A2 tdi

[gropar]

I read more and more about tdi engines running fine -- or not -- on 1.9 idi pumps.

Since injection problems arise on my 1.9 idi (pump leaks, injectors seem not to be in the greater shape), I tough of getting rit of that AAZ and go to tdi...

I have read about tdi engine + idi pump + turbo from 1.6 or 1.9 idi working just fine.

I have also read that it might not be that true, that 1.9 idi pump has too small a plunger.

For all I know, to by a tdi engine, rebuilt my pump, use a spare 1.6td turbo I have and sell 1.9 iudi engine with working 1.6td pump would cost about the same as a rebuilt for the pump and new injectors... (knowing that the aaz engines are pretty expensive).

All of this got me thinking... I would like to know what you think about this. :?:

[Dr. Diesel]

where are you located?

[QuickTD]

A TDI will run with a 1.9 IDI pump, but poorly. The biggest problem is the camplate profile. IDI engines usually deliver their fuel within 35-45º crankshaft. A DI engine needs to get the fuel into the combustion chamber much faster, within 25-35º to ensure a complete burn. The TDI rotor is also slightly larger to help with this. If the camplate, head and rotor are fitted to an IDI pump body the shaft fails pretty quickly. The DI pumps have a 20mm shaft vs. the IDI's 17mm.

To make a proper mechanical TDI pump you need a DI pump body (4bt cummins?), the head, rotor and camplate from a TDI and the governor springs from a 1.6 or 1.9TD.

[QuickTD]

I'm also interested in your old engine if you choose to go with the TDI...

[gropar]

A TDI will run with a 1.9 IDI pump, but poorly. The biggest problem is the camplate profile. IDI engines usually deliver their fuel within 35-45º crankshaft. A DI engine needs to get the fuel into the combustion chamber much faster, within 25-35º to ensure a complete burn. The TDI rotor is also slightly larger to help with this. If the camplate, head and rotor are fitted to an IDI pump body the shaft fails pretty quickly. The DI pumps have a 20mm shaft vs. the IDI's 17mm.

To make a proper mechanical TDI pump you need a DI pump body (4bt cummins?), the head, rotor and camplate from a TDI and the governor springs from a 1.6 or 1.9TD.

You should not have said that if you wanted get my AAZ  :wink:

You can count on me not to go through all that trouble (intersting project, but out of range for me).

I guess I'll go for a rebuilt of my pump and new injectors.

Question : can an 1.6td pump be rebuilt with 1.9td specs? (would save me the trouble to find a spare ride for a week or so)

[QuickTD]

You should not have said that if you wanted get my AAZ  

What do you mean? I just spelled it out for you. It isn't difficult, it just involves gathering the needed parts. Why not go with the electronics? The wiring isn't that bad.

Where is your 1.9 pump leaking? Most leaks can be repaired without a "rebuild".

A 1.6 pump could be converted to 1.9 spec but it would involve changing a lot of expensive parts. Likely not worth it. A rebuilt pump can be had from the dealer for around $800, probably less than the conversion. You could bolt the 1.6 pump on to get you around for the week and then swap them back after you get yours rebuilt...

[gropar]

You should not have said that if you wanted get my AAZ  

What do you mean? I just spelled it out for you. It isn't difficult, it just involves gathering the needed parts. Why not go with the electronics? The wiring isn't that bad.

I know you did! As far as car mechanics is concerned, I try to keep things simple since I don't know a lot and have no proper installation to work.

As for the electronics, I know that a lot of mecanics won't  do it. Also, I am adict of left foot breaking, wich, I have heard, is not quite possible with the electronic pump... Plus, one again, all the trouble wich I am not shure I could pull through.

Which means I do not think I will do it and keep my engine.

Where is your 1.9 pump leaking? Most leaks can be repaired without a "rebuild".

That's what I though when I went to the shop and asked for a change of seals (no rebuilt, no warranty). Since I got it, cold start lever wil not stay out of dashboard (pulls in as soon as I stop pulling on it), and now it leaks again... I think this time I will ask for the rebuilt.

A 1.6 pump could be converted to 1.9 spec but it would involve changing a lot of expensive parts. Likely not worth it. A rebuilt pump can be had from the dealer for around $800, probably less than the conversion. You could bolt the 1.6 pump on to get you around for the week and then swap them back after you get yours rebuilt...

You are abslutely right about using the 1.6td pump for a few days...
It is quite possible that injectors are fine and that problems (smoky idle and misses when engine cold, poor mileage, etc) are caused by insuficient pump pressure.

Thaks alot.