Pictures of 1.9 8v head and injectors? - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 22-05-12 Thread Starter
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Pictures of 1.9 8v head and injectors?

Does anybody have pictures of how the injectors sit in the 8v head?

I'd like to see if the angle they sit at is about the same as for my engine. The original injectors on mine are tiny, the alfa ones seems a good upgrade, but I need to know the fittment angle on the injectors.

Anyone with pictures?
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I'll try to take a picture from the side, with one injector in.
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Originally Posted by yan.ko View Post
Attachment 143803

I'll try to take a picture from the side, with one injector in.
I'd appreciate that. What I need to be able to see is how the fork locks the injector body, and the angle it sits at.
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Right I went ahead and fitted the nozzles. The fork holds the injectors on the right side on the alfa head, and on the left side of the injector on the HDi head, meaning angle must be slightly off. But I'm quite impressed by these nozzles. AFR is lower now with same amount of fuel and bost (~17:1 at full throttle, 4.000 rpm, before ~15.5:1), meaning better combustion than before. (compared to the original nozzles). I can utillize higher revs now due to the much shorter durations, it can pull hard to nearly 5.000 without problems. Before it would start smoking at ~4.100 due to EOI being to late.

Only "problem" is that the turbo build boost slightly later due to the far better EOI, but that is only a matter of mapping. Turbo control in closed loop is better now, again due to better EOI.

Now let's see if I can reach 220BHp with these nozzles, I was at 206BHp before with ori nozzles.
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Sorry for my many questions, but..

With the new nozzles my turbo builds boost quite a bit later compared to before. Is this becuase of the EOI being much sooner compared to the original nozzles?

eg.
2.000 rpm
1000 bar railpressure
61mm^3
VNT: 94%

org EOI: 10,6 ATDC
new EOI: 4,72 ATDC

Does the EOI really make that big a difference to how the turbo builds boost?

That means I will have to retard injection a bit, since VNT cannot go any higher.
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yes, EOI influences EGT significantly
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Quote:
Originally Posted by yan.ko View Post
yes, EOI influences EGT significantly
Ok, then I have to retard the SOI a bit on it.

I have not worked with retarding SOI before, are there anything I need to consider before trying to retard SOI? (I suppose pilot injection also have to be retarted?)

on a sidenote: I managed to get the smokemap to use the values above 900 I saw 1341mg/r @ 2800 rpm, 2753 mbar, 91mg/r. Which corresponds with my AFR being meaured at 17.5:1
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Congratulation

Keep the delay between pilot and main injection the same.
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Quote:
Originally Posted by yan.ko View Post
Congratulation

Keep the delay between pilot and main injection the same.
Alright, I'll take a look at it then.

As for the VNT.. I have pretty high VNT DC at 2900 rpm 2753mbar. It's at 86%... It looks like I have to take a look at the actuator, and get that adjusted properly. Too bad it sits at the back of the engine below two manifolds
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