AAB/T4/2.4L/2.5L 5 cylinder diesel engine TDI conversion

[itjstagame]

Hello all,

I have been looking for a while to try to find a European 5Cylinder TDI head. I know there were TDI engines based on the 2.4L Turbo diesel AAB or T4 engine code used in Eurovans in Canada (but never imported to US) but only had indirect injection. Late in the life of the engine Audi created a TDI head for this block that was European only. I was looking at first for a Canadian T4 and then was going to find a head, but I realize that any of the 5 cylinder's can have this head installed.

My stock engine is a 2.2L NA 5 Cylinder and I have bought an MC1 (2.2L Turbo 5 Cylinder) to stick in it. I've seen many performance ideas calling for the T4 block (2.4L or 2.5L) mounted with an MC2 head (second generation 5 Cylinder turbo) as a way to stroke it and get a little more volume (all Audi 5 cylinders had the same size bore).

So I've been thinking, except for maybe worries about different pistons or crankshafts that may not be strengthened enough (but should be on the MC1 already), I should be able to install the TDI head and it's fuel management and can probably even plumb it up to my MC1 turbo (a K26), I don't know what the turbo on the T4's was.

I figure someone has to have had the same dream of upgrading their old diesel to TDI and may have some insights.

Thank you!

[itzdshtz]

It is not that simple, there are no mounting bosses on the NF or MC blocks to mount your injection pump.
The TDI uses pistons that are designed to be used with the 95.5 mm stroke crankshaft and I don't think that this crankshaft has enough room to rotate in the NF or MC block.
If you use the 86.4 stroke MC crank with the TDI pistons, they will not reach the top of the bore, so your compression ratio will be way to low to even make it run.
IMHO stick with a 2.4 D and turbo it or get a 2.0TD.

[scopefrfd]

I have a 5 cyl tdi intake manifold if you're interested...it's here in the states