Injector holes close up views

[schulte]

For anyone interested, I have some very up close views of some of my injector nozzles. I have images of stock, "125% over", and "140% over" nozzles.

These images were produced with a scanning electron microscope at 7-2,000x magnification. The accelerating voltage was 10.0kV and the emission current was 0.102-0.104mA.

The material analysis was done using energy dispersive xray spectroscopy.

 

[schulte]

These are stock LLY injector nozzles from freshly remanufactured injectors. They were cleaned with solvents and compressed air.

50x magnification:

470x magnificatio (side view):

550x magnification:

2,000x magnification:

 

[schulte]

These are "125% over" modified OEM 7 hole injectors done by a well known vendor that uses abrasive flow machining (honing, not EDM). They were cleaned with solvents and compressed air.

They were brand new nozzles when they were honed, and have since had a little less than 40,000 miles put on them.

7x magnification:

100x magnification:

200x magnification:

450x magnification:

 

[schulte]

These are "140% over" modified Bosch Motorsports 8 hole injectors. They were cleaned with solvents and compressed air.

They were brand new nozzles when they were honed, and have since had less than 500 miles put on them.

47x magnification:

300x magnification:

450x magnification (side view):

1,000x magnification:

 

[schulte]

EDX results for all 3. The beam was aimed at the base of the tip, not the holes (was more interested in the material, not any contamination from fuel or combustion).

Stock:

"125% over":

"140% over":

 

[JoshH]

That's freakin' cool!

 

[Ne-max]

Bad ass.

 

[mechman3]

Must be nice to have an SEM as a tool to play with. Do you have an explanation for the potasium spike in the 125% nozzles?

 

[whiterock06]

That is sweet!!!


06 Crewcab long bed Lbz

 

[schulte]

Must be nice to have an SEM as a tool to play with. Do you have an explanation for the potasium spike in the 125% nozzles?

I'm almost positive it's from the solvent I used to remove the carbon deposits... commercial "Oven and grill cleaner" aka a combination of organic solvents and potassium hydroxide.

I cleaned the nozzles in aluminum pie tins because I didn't have any clean glass around and it will eat through pretty much any plastic, and the potassium hydroxide slowly reacts with aluminum...

3KOH + Al3+ -----> Al(OH)3 + 3K+

I wouldn't leave the nozzles in solvent in aluminum overnight, but for just a few minutes it doesn't eat through much.

This also explains the aluminum residue.

 

[schulte]

Must be nice to have an SEM as a tool to play with. Do you have an explanation for the potasium spike in the 125% nozzles?

Now, the real question is where did the magnesium come from in the 125% nozzle... I'm betting it's from some of one of the additives I've run. They use magnesium in diesel additives as a corrosion inhibitor and to prevent deposits from forming in the fuel system.

 

[Awenta]

That's awesome

Sent from my SM-N910V using Tapatalk

 

[mechman3]

It is definitely a fun tool. I used to use one for compressor blades for turbine aircraft engines

 

[bfmine]

Very cool. Thanks for sharing

 

[95 z71]

That's freakin' cool!

x2, thanks for the pics!

 

[malibu795]

Cool

 

[chevyburnout1]

Way slick!! I love stuff like this!

 

[NC-smokinlmm]

Thats cool, thanks for sharing.