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Injector Nozzles

6.2 turbo said:
I used to run waste motor oil also. I didn't like the carbon it put on the injector tips,and also inside the precup. Looks like tan concrete,and just as hard. I also seized a few pumps from it,one was a .370 plunger,and will probably never find one again.
Click to expand...

I have NEVER had a problem with pumps. I been running wmo for years. In a vast array of engines. One key to doing it. FILTER FILTER FILTER, and half inch feed line to the injector pump.

I will agree on the injector issue. I do fight it, and am currently working on a way of keeping the tips cleaner.
My biggest issue is I don't give a care about the 6.5. I only bought the truck to repower, and while the 6.5 is running, I am experimenting to get a bit of knowlege about it.

If you guys can gain a bit of good info from my experiments and crap, great. I'm just posting MY experience!
Thanx guys!
 
I have a friend who used to use WMO, cept he would blend it with a little bit of this, little bit of that. You know, some kerosene, some gas, etc... Now he makes bio diesel. Much better. Then again, he drives a dodge, and you know how them dodge guys are...LOL
 
great white said:
Do you filter your WMO?

Like down to a couple microns?

Free fuel isn't free if it takes out an injector pump....:eek:
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Filtered to 1 micron before it gets to the truck.
I bought a db2 pump on ebay for $50. That's less than a tank of fuel would be. And I have over 10,000 miles on strait wmo. I can afford to replace a pump every so often!

Just a bit of "fyi"- the military "multi-fuel" injector pump is almost an exact copy of the db2. And they run ANYTHING thru them. I have more issue with the injectors (crapping up due to ash deposits) than anything else in the system.



Now, this thread is about injector nozzels. So much for the derail...
 
Well one more highjack! I got here late. As long as your fuel/s are filtered and not gelled you won't have a problem. I ran everything/anything I could get my hands on while operating my last buisness went 60k miles just fine. Still ran strong when I sold it. It was a DB2 also.
 
Cumminsfever said:
Now, this thread is about injector nozzles. So much for the derail...
Click to expand...

Not that much of a derail, what viscosity fuel the nozzles in question are running is a important factor.

The MB diesels are supposed to excel at running old diesel and waste oils. Maybe the that pre chamber design is why.

Any out of the box investigation into saving money is appreciated by me and the others I am sure. Don't be put off by debate over your presentation :thumbsup:
 
L98TPI said:
Not that much of a derail, what viscosity fuel the nozzles in question are running is a important factor.

The MB diesels are supposed to excel at running old diesel and waste oils. Maybe the that pre chamber design is why.

Any out of the box investigation into saving money is appreciated by me and the others I am sure. Don't be put off by debate over your presentation :thumbsup:
Click to expand...

Thanx for the props! My utter lack of language skills makes me look like an a$$, or may make you feel like one when you read what I say.
It is my intent to present MY experience, my theories, and hope y'all can benefit from it somehow!

I would personally like to hear more on the mercedes tips, and how they work, or don't work.
 
Cumminsfever said:
Filtered to 1 micron before it gets to the truck.
I bought a db2 pump on ebay for $50. That's less than a tank of fuel would be. And I have over 10,000 miles on strait wmo. I can afford to replace a pump every so often!

Just a bit of "fyi"- the military "multi-fuel" injector pump is almost an exact copy of the db2. And they run ANYTHING thru them. I have more issue with the injectors (crapping up due to ash deposits) than anything else in the system.



Now, this thread is about injector nozzels. So much for the derail...
Click to expand...

Not sure about the derail or not but I applaud you for sharing yr experiences with us!

I am all for any potential way to beat the cost of fuel. I ran a 1990 7.3 IDI back a few yrs ago when the fuel price spiked to almost $5 gal on everything & anything I could filter & blend. It ran on anything I had the balls to pour in it...and other then the additional filters it ran dam well & for 20K miles without a hiccup.

Yup it's a risk but so is riding my Harley...
 
So cumminsfever do you think it was the 3200 psi or the marine injectors or both that helped the power? I have always thought about going up in psi, I was only thinking maybe 500 Psi but maybe Ill set mine up 1000 Psi more. using stock 6.5 Turbo injectors and a 6.2 pump Idk If the pump will be able to handle the 3,200. I feel like the fuel timing would be very retarded and Id end up having to buy a timing tool to get it right.
Do you have your pump advanced?
Is your IP a 4911?

Also Im not sure if NON-coated pistons could take the higher pressure even though the pre cup gets the hit first. What psi does the 7.3 IDI run?

Just some questions wondering around in my brain lol Maybe when I change heads I'll give it a try :)
 
cub124 said:
So cumminsfever do you think it was the 3200 psi or the marine injectors or both that helped the power? I have always thought about going up in psi, I was only thinking maybe 500 Psi but maybe Ill set mine up 1000 Psi more. using stock 6.5 Turbo injectors and a 6.2 pump Idk If the pump will be able to handle the 3,200. I feel like the fuel timing would be very retarded and Id end up having to buy a timing tool to get it right.
Do you have your pump advanced?
Is your IP a 4911?

Also Im not sure if NON-coated pistons could take the higher pressure even though the pre cup gets the hit first. What psi does the 7.3 IDI run?

Just some questions wondering around in my brain lol Maybe when I change heads I'll give it a try :)
Click to expand...


I did have stock nozzel set to 3000psi, and they ran good and clean, but crapped the tip due to the WMO. It had basically the same manners as the marine tip, it just didn't have as much power as these marine tips.
As far as the timing goes, there is no reason for concern in my opinion. Timing advance is... well... all there. Or, maybe it would be better said as "it is not lacking timing".
Have no fear of precup, or piston stuff. If it could die, mine would have. I drive it like I stole it, and it hasn't melted or otherwise given any issue in 12,000 miles that I have it...
 
Okay nice! I have my pump advanced right now and turned up which also advances it a little and im at 2800 psi I think (whatever stock 6.5 pop is) and the 6.2 pump is supposed to have 1,800 psi injectors IIRC.
Did you have any hot start issues like 6.2 turbo?
6.2 turbo Did you notice a power increase?

I have never been sure about the marine injectors helping HP as everyone else seems to say they don't notice anything, maybe its the pop pressure or maybe its the fact that the stock ones weren't handling the WMO well.
 
No starting issues that I can tell... altho it is kinda hard to say, due to the fact of not having working glow plugs.
The stock injectors with 3000 pop pressure didn't run like this when they were new. That is for sure.
My pump is the small plunger db2 with the screw in the whole way, and timing advanced... ahh... I don't know where! It rattles, it runs, and I drive it.

If you are worried about the pump, I can't tell you alot, but I can say that there is other direct injected engines that use this same style of pump @ 3500psi pop pressure, and no issues. So I don't see why our pumps can't handle it.
 
I was mostly worried about timing, I was wrong stock 6.5 pop pressure is 2100 so bumping up to 3200 would be 1100 psi increase, Hmm I feel like this will adjust my timing a bunch.

When do you plan to re power cumminsfever? maybe Ill buy your injectors lol
 
Honestly. You don't want my injectors.
They are the cheap ebay ones. I needed injectors, and I'm cheap!!

I won't say timing don't change, cuz it might. But it didn't change enough for me to notice.

Repower is scheduled as soon as I get the 4cyl built, and another dependable vehicle to drive!
 
A couple thousand mile update.

After installing glowplugs (again), I found VERY hard starting with a warm engine. It starts nicely on a cold morning, but once the engine is warmed up, it is a BEAR to start. Cranks and cranks. Floods itself. But REFUSES to start. I should try a couple gallon of strait fuel to see what it does, but I'm too cheap!

For the fuel mileage and power gain, I'll put up with the hard starts.
 
Not meaning to derail this, but has anyone tried to take the injector tip off and ceramic coat it inside and or outside ?? I use several different coatings myself for various parts of the motor, some of the coatings are a very slick type like DFL-1, CBX for turbo pistons & cups etc,, and TLHB for the internal hot side of exhaust runners, valves,manifolds,turbos, and such, this is a very slick and very high heat reflective stuff that can be sprayed, flowed, brushed, but has to be baked at 700 deg to cure ( the TLHB ).

Just wonder if this has been tried, I am doing a complete coating on my build now, I wonder if any of these products could keep the build up of carbon on the tips????

I'm game to try it, I have several sets of injectors here but have never tried it, and I don't use WMO either just ULSD.

I will be coating things in the next few weeks so if someone that has a problem with build up and is willing to try it I will do it as a test...
 
Cumminsfever said:
A couple thousand mile update.

After installing glowplugs (again), I found VERY hard starting with a warm engine. It starts nicely on a cold morning, but once the engine is warmed up, it is a BEAR to start. Cranks and cranks. Floods itself. But REFUSES to start. I should try a couple gallon of strait fuel to see what it does, but I'm too cheap!

For the fuel mileage and power gain, I'll put up with the hard starts.
Click to expand...

sounds to me that your head and rotor is too loose... you run a 4911, correct? we have never run a 4911 yet, but we source our .310" pumps from 6.5l N/A vans from the mid 1990's.... 2831-5088... good pumps, just detuned for NA, crank it up, and it is a 4911 minus the wore head and rotor issues...
 
Sadly, I don't remember what my pump is. All I know it has small plungers.

What has me a bit puzzled is how it is actually injecting fuel (if it is a worn pump), because after it starts, it puts out a HUGE cloud of smoke. Ehh... it runs, gets consistant 18mpg, and easily runs away from a stock '02 powerstroke.
 
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