Injector line length?

[seeker1056]

I have never seen this particular topic discussed on any forum.

I know many have and are running larger injector lines with varying degrees of sucess by the way the various threads read.

Has anyone played with varying the length of the injector lines - shorter, longer, to see what it does for performance applications

I am thinking shorter would increase timing, and longer would decrease timing, amoung other things

Would the combination of shorter and larger lines be of any benefit, or longer and larger?

just curious

 

[BgBlDodge]

All I know bout line length is that they have to be equal so you'd have to base the length off of whatever is required to get to #6. Curious to see where this thread goes.

 

[j-rod]

I am thinking shorter would increase timing, and longer would decrease timing, amoung other things

Would the combination of shorter and larger lines be of any benefit, or longer and larger?

Yes to your first statement.

Larger diameter lines that are shorter than stock would be the best bet. I do not see how a longer line would be of any advantage.

 

[Begle1]

I do not see how a longer line would be of any advantage.

Longer duration. As the injection pump pressurizes the fuel in the line, the line stretches out; the line keeps the fuel pressurized a little bit longer as it shrinks back down. You get a corresponding lower peak injection pressure and retarded timing.


Is it even true or will it ever make a difference? I doubt it.

 

[JerrodGlover]

All I know bout line length is that they have to be equal so you'd have to base the length off of whatever is required to get to #6. Curious to see where this thread goes.

This is a good point for debate, so don't take it as me kicking you in the balls.

Why do you think that they all need to be the same length?

 

[RAMICATOR]

Why do you think that they all need to be the same length?[/QUOTE]

so your timing for each cylinder is the same.

say you made the lines as short as possible from the pump to the head, the shortest line, #1 cylinder, will have the least duration, and 2-6 cylinders will progressively get longer duration as the length of the line gets longer. best example i have.

i have heard some tractor guys move the injection pump to the middle of the engine with a braket and shaft of some sort, and they can run shorter lines that way, and less timing. this has gained horsepower, how much not sure.

 

[GOT-Torque]

Shorter lines produce better injection system performance. A rule of thumb is to make them as short as possible, however they must be uniform in length, therefore they will all be as long as the longest line necessary.

 

[BgBlDodge]

This is a good point for debate, so don't take it as me kicking you in the balls.

Why do you think that they all need to be the same length?

No kick in the balls at all.

Why do you think that they all need to be the same length?

so your timing for each cylinder is the same.

say you made the lines as short as possible from the pump to the head, the shortest line, #1 cylinder, will have the least duration, and 2-6 cylinders will progressively get longer duration as the length of the line gets longer. best example i have.

i have heard some tractor guys move the injection pump to the middle of the engine with a braket and shaft of some sort, and they can run shorter lines that way, and less timing. this has gained horsepower, how much not sure.

This is the reason I said that.

Shorter lines produce better injection system performance. A rule of thumb is to make them as short as possible, however they must be uniform in length, therefore they will all be as long as the longest line necessary.

And that's the other reason.

 

[Kick Start]

So wonder if there is a way to do that with our pumps? Move it to the middle of the motor. That would be interesting to see if someone does it and if it affects hp.

 

[BC847]

Generally, larger ID lines will increase/aggravate the ballooning effect as well.