Engine/Transmission (1998.5 - 2002) Stage 3 Injector Nozzles

[Pmaloney]

I've felt a few injectors whose pop pressures were off, its real easy with a stick that is in neutral. When the engine isnt running smooth you can feel it through the stick. You can also hear it at idle through the tone of the exhaust plus you can see it by the way the engine rocks on the motor mounts. Just the way I have seen it before.

 

[KERMA]

If the nozzles are poorly made, the pop pressures will be all over the place. If the nozzles are well made, pop pressures will be right in line and consistent UNLESS the injectors were shimmed in a previous life.



POP pressures have nothing at all to do with the spray holes. Everyone focuses on the spray holes, because it is "easy" to see, and you can actually measure them somewhat with a pin gage, and see it with a microscope or jeweler's loupe or magnifying glass. It is tangible, easy to relate to.



BUT... it is far from the most important aspect of what constitutes a "quality" injector nozzle.

 

[Pmaloney]

Dl5treez, no offense taken at all, different practices/opinions are what this site revolves around. If I was doing the injectors as a side job for money I agree with you 100% that I would test them, when money and time are involved I like the less time/more money approach. It makes the customer happy and me happy. As far as my own things go I take the immediatly faster route, dont know why, probably due to any time I have for my things is very limited. I still have a water/meth kit in the garage begging to be installed. Just no time Once again no offense taken. Like you said it is a chance you take with NOT pop testing them, I have always taken chances and the hard road, look at my signature that should explain it all

And to reply to KERMA, I have found the quality of an injector nozzle is not the only thing that affects the pop pressure, variations such as spring tension differences and slight machining differences in the injector body can also change the tension requiring different shims. Not trying to demean (sp. ?) anyone or start any :-{} just some things I have seen Any way anyone does the install, the point of this thread was the value and the :--) factor of such a "cheap" upgrade. BOMB on!

 

[JWBoothe]

Cheap!!

I bought the injectors from this place http://www.autoanything.com/product...e _jammers_dodge_performance_injector_nozzles they are just the nozzles, install was very simple.

Why are these nozzles so much cheaper than injectors found elsewhere such as Rip's website?

 

[Pmaloney]

Because with these it is just the nozzles and plungers, you have to split your current injector in half and install these nozzles yourself. Where as the others are complete injectors.

 

[DLausche]

How easy/difficult is it to swap out the injector nozzles? I'm not a mechanic but do most all of the work on my truck myself. Is this something within the reach of a home handyman or are special knowledge and/or tools required?



Thanks

-Deon

 

[JWBoothe]

How easy/difficult is it to swap out the injector nozzles? I'm not a mechanic but do most all of the work on my truck myself. Is this something within the reach of a home handyman or are special knowledge and/or tools required?



Thanks

-Deon

... ... and do you sacrifice any performance over buying a complete injector?

 

[KERMA]

And to reply to KERMA, I have found the quality of an injector nozzle is not the only thing that affects the pop pressure, variations such as spring tension differences and slight machining differences in the injector body can also change the tension requiring different shims. Not trying to demean (sp. ?) anyone or start any :-{} just some things I have seen

NO argument here, other things can affect the pop pressure.



But if you have poorly made nozzles the pop pressures will be all over the place. Consistent pop pressures is a dead giveaway of nozzle quality. If you then replace the marginal nozzles with good quality ones most of the time they will come right in line. The difference (in pop pressures) from just changing nozzles can be profound. Seen it happen many times, and OEM Bosch is usually in the "marginal" category. That is why experienced techs always insist on pop test/shimming because that is the only way to be sure you get it right, and they are used to OEM Bosch.

THe effect of differences in the springs, shims, and other injector internals is not nearly as critical as the dimensional tolerance and consistency between the nozzles. The nozzle internals are the most difficult dimensions to get correct and consistent. Very small (microscopic) dimensional inconsistencies inside the nozzle have a large influence on pop pressure.

 

[Jason_K]

Any info as to if these are accurate HP #s from the nozzles? Has anyone tested any of them yet?

 

[Pmaloney]

I am not sure about the ratings, havent dynoed yet or ever to know. I know there was a big seat of the pants different and as I said earlier my clutch will no longer hold on level 3 or higher where before I could abuse it on 5x5 and it would hold good, so there definately was an increase. Also if I set it on sublevel 5 on almost any setting and lug it I can black out a street :-laf So more fuel is definetely being added.