A tuning tale: BLMs say lean, plugs say rich

[Ccmano]

Originally Posted by XfireZ51

Sent them off to Portland. One of the people from ThirdGen has a shop.

What do they charge if you don’t mind me asking?
H

[XfireZ51]

Originally Posted by Ccmano

What do they charge if you don’t mind me asking?
H

Not sure they do it commercially Hans.

[WARP TEN]

Originally Posted by XfireZ51

Sent them off to Portland. One of the people from ThirdGen has a shop.

Doesn't Marc Haibeck do flow and electrical testing of fuel injectors? If it is the same sort of testing, Hans, there are prices listed on his webpage http://www.zr1specialist.com/ for the work. --Bob

[XfireZ51]

Bob,

I must admit, I never even thought of that. Actually nver recall Marc discussing this. Good to know, however. Hope this helps someone else.

[XfireZ51]

I got back a report on the injectors. I would say the “while you’re there rule” holds quite valid.

The #7 secondary injector basically sprayed a stream of fuel. This is due to plastic aerator in tip breaking down in the center. Bottom line is that after 10+ years this set of Accels is junk. At least 5 of them need to be replaced, but I run the risk of the aerator failure occurring in the other injectors at some point.
I just did this on a whim. Not really expecting this because after all, Accels don’t really break down. In my case at least, they have.

Here’s the email I got on the results

“Hey - so I tested all the injectors yesterday. The flow rates don't seem to be an issue, and all the injectors "function". However - 4 of the primary injectors have very poor spray patterns, and one of the secondary injectors has no spray pattern at all - it just fires a steady single stream. What has happened to these injectors is the plastic aerators in the tip that divide the flow into three equal streams have begun to disintegrate. and in the case of cylinder 7's secondary injector the center of the aerator has broken out and is essentially missing (gone through the engine I assume). I don't think this type of failure is repairable, and in any case I wouldn't want such a design with a plastic aerator that can fall apart and end up down the cylinder. Here is a picture of the failed aerator tip on 7S. I have videos of them in action also just have to figure out how to share them. It is my opinion that these are junk and I would replace them with a newer design. If you wanted to run them at least 5 of them need to be replaced due to spray pattern which from the plastic aerators either entirely or partially failed. Obviously cleaning them would do not good - in fact it may make some of them worse if it dislodges more of the brittle plastic tips.”

Attached is a pic of #7 secondary injector. If u recall, #7 is where I experienced a cracked compression ring last year.

[Top Toy]

Whoa! That's scary! Explains a lot! Now begs the question re whether or not your new rings or the cylinder have been damaged by unburnt fuel washing the oil off the cylinder wall. Do new Accel's have the same plastic tips?

[XfireZ51]

Dennis,

Glad u jumped in. I was going to ask u what ur using?
Don’t have answer on new Accels. Maybe someone else has info.

[Top Toy]

Originally Posted by XfireZ51

Dennis,

Glad u jumped in. I was going to ask u what ur using?
Don’t have answer on new Accels. Maybe someone else has info.

I've had FIC's for about three years. No issues yet (knock on wood!). I know some others have had drivability issues, though, so they're not fool proof.

[XfireZ51]

So now the question is which injectors to replace them with. Aerator for Accel is plastic and breaks down.
The RC Engineering are very expensive at $80/iinjector. I need 16. Ouch!
FIC Delphi (New) $729/ set
Southbay sells rebuilt Multecs at $329/set
Accels are $580 for the set.
Bosch III are the narrow body and won’t fit.

Talk about cascading failure.

[XfireZ51]

Was FIC able to provide the Voltage Bias for their injectors?