1.5/1.6 Hybrid

[Zukiman87]

Anyone have a pic of a ported head?

[R.O.R-2.0]

Cool..  Have you read though the link I posted about swapping heads around? All the poop should be there about swapping the 1.5 head on that block..  You'll need to use the 1.5 rod bearings and head gasket, as well as the little adapter doo hickey.. Everything else should be pretty straight forward.. 

AS far as the injection pump, you have any plans on what you'll be using there yet? There are some slight differences between the 1.5 and 1.6 pumps..  Not sure exactly what, I think most of it is timing and governor.. (maybe Burn_Your_Money can chime in here) AS far as interchanging a 1.6 pump on a 1.5 and visa versa I've never really been able to tell much difference..  You can swap the top from a TD pump onto the 1.5 pump...

the difference wasnt the pumps, it was the injectors.. early 1.5 engines had like 180? bar injectors.. thats why they have a 1.15mm timing spec.

[R.O.R-2.0]

How about the prechambers?
 Difference between the 1.5 and 1.6 prechamber volumes that might effect compression?

if he uses the 1.5 rot. assy. and 1.5 head, in a 1.6 turbo block, its just going to be a stock, tough as hell 1.5D

myself personally i would just use a 12mm turbo head.. its not going to drop the comp much, if enough to notice it..

[R.O.R-2.0]

I read the link thanks. Good stuff in there. Anyone have a pic of a ported head?

I'm trying to make up a list for what I'll need to rebuild the bottom end while it's out. Don't want to screw anything up. As far as the top end goes head studs and the metal gasket are a given.

With injector pump I'll use the old one and put a turbo top on it. It's going to get tore down and a full rebuild anyways. Probably do the governor too.

Vnt-17 turbo and as big of an exhaust I can fit.

Should be good!

these 2 mods alone, are going to make this one hell of a fun, rev happy engine! its gonna be a blast! i know personally, ive been driving around a VNT equipped diesel for a while now (both 1.5 and 1.6 engines) and the truth be told, i like the power better out of the 1.5 alot better.. it really shines up on the top end! spools a tad bit sooner on the 1.6 tho..

[Mark(The Miser)UK]

the difference wasnt the pumps, it was the injectors.. early 1.5 engines had like 180? bar injectors.. thats why they have a 1.15mm timing spec.

That's interesting, where do you get the 180 bar figure from? The early pumps had a steeper dynamic curve, but I'd not noticed any bars other than 130, but that's not to say it didn't exist though

[Zukiman87]

So can anyone tell me the a specific year/model that I can find a vnt-17 on? See if I can find one from a junkyard instead of buying a brand new one.

[theman53]

Vnt came on most TDI cars. The VNT 1749vb is the one I want if I go that route and came on some AHU and BEW engine code TDIs

[8v-of-fury]

not 96 passat's, 97 or 98 Jetta's, or 98 golfs with TDI's. Just so you know what not to look for too lol. 99+ ALH motors are cherry

http://www.idparts.com/catalog/product_info.php?products_id=541

Just so you know what your looking for when you find em.

[R.O.R-2.0]

i got mine off an 01 ALH 110hp model. (GT17 vnt) the more common turbo is the GT15 vnt, off the 90hp engine..

[Mark(The Miser)UK]

the difference wasnt the pumps, it was the injectors.. early 1.5 engines had like 180? bar injectors.. thats why they have a 1.15mm timing spec.

That's interesting, where do you get the 180 bar figure from? The early pumps had a steeper dynamic curve, but I'd not noticed any bars other than 130, but that's not to say it didn't exist though

I've looked at some quite early documentation but still the 180bar eludes me. Perhaps you can suggest a source, or maybe the 8 was actually a 3....

[R.O.R-2.0]

no, i will find it. ive read somewhere that early 1.5 diesels with "yellow dot" pumps, have an unusually advanced timing spec because of the high breaking pressures. but i do not recall exact numbers at this time. i remember it being higher than the TD breaking pressure tho..

Giles Jr or Vincent would know for sure.

[8v-of-fury]

R.O.R-2.0:
i got mine off an 01 ALH 110hp model. (GT17 vnt) the more common turbo is the GT15 vnt, off the 90hp engine..

And that will still be a huge step over stock. Nothing wrong with a 15

[maxfax]

no, i will find it. ive read somewhere that early 1.5 diesels with "yellow dot" pumps, have an unusually advanced timing spec because of the high breaking pressures. but i do not recall exact numbers at this time. i remember it being higher than the TD breaking pressure tho..

Giles Jr or Vincent would know for sure.

I remember encountering this once upon a time myself..  I had one of the yellow dot pumps..  Couldn't get it to run right till I found out the dealy..  I don;t remember the specs either though..

[rabbitman]

no, i will find it. ive read somewhere that early 1.5 diesels with "yellow dot" pumps, have an unusually advanced timing spec because of the high breaking pressures. but i do not recall exact numbers at this time. i remember it being higher than the TD breaking pressure tho..

Giles Jr or Vincent would know for sure.

I think it was up in the 1.15mm range, the mk1 bentley has it.

[8v-of-fury]

Yes stock setting of 1.15mm so it'd probably run great timed to around 1.25mm I would think