IDI to DI Power Potential

[lord_verminaard]

I'm sorry for the dumb question but why can't you run 1.6 IDI turbo pistons with a DI head? If there is something about the crown shape that is undesirable can you machine them?

Basically DI engines have the combustion chamber in the piston.  IDI's have the combustion chamber (or pre-chamber) in the head.  Pics for reference:

TDI pistons- note the hollowed out part in the middle:



And IDI pistons- no chamber:




Brendan

[subsonic]

This is a link to the Kolbenschmidt automotive catalog home page.  There is a lot of information on dimensions.  I think you will be able to find the info there, if you don't get side tracked looking at all the other cool stuff :wink:

http://vwdiesel.net/phpBB/viewtopic.php?t=8128

[Helliouse]

libbybapa if you follow the link, it will take you to a pdf that has all the wrist pin dimensions as well.

[subsonic]

I don't know if this will help.  It took me a while to figure out how to read this stuff.

http://www.msi-motor-service.com/download/kolben/e/ko_benkat_en_WEB.pdf

[jimfoo]

I believe the compression height is what you are looking for. 41.7 mm for 1.6 vs 41.865 for the 1.2, so maybe they could work with .165mm shaved off. Not sure about the pin specs for the 1.2 though. Maybe the 28 is for the unbushed hole.

[Vanagoner]

It is inspiring that VW is still re-designing their engines based on what they started 30 years ago.  If these interchanges work, what a tribute to a great design- and unheard of on anything else (except BMW motorcycles, perhaps).

[subsonic]

Subsonic, thanks for the link.  Anyone know the engine code for the 1.2 TDI?  

Andrew

Closest one I could find under vw in the catalog was:

Polo 1.3D  1272cm3
08-1985  07-1990
Engine code MN
22:1
33kw
75x72
Posistion 13  Page915

That was the smallest dispacement Diesel I could find.

Any help?

[subsonic]

http://www.audiworld.com/news/99/a2_2/content.shtml
http://www.carfolio.com/specifications/models/car/?car=107426
http://www.a2oc.net/forum/archive/index.php/t-5379.html

Looks like it is engine code:

                   ANY

[Helliouse]

Price and part no. for piston in 1.3l
found at http://www.vagcat.com/epc/cat/vw/LU/1999/231/49/2941729/

BASIC GERMAN PRICELIST
part number 036107065AT
Partnumber Title Price
036107065AT KOLBEN 165.5 Euro

Sorry Libby, I though you ment the pin lenght etc, they didnt state the hight of the pin in the piston.

[rallydiesel]

Any updates? Homebrew 1.6 TDI would be awesome. If there are no pistons that will work, does a AAZ block fit into a Mk2 chassis easily?

So 165.5 Euros is $250 Canadian. Not too bad but shipping will suck and I have no idea if that includes rings, wrist pins, etc.

[Helliouse]

I think it includes rings and wrist pin, if i remember correctly.
But it still doesn't help me find where to buy the damn things. :-(

$700 ish for 1.6 stock pistions +300 for DI pistions...need them either way...

[rallydiesel]

The site says they are made by Kolbenschmidt and Alcan. I can't find them anywhere in the KS catalogue and Alcan was sold to Federal-Mogul and it appears they don't make them anymore.

 :?:

[rallydiesel]

Stock 1.6TD pistons are less than $300 from myke_w.

[Helliouse]

Well $300 makes a hell of a lot more sence.
Who makes them? Myke_W's i mean.

[jimfoo]

I'd say get in touch with one of the list members in the UK as they would probably have to get them from a dealer. Still no absolute proof they will work though.