Ok men, I have a question if you can imagine. I've been wanting a little upgrade as far as injectors go because my truck smokes a lot and even with the 14cm housing, i still have some lag. (more than i want ) I got to thinking today.. I have decent sized stock injectors already... theyve just got a lot of miles on them. Would it be worth getting some EDM nozzles for them to make the fuel atomize better etc... to give me a more complete burn and add more performance? Or is this a waste of time? Pros and cons?
Thanks

 

I think the nozzels get worn as well as the springs get weak so the pop pressure gets lowered and uneven. New nozzels won't fix the problem of the springs but I'm sure they could and should be recalibrated when the nozzels are replaced. As far as EDM nozzels go I have read conflicting reports. I can't see why they would be any better than other methods of producing the holes. EDM stands for electro discharge machining and is a much slower method of producing holes than simply drilling them. The advantages of EDM is that odd shapes can be produced where a drill or rotating cutter cannot go. If some shape, a star for example were used instead of a simple round hole then the star shape may atomize the fuel better.

I have no idea whether this better atomization will improve things however since if the fuel is ignited even a little bit the resulting flame should burn the rest of the fuel as long as enough oxygen is present.

Bear in mind also that I am not a diesel engineer but I AM a machinist and an electronic engineer. My opinion on injectors is simply from what I've read here and my own common sense. I'm sure others will correct me.

Edwin

 

Thanks for the info!... Maybe I should spend some money and time on some POP testing and see where that gets me. Now i just have to find a shop out here in central kansas to do it for me
Thanks, keep em comin!

 

I'm in the same boat in Coffeyville. I have to go to Tulsa for lots of things. I've got 166K on my injectors so I'm sure I need the same service. Mine misses a bit when it's cold sometimes but otherwise it runs fine.

Let us know what you find up there and if the injector service helps your situation.

Edwin

 

from what i've read on this site, EDM's usually have 6 holes instead of 5, so they have smaller holes for the same flow... which in turn atomizes the fuel better. You might have to be careful what you get when you buy it.

 

most diesel shops will POP test for free, There are several local shops to me (since I am only 50 miles from a metro area), but... there's gotta be some near or in Salina. It is EZ to build a pop tester from a HYD jack, and a $5 gauge from Surplus Center (Lincoln, NE, sorry, its not lincoln Ks. ...)

several sites in internet will coach you how.

I'll help you make one when I get moved to denmark, ks. My favorite little 'get-away' , but it won't be till next june... gotta graduate. (antique student )

 

Well I found a couple places here in salina. The best is Diesel Equipment Specialists, Inc. The guy was really friendly and he said he'll POP test for free. He quoted me about 55 dollars a piece for new nozzles and adjusting the springs etc.. Thats if I take just the injectors to him of course. He also gave me a little demonstration on how to change the gov spring He had the same pump on his workbench and was working on it so that was nice! He also deals Bosch parts!

phone number is 785-825-6753 if youre in the area and interested.

Looks like I will be going this route.

 

Slight hi-jack, but: My understanding is that the reason EDM is used for aftermarket injector production is that the holes are machined after the tips are through-hardened.

 

Good idea on the re-pop and cleaning.

Have them set to pop at 275 bar.

 

for that price I would get myself a set of POD's off ebay. Keep in mind, you are getting new stock nozzles, not EDM'd nozzles for that price. Nothing wrong with your old tips/nozzzzles I imagine, so I'd save my money.

Dave, 275 bar?? Gonna kill his lil ole VE, make it work hard. Decent read on pop pressure, with bar/psi calculator: http://www.turbodieselregister.com/f...&highlight=pop. I forgot the magic number, Pastor Bob might chime in or I could search for some of my old threads. I had my EDM's set to stock pop pressure so to keep my big rotor head intact.

 

He said he wanted good atomization.

I think 260 is a more reasonable number.

 

I would imagine that after 300,000+ miles that my nozzles could need replaced. I'm willing to pay a few hundred dolars for rebuild. (Remember I have the big stock injectors vs. the small ones on the intercooled pickups.) He also said that he could give me bigger nozzles. But I don't want to lose fuel mileage unless its because I cant keep my foot out of the pedal . What do you guys think about getting the bigger nozzles? Will i lose fuel mileage and just get more smoke with small benefits? Pros and Cons?
Thanks!

 

Lucas POD's. These would be an upgrade, bigger nozzles to boot. Also as there isn't such a thing available for your 9mm nozzles in stock form.

 

'Wanna you whacked out diesel head.........

I don't recommend going to 275 bar for the majority of guys. That pushes the IP to the hard edge of 'Uh Oh.."....
My pump snarled up a storm but it did get me another 5-6psi boost...
Another thing to factor in is the age and history of the IP as well....when you find a 1st gen with 30K on it, you can usually bet the pump/injectors etc haven't been touched so the wear and tear will be far less than on one that has had some skillfull tinkering done to it.

Personally if I were to set up a pump for a "normal" daily driver with a touch of tweaking I'd have the inj. set to 260 bar or the upper limit of 265 bar...Now that's just my opinion mind you but I think the pump will stay together without so much snarl'N under the hood..

Another "off the top of my old head" thing.... during it's lifespan the holes in the inj. tip actually wear away from just plain erosion. When you drill (traditional drilling) a hole in somehthing the entry/exit of the hole is a sharp angle. It's not rounded out as is the case when tip gets worn due to age.
OK, now I don't mean huge jumpin big radii but just leading more towards a radius'd entry. (not the exit cause it's not subjected to the same directional flow.

 

Well i got my injectors rebuilt with bigger nozzles and WOW, what a difference. Really cut down on the smoke level and the low end torque is way up...along with high end

4 out of 6 injectors were weak and they were wet when we pulled them out.
My suggestion... If you have stock injectors with a lot of miles, then get new tips! Definately worth the $250 installed.