My bad ... you're correct in that no one would order one at a time, so $350-ish.

I can't remember the specific time period but sometime past 3 Years ago when there was no Monark Nozzles be had the Monark Nozzles had some quality issuse. Apparently Monark stopped production and for not quiet a Year you could not get any new ones (meaning there might have been some old stock left that showed up occasionally) in the US.

As far as I Have read since Monark resumed selling here in the US there has been no issues with their Nozzles.
Of course that does not mean that some problem could not show up again.

Also before the Nozzle shortage there had been at least 3 Places besides MS selling the Monark Nozzles and one of our Members also used to sell them. Now othere is only one Seller.

greazzer has been doing most of the Injector rebuilding ask Him if out of 100 Monark Hozzles how many were sub par.

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84 300D, 82 Volvo 244Gl Diesel

Out of 100 Monarks (actually, they come 24 in a box so out of 96), you "could" have maybe one bum nozzle. I have discovered that new nozzle issues are related to a metalic grit inside the nozzle. So, I suspend my nozzle and pintles (do not mix them up or they are most likely toast) by a nail with a magnet on the end while running them thru the ultra sonic cleaner. You will end up with some super fine metalic black grit on that magnet and that generally resolves any issues with the Monarks. Out of 50 Bosch's (I really don't do a bunch of Boschs, but I can recall at least 10 sets (5 x 10) where folks insisted on Boschs), I can say you would end up with one bum one out of 5. That is, every set of 5 had at least a turd which no matter how much cleaning, I was not really 100% satisfied.

So, comparing a 20% Bosch failure rate or not happy rate compared to a 1% Monark Rate, it looks pretty clear to me regarding quality control. Now, Monark is discontinuing the #315 nozzles or at least not selling them any more for a while, so I am not sure about the supply issues.

Bosios ... out of 50 (recalling my last 10 sets) and not a bad one in the bunch, but Bosios do flow more fuel while maintaining a decent atomization vs. a watergun like blast.

I commented on this about 5 Years ago.
Back in 1975-1980 when I worked in a Fuel Injection Shop whe used Bosch Injector Nozzles not because they were the best Nozzles but because they were mostly adequate and cheaper. At that time the Nozzles were mostly made in Germany.

American Bosch, Simms, CAV and Brayce (spelling?) all made better quality Injector Nozzles then Bosch which actually Robert Bosch.
The Nozzles made in the UK did not have as nice of an exterior finish as the Bosch Nozzles but were made of Much harder Metal. The American Bosch Nozzles had the Nice finish and also the harder than Bosch Metal but the cost was twice as much for them and their coverages of other makers Injectors was small.
Bosch sells Injector Nozzles for about everyone elses Injectors so when we could get them We bought Bosch due to the better cost break for My Boss and also the Customer.

The first year I worked Bosch Nozzles were OK but after that their quality seemed to go down. I rejected a lot of Nozzles because some would pee just a bit or drip a bit in one of the tests.

Cleaning the Injector Nozzles. I have found pieces of Metal inside Nozzles and even good sized chips. If the crud gets between the Pintel and the seating area in the Nozzle and smashes some Metal Partical or Chip it can ruin the seating area inside of the Nozzle.

Bosch sent My Boss a letter saying that they changed the Standard of the Test and were were no longer allowd to reject Nozzles unless there was more the X amount of drips and I could not reject them because they did not make that chattering sound when the Nozzle opend.

Also 2 or 3 times a Year My Bosch got a letter from Bosch telling Him We were not selling enough of their Products mentioning it might effect or Bosch Certification.

When I got My Volvo around 1992 the VW Rabbit Nozzles I used to rebuilt the Injectors were Bosch Made in Brazil. At least during Pop Testing and on the Engine the were as good as the German Bosch Nozzles.

So for Me even the German made Injector Nozzles from the past were sort of like General Motors type quality. And, the Monark Nozzles are certainly comparable to the German Bosch Nozzles I have tested.

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84 300D, 82 Volvo 244Gl Diesel

Diesel911 ... your views on Chinese nozzles.

On the Rockwell scale, their metal strength or hardness I should say is actually harder than German steel (Monarks). Would you speculate (and I find your information to be learned and authoritative) that if all Chinese nozzles had the "harder" steel, they would fair at least as well as Bosch's (current stuff and not NOS)?? I say this since about 1 maybe 2 years ago, I was ready to squeeze the trigger on a 1,000 nozzle purchase. I am assuming the Chinese makers are not going to bait and switch me.

I know about 2 years ago I installed a set of Chinese nozzles for a forum member on STD, and it took a LONG time until I figured out the metal dust deal.

Your thoughts please ...

3 years ago, in the great monark nozzle shortage, I was forced to buy bosch rebuilds from AZ....Amazingly they appear to be holding up very well with all the complaints I have heard about them....maybe I got lucky and got some good old stock ones....one day they will be shipped to greazzer to have monarks installed...

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Rogviler,
If we haven't lost you, let us know where you are. Somebody nearby may have a pop tester. I built my own w/ electronic recording (post). My guess is that spray pattern and leak-free are much more important than pop pressure. I say this because it makes technical sense (research experience in liquid sprays and combustion) and because I found that 3 of 5 injectors in my 84 300D were non-turbo (1600 vs 1950 psi pop), but changing them made no noticeable difference.

I have long used Chinese Drill bits and I have found them to be on the Brittle side.
So hardness is not every thing.

The Proper Alloy and heat treating for the job the are designed to do is important.

This is off subject but has to do with quality control. Where I worked My Boss bought some baisc Nozzle Grinding equipment.
The idea was to recondition Detroit Diesel Injector Nozzles and the same with some other Direct Injection Nozzles.

Not only was the process time consuming but the failure rate of the re-ground Nozzles was too high.
I am thinking that besides the Metal Alloy and heat treating issues the makers of the Indian and Chinese Nozzles are struggling with the issues of precision grinding.

I don't think you can set up a mecanized Grinding Machine and have it work well if the if the hadness and the Alloy in the parts is not reasonably consistant.

The first set of Rebuilt Injectors I insalled had some Brand X Nozzles. I thought they came from China but I was told they were made in Italy by 7-Diesel.
After about 1 years use they started nailing at idle. At that time I changed to with the Monark Nozzles.
I can say for sure it was an issue with the 7-Disel Nozzles as I had not yet gotten around to re-timing My Fuel Injection Pump. It could be re-timing might have ended the Nailing but I will never know.

During the Monark Nozzle shortage at least 2 of our Member tried Henzo Nozzles.
Injector Nozzles Henzo
http://www.peachparts.com/shopforum/diesel-discussion/321478-injector-nozzles.html

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84 300D, 82 Volvo 244Gl Diesel

Chinese Nozzle were not being sold in the US when I worked in Fuel Injection. And, in another Post I said the Shop I worked in did not put New Nozzles in the Ultrasonic Cleaning Tank.

The new Nozzles were hosed out with Solovent, blow out and dried with filtered compressed Air, and imersed in Diesel Fuel till they were assembled on the Injector. And, we could not have continued in business if that did not work.

Of course an Ultrasonic Cleaning Tank should do a better job.

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84 300D, 82 Volvo 244Gl Diesel

The Opening/Pop Pressure effects the spray pattern.
Less pop pressure causes the Fuel to hose out more.

Nozzles are designed to work within certain Pop Pressures. In this case the same Nozzle is used on the NA and Turbo Engines. So that sounds like they can handle a wide range of Pop Pressures.

But, I actually believe it is the Ball Pin in the Pre-chamber that is the biggest help. When that Ball Pin gets hot it must be an extremly good ade to combustion if any unburned Fuel hits it.

The other type of Pre-combustion Chamber like is on the old VW Diesels has the Fuel spraying acrossed the chamber to the opposite side of the Chamber against the wall of the Chamber (that part is made of special Metal). But it does not get as hot as the Ball Pin because it is right against the Cylinder Head.
So I think the Ball Pin when hot functions better at aiding in the ignition of Fuel; especially when the Nozzles are worn or Pop pressres lower than they should be.
Buy, I don't know for certain as I have not read that anywhere.

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84 300D, 82 Volvo 244Gl Diesel

I bet your car loves new nozzles now !

Oh yes, the car runs amazingly now. Big props to greazzer for helping me get it sorted out!

Nightmare officially woken up from.

-Rog