Injector Tips

[Dakotahaulers]

Is there any difference between the 03' injectors and 05' injectors. I have a set on the shelf but they came out of a 03' and I have a 05'.

 

[KERMA]

Is there any difference between the 03' injectors and 05' injectors. I have a set on the shelf but they came out of a 03' and I have a 05'.

Yes, big difference in the nozzles. They are not interchangeable.

 

[Scrappy]

can you put a set of '05 nozzles in a set of '03 injectors and run them in an '05? I know the tips are different but otherwise are the injectors the same?

 

[KLockliear]

Just to expound on Kerma's post, the 03-04 trucks had a 143* spray angle, the 04. 5-06 use a 124* spray angle. You should not interchange them. They will physically fit, but they won't "work" in your engine.

 

[KLockliear]

can you put a set of '05 nozzles in a set of '03 injectors and run them in an '05?

Yes, same bodies.

 

[nickleinonen]

Just to expound on Kerma's post, the 03-04 trucks had a 143* spray angle, the 04. 5-06 use a 124* spray angle. You should not interchange them. They will physically fit, but they won't "work" in your engine.

03-04 8 hole nozzles

04. 5-06 5 hole nozzles

 

[JStieger]

Just to expound on Kerma's post, the 03-04 trucks had a 143* spray angle, the 04. 5-06 use a 124* spray angle. You should not interchange them. They will physically fit, but they won't "work" in your engine.

Just to bring this thread back up...



1) does the 124* spray angle reflect the geometrical layout of the 5 holes? In other words, 8 holes @ 124* spray angle will spray the cylinder walls (for example)??

2) Why did Cummins go with 5 holes on the +04. 5? Less holes = more atomization for a given rail pressure? Is this why the +04. 5 trucks idle at a higher rail pressure than 2003 trucks? Is this why the +04. 5 trucks seem to have a lot higher performance gains on stock injectors versus a 2003 truck with the same modification?

3) So does it follow that to make the 305/555 injectors more efficient it is better to go to 5 hole aftermarket tips?



Just wondering...

 

[JHardwick]

Less holes = more atomization for a given rail pressure?

I would think that more holes would atomize better. 5 holes or 8 holes equallying the same surface area ... ... ... ... . the 8 smaller holes would seem to atomize fuel better than 5 larger holes ... ... ... again, the same surface area

 

[KLockliear]

1) does the 124* spray angle reflect the geometrical layout of the 5 holes? In other words, 8 holes @ 124* spray angle will spray the cylinder walls (for example)??

Yes on the geometrical layout. 8 holes on the same spray angle will yield a similar pattern, but 8 holes typically distribute the fuel better.

2) Why did Cummins go with 5 holes on the +04. 5? Less holes = more atomization for a given rail pressure? Is this why the +04. 5 trucks idle at a higher rail pressure than 2003 trucks? Is this why the +04. 5 trucks seem to have a lot higher performance gains on stock injectors versus a 2003 truck with the same modification?

My personal guess is cost. Costs more to do more holes. But I can't say why Bosch did it for sure.

3) So does it follow that to make the 305/555 injectors more efficient it is better to go to 5 hole aftermarket tips?

Just wondering...

The other way around... 8 hole 04. 5+ would be better than the stock 5 holers.



BTW, we should have our production run of 03-04 and 04. 5-06 nozzles here this month.