how would the transmission work (assuming both are manual trans. and both quattro)? thanks guys.

**speedydragon** · 01-13-2009 04:42 PM

al lI know is that, the tt quattro is haldex, so the car is mainly a fwd until something slips.

**SykoraA4** · 01-13-2009 04:45 PM

yeah the transmission wont work...

**ghost6303** · 01-13-2009 05:37 PM

the transmission in the TT is fine, my question is would an AEB block bolt up to it? obviously an A4 transmission wouldnt fit in a transverse engine mounted car.

**Siena** · 01-13-2009 06:15 PM

The block would physically bolt up to the TT transmission, yes, using the TT flywheel and clutch.

All ancillaries, including mounts, both manifolds, oil filter housing, timing belt cover, oil pan and oil pick-up, alternator, PAS / aircon pumps and brackets etc.

Of course, the TT injectors would have to be retained; it'll run, but won't make the original TT's power - camshaft profiles are different on 210 / 225PS engines, and the CR is lower too than the AEB's.

To be honest, your friend's best off sourcing another TT motor, otherwise he'll have a second blown engine - with the AEB's higher CR, there's a risk of melted pistons, unless your buddy's looking to reduce the original boost settings, or change the pistons.

Out of interest, what's the story with the original TT engine?

I know you say it's blown, but what are we talking?

Unless it's spun bearings, damaging the block, dropped a valve and gouged a cylinder, or worse a rod has punched through the cylinder block, it's best to rebuild.

**ghost6303** · 01-14-2009 12:20 AM

yea theres a window in the block. #2 piston. it was just an idea, i didnt know how much would be involved. thanks for the info thats what i wanted to know.

**bikerbob951** · 01-14-2009 09:38 AM

if I'm not mistaken, the TT is a transverse mounted engine, A4 is longitudinal. Hook-up will be difficult, and plumbing will be pretty tough too. Will the mounts line up?

**317ssayzarc** · 01-14-2009 09:57 AM

Originally Posted by SykoraA4

yeah the transmission wont work...

Wrong...

Originally Posted by bikerbob951

if I'm not mistaken, the TT is a transverse mounted engine, A4 is longitudinal. Hook-up will be difficult, and plumbing will be pretty tough too. Will the mounts line up?

Wrong, you use TT accessories, but if the blocks are the same (01' and up A4) then everything bolts right up...

Now to the OP, the 98' A4 block is the 058 style block, that is not compatible with the TT, since the TT is the newer style 06A block. Even though it will bolt up, its not the right block for the car