P-pump Inj. Lines

[RacinDuallie]

It seems that bigger is not always better......

So it would be interesting to hear from those that changed to a larger size lines and the gains or losses you've encountered.......

[massdiesel]

tell you this weekend trying three different sets

[COMP461]

Funny ,I run stock size , done By John Russin at Budha Power

[gunracer1]

it seems there is a pretty big trade off with the bigger lines when it comes to drivability.

[oldsmokey97]

is there any kind of gains associated with running larger injector lines???

seems to me that it might give you less power because the fuel does not have the pressure that it does with stock lines.

[RyanB]

This week I finally got around to pulling my .093 Stainless Steel lines from Haisleys out of the bag...BOY they look nice! turns out Scheid who build the lines still had there tag on it.... SS 12valve/water injection .120 Damn, these lines are .120's!!! Called up Patty right away and she seemed to think that with my fuel my pumps putting out it should be okay on the track...she said though to try them out and if not just send them back and they will get the .093's for me!

Thinking I might just have to put a set of Laser Cut's on the pump just to tweak a bit more fuel for those lines though!

RyanB

[BigBadDodge]

I agree with smokem, you have to have a pretty serious pump, putting out some big cc's, lots of fuel pressure, timming, and RPM's.

BBD

[TJSHOTROD]

Originally Posted by Smokem

Drag racers bash away. Most of the larger injection lines are used in pulling applications where the RPM being used is well beyond the efficient range of the motor. A diesel injector at 4k RPM is half as efficient as it would be at 2k RPM, so to compensate larger lines and increased timing are used to allow for as much volume and injection cycle length as possible. This works in sled pullng because they usually leave the line at say 5500RPM and try and keep the motor turning at 5000RPM at the big end. Where as in drag racing the larger lines might affect performance at the line ie: staging and spooling issues with a converter. I believe this is part of Greg's Rev Gain theory, and in reality I would not want to try and spool a turbo with 0.120 lines and a tight converter at the track.

Just trying to understand why a diesel injector is half as efficient at 4k than 2k. Can you please explain?

TJ

[TJSHOTROD]

Smokem is that a no or is it a secret? Just tring to understand.

TJ

[TJSHOTROD]

Originally Posted by Smokem

A diesel motor only has half the time to atomize the fuel at 2K RPM than at 4K RPM. A diesel motor will smoke when there is little manifold pressure or not enough time for atomization to occur. This is why most heavily fueled trucks run high or early timing, they are trying to lengthen the amount of time from injection to TDC. There really isn't any power at 5K RPM, but hp is directly related to RPM, so in both drag racing and sled pulling wheel speed is important and high RPM will achieve this. What the 5.9 truly needs to be remotely efficient at these RPM levels is airflow, this is where a cylinder head that would flow twice the CFM could be very useful. Camshafts, ported heads, matched valves, and nitrous oxide are only crutches, rather than being used to their full potential, they are being used as aids to a bad design.

I agree that a truck will need more timing at high rpm's but the injector is not half as efficient as you stated the motor just needs to be tuned for high rpms correct.

TJ

[RyanB]

Well this weekend I decieded to try out the .120 lines before I put the truck away for the winter. Up untill now the engine has been detuned and really needed more fuel. I put in my 191 DV's and my .120 lines and my Haisley 5X18 injectors. Its alot harder to start now with those big injectors but once running its great. The big lines give the engine a real lopey idle and I actually had to turn the idle up because it dropped 250rpm with the big lines.

On the road its great other than at around 1200rpm in 1st and 2nd it can really start to bounce around but it smothes out fast with a little fuel!

I have really noticed how the big lines fuel and how much harder it seams to hit as the rpm goes up.

Anyway, just thought I would share this with you all. now all I need to do is finish my twins...couldn't hold it for long before I saw 1500 with my Sled Puller 66!

RyanB

[AsTroSS]

Difficult to start or difficult to keep the engine running at idle speed.

[Outlaw1]

Good information.

It sounds right in line with what I've heard before.

[Soup Nazi]

There are too many variables to say one is better than the other.

Stock is 1.8mm on the 12V ( .071" )

From there you have a few choices. Up or Down.

We tried them all. 2mm ( .079" ), 2.133mm ( .084" ), 2.36mm ( .093" ) on the 12 and 24 V engines in literally dozens of combinations. We stopped at .093"

Unfortunantly, the "correct" size is not a one size fits all scenerio. Generally speaking with the P pumps that are commercially available, the 2.13mm's are pretty hard to beat.

[oldsmokey97]

I kinda want a little bit of a lope!!! But not a whole lot. I am seriously thinkin about getting the .093"!! How do these work?? Do they lope real bad or just a little???

[oldsmokey97]

i know some of yall have run them before. Fill me in pleassse.

[CC12V]

There are alot of variables from truck to truck also. I never had a loping problem or starting either.The reason I changed was to make my pump live.

[oldsmokey97]

How is lope with the .093 lines and the .120 lines???
I kinda like the lope but, I want it to still idle.

Lance

[oldsmokey97]

yoo hoo???????

[AsTroSS]

Thanks Joe from Hellmann Performance

I just recived nice set of Stainless-Steel 0.120 fuel lines .

My next step: my own designe cut off aluminium intake


And ofcouse I have to polish the lines