Injector flow rates\hp ratings

[PToombs]

I never go by horsepower, it's too vague IMO. X hp under certain conditions, but no 2 set ups are the same. I always go by the size of the injector and compare them to what I have for a guesstimate of what they'll do.

[Tacoclaw]

Does "LPM" stand for Liter/minute? That seems like a weird measurement for air, wouldn't that vary wildly depending on the air pressure? There's technically a lot more "air" in a liter at 150psi than at 10psi.

[RCCUMMINS89]

Yes... and yes.... it is done at 50psi worth of air.

I've said this numerous times... cc is a more accurate way of doing it. However..... as far as matching flow rates, I've never once in my life seen where the air method isn't just as good as the fluid way. Meaning, I've yet to see where a matched set of "lpm" nozzles were even .1cc off from each other on the "cc" chart. Due to the way I've had some of my custom nozzles done (order of work), I've had comparisons on.... oh.... probably a couple dozen 12 valve injectors. Not a lot, but enough to see that it is a very accurate way of matching nozzles.

[DodgeFreak]

As long as the tests are all the same I don't see how it couldn't be just as accurate...just like any test, keep all the variables the same for each test and they all should be accurate.

Do you know what the lpm is in relation to CCs?

[93flatbed]

Isn't there a few builders that rate their fuel flows in LPM?

I know most guys understand that the LPM rating is in air, but fuel flows differently than air doesn't it? Wouldn't giving the liquid flow be more accurate than the air flow of an injector? Just a question not wanting a fight/argument.

[BC847]

I know most guys understand that the LPM rating is in air, but fuel flows differently than air doesn't it? Wouldn't giving the liquid flow be more accurate than the air flow of an injector? Just a question not wanting a fight/argument.

The Schied 6x.016" nozzles I use to run were not too long ago tested to find their flow with the standard air test. The results: "well over 100lpm" (air).

They were later tested again and found to flow 4.65lpm (liquid).

[93flatbed]

Interesting Dave. What pressure and what spray angle? Were the bodies modified at all?

By "well over" does that mean they weren't able to test them or .....?

[RCCUMMINS89]

Isn't there a few builders that rate their fuel flows in LPM?

I know most guys understand that the LPM rating is in air, but fuel flows differently than air doesn't it? Wouldn't giving the liquid flow be more accurate than the air flow of an injector? Just a question not wanting a fight/argument.

If one is to solely use it to match flow injectors, then it's not gong to make a difference (between a set, with the same mods).

This is where it can get off.......

5x16 SAC nozzle with no honing or pintle mods... vs Let's say a 5x13 SAC nozzle with pintle mods and honing. They may flow the same lpm in air... but due to pintle mods and honing, the 5x13 (assuming they flowed the same in air) will flow more fluid/diesel than the std. 5x16 SAC.

This is obvious when we have tested lpm vs cc in fluid with honing. A 55lpm non honed injector generally flows 15% less on the fluid chart than the 55lpm nozzle that has seen hone work.



Ever wonder why I made so much power on a "48lpm" injector... and why DDP makes so much power on such little nozzles.... they flow more than lpm leads on.


But again... for the simple purposes of match flowing... it works. Is fluid better....YES

[93flatbed]

Gotcha, thank you for the explination. I would not have thought internal body work would matter when it comes to liquid vs. air.

[RCCUMMINS89]

It can.... but, a ve pump (even a 14) will/can actually be hindered by too much internal volume pre-nozzle.

[DodgeFreak]

Because it takes to long to fill??

Can you explain what they do when they modify the pintle?

[93flatbed]

Yep I've read/been told that with guys who just drop a 14mm h&r with worked injector bodies have had some issues.

[RCCUMMINS89]

Correct, it takes more effort to re pressurize the lines/area

[93flatbed]

DosgeFreak if you look at Weston's injector post in this section it should explain what you are asking. I know what is done, do I 100% understand it? NO, so I won't butcher the explanation. I'm sure Eric can explain it in a way that most can understand. Edge filters also can be removed/modified for more fuel.

Things can be done inside to get more fuel out of injectors that sound small when saying the hole count and 0.0XX"

[DodgeFreak]

I've read that before (just reread it) but didn't think much of it....now the pictures are gone lol....Does anyone know where to get the pictures from??