UrS4 2.2T Avant project

[quattro-nick]

What can cause so high injector duty? Bad engine blowby? Or is it high? I have no experience with these kind of things...

I also had this problem in the past so I have set my fuel pressure higher and problem was solved (i'm using a adjustable fuel pressure regulator)
here is a picture where i measure the fuel pressure on AAN fuel rail

[Thuppu]

Well, I don't have any electronic fuel pressure monitoring, only an mechanical gauge on the FPR to check the base pressure. And I use 4bar base pressure. But I could fit a second mechanical gauge outside the window to see how the pressure acts at boost.

[Tille]

From my experience:
S2 2.5l 908PS E85 1980ccm Injectors 100% DC
S2 2.2l 780ps E85 1980ccm Injektors 90% DC

So its ok i think

[Thuppu]

Ok, thanks!

[mushasho!]

I also had this problem in the past so I have set my fuel pressure higher and problem was solved (i'm using a adjustable fuel pressure regulator)
here is a picture where i measure the fuel pressure on AAN fuel rail

Where'd you get that banjo bolt?



I had to make my own bolt with 1/8 NPT thread...

[quattro-nick]

Where'd you get that banjo bolt?



I had to make my own bolt with 1/8 NPT thread...

my father had a some used banjo bolts so therefore i do not know exactly where it comes from

[Thuppu]

Back to old good times... or not. I did take apart the old block with forged internals that have been lying in the garage for a couple of years. This engine had the big oil burning issue, and in the end it started to keep some noise. This was found in cyl no 2.

[V6quattro]

[K Simmonds]

Wow, that came from an engine that was still running!??! It would certainly explain the noise.

[Dima ABY]

Wow!!!
Looks like this engine has not worked a lot.Pistons are shining.
Sorry for that.

[AndyP]

Dam, that sure took a pounding!!

[prj]

I wonder WTF happened.

Regarding hot running on AAN it is always Cyl 3 that is the hottest, followed by Cyl 4 and only then comes Cyl 2.

[igor136]

Did you have measure clearance between the pin and the rod bearing before?

[Thuppu]

The main issue was that the engine burned oil... really much oil... I mean a ton of it... I mean worse than a TFSI. I think that lead to e85 pre-ignition and high cylinder pessure, caused burnt spark plug electrodes, burnt valves, propably lifted head becase of this and in the end hammered the piston pin. This is just my theory.

[prj]

Preignition usually just silently melts the piston, rather than lift head, destroy pin etc.
Also, in that case it would be cyl 3 or cyl 4, they are much hotter than cyl 2.

Something else is amiss.