is a z1 m-tdi

[745 turbogreasel]

You're both right...28 is a weight rating, like a 3500 pickup being a 1 ton, so LT28 had 4,5, and 6  cyl diesels by VW and Perkins in some early ones.
5 and 6 cyl pumps spin the other way, so using the guts may take  more work.

[libbydiesel]

I wasn't attempting to outline the various engines that were used in the LT28.  There were also gasoline engines installed in the LT28 and those weren't stock mTDIs either...  I was merely saying that there WAS a stock mechanical TDI engine produced by VW that was a 2.8L Inline-4 TDI and the pump for that engine is a straight bolt-on mechanical pump for the AHU.

[vanbcguy]

Advanced Automation sells the LT2.8 pump if anyone wants to go see a picture of a fully mechanical TDI 4 cylinder pump.

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[libbydiesel]

Here's their pic.  Notice the correct sprocket offset, slotted mounting holes for timing adjustment, correct diameter snout, proper deep dynamic advance cap, short delivery valves, and only four of them.

[CRSMP5]

uk guy has rover pump for conversions.. lucas knows how to reach him.. but $500 shipped to door.. almost bolts on.. needs machine work, but no popping pump open which is where most fail..

he also has tdi swap.. from a mk3 tdi swap for sale.. i have a b4 set up for sale.. rather see it put in a b3 though as its go tnew rad/ac and all that crap works.. so b3 wagon swap to keep all goodies..

[theman53]

my way of reaching the UK guy is to get ahold of CRSMP5 and tell him to get ahold of me

[snakemaster]

LT 2.8 is a  mercedes engine (motor)  on what info i have found out , all the LT 2.5 tdi and sdi (vw engine) have the mercedes gear box
I have a few LR tdi injection pumps all std and would sell and ship to the US etc if needed if any one is intersted

[fatmobile]

 I saw someone type their love for the 1z, saying it was more reliable and simple.
 Seems like a good place to ask how everyone thinks it compares to the AHU, even the ALH.
 Soo if I was going to build an mTDI how does the 1z compare?

[Diesel_Zuk]

I'm picking up a z1 and an ahu this weekend. one of them is going in this gti shell.
http://www.vwdiesel.net/forum/index.php?topic=34378.0
I'm completely new to tdi's and was hoping the z1 pump was a m pump. I kind of figured it wasn't but it was worth asking. i'll just have to convert one, I know where I can get a 1.9 pump and I have several 1.6 pumps so I should be able to put something together. just wishful thinking and blind hope to think it might have already been done I guess.

I don't think VW ever sold a turbocharged, direct injected diesel engine without electronic engine controls.

I have an lt28 pump on my ahu. It runs great! Only problem is, the idle is slightly funky. I have not tuned it yet though.

[vanbcguy]

The 1z is virtually identical to the AHU except for one important difference - the stock 1z pistons are a weaker design and can have some issues. If you are building an engine and plan on replacing pistons then a 1z and an AHU are totally the same.

They do use a slightly different injection pump too, but the difference is just some ribs on the pump case (you can say "that's a 1z injection pump and that one is an AHU pump" if you see them side by side but they perform identically)

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[fatmobile]

So the AHU pistons fit in a 1z and are concidered a common upgrade when rebuilding a 1z?

[burn_your_money]

I thought there was a difference in the head as well?

[bbob203]

1z had 7mm valves I think.

[vanbcguy]

Piston wise yes, the AHU pistons are an upgrade and fit perfectly. Actually all of the 1.9 TDI pistons will fit.

There are better pistons available than the AHU ones btw. The later pistons have an oil chamber that is fed by the piston squirters. It sloshes oil along the bottom of the crown providing significantly better cooling.

These for instance:

http://shopping.boraparts.com/product_info.php?products_id=410

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