Lds Injection Pump On Ldt

[Jeepsinker]

I know both are, but which one is LDS and which is LDT? That's what I meant. Is the longer one the LDS spring?

 

[gimpyrobb]

Shorter is LDS.

 

[RAYZER]

Both and LDS and an LDT.

I do not think the springs are the only difference in the ldt pump and the lds pump.

I agree there must be other differences, the HH for one, the smoke cam comes set up different also.
I'll look for other physical differences in the ip tm.

 

[RAYZER]

"AR" head being the Lds.

 

[RAYZER]

http://www.jatonkam35s.com/DeuceTechnicalManuals/TM9-2910-226-34.PDF
Here's the tm on multifuel injection pumps, i can't find any real differences in specs or part numbers between the code B and code E pump lower unit internals IE advance unit, control unit, govener unit except spring rates in the advance and govener units, and how the smoke cam is set up.
Couldn't find any spec info on HH internals between the two, no info on fuel delivery volume or fuel timing.
Disclaimer: I could have missed something.

 

[red]

Going off the graph looks like 1800-2000 rpm is the sweet spot for cruising with torque and fuel economy

 

[RAYZER]

Going off the graph looks like 1800-2000 rpm is the sweet spot for cruising with torque and fuel economy

Keep in mind that this is an ldt engine which has a different cam than the lds which I'm sure makes a difference in performance between the two(an entire discussion on that somewhere else).
The lds pump with its advance timing caricteristics i believe brings the ldt performance and power band closer to performing like an lds but not exactly like the lds graph specs, but this is just speculation at this point.
When i pull the trailer and work it the hardest I'm usually running 2500 rpm's for prolonged periods, i got around 8 mpg under those conditions, it remains to be seen if I do any better with the lds pump, i doubt it.
Reluctant to say it but on my test run yesterday I ran it up to 2800 rpm's for about 2 seconds! Little bit scarry!
Pic taken at the 2014 Ga Rally.

 

[doghead]

Glad to hear it's running well now!

 

[Tow4]

Reluctant to say it but on my test run yesterday I ran it up to 2800 rpm's for about 2 seconds! Little bit scarry!

Don't be scared Ray, I saw a thread last week where someone said they are turning their multi fuel 3200 rpms, or something crazy like that.

Oh, and ealse is else. Stupid phone....

 

[Jeepsinker]

But Rayzer doesn't want to knock a hole in his block after doing all this recent work.

 

[welldigger]

But Rayzer doesn't want to knock a hole in his block after doing all this recent work.

Who doesn't want to watch their engine internals in action?

 

[RAYZER]

Well guys, reporting back from a 200 mile round trip to the Fl Rally and I'm very pleased with the performance of my new Lds pump!
The trip consisted of interstate most of the way with some pretty good grades to pull,
The new lds pump gives me more power to pull these grades with less downshifting!
The new combo pyrometer/boost gauge I installed before I left on the trip proved to be invaluable for tweaking the fuel screw, i think I have it just right!

 

[gimpyrobb]

Sa-weet! Glad it worked out for ya.

 

[mark salanco]

Is that photo of the boost and Pyro reading under a full throttle and a heavily loaded engine? I'm about to put a LDS pump on my LDT engine.

 

[gimpyrobb]

Boost psi and pyro.

 

[RAYZER]

Is that photo of the boost and Pyro reading under a full throttle and a heavily loaded engine? I'm about to put a LDS pump on my LDT engine.

Yes, under full load on the expressway pulling an m146 trailer weighing 10k lbs.

 

[JasonS]

Well guys, reporting back from a 200 mile round trip to the Fl Rally and I'm very pleased with the performance of my new Lds pump!
The trip consisted of interstate most of the way with some pretty good grades to pull,
The new lds pump gives me more power to pull these grades with less downshifting!
The new combo pyrometer/boost gauge I installed before I left on the trip proved to be invaluable for tweaking the fuel screw, i think I have it just right!View attachment 526375

Are the results shown in the pyro/ boost more or less fueling than the stock setting?

 

[RAYZER]

Are the results shown in the pyro/ boost more or less fueling than the stock setting?

Not the stock setting.
The fdc unit (where the fuel screw resides) was missing from the lds pump when given to me,
I used the fdc from my Ldt pump which had the the fuel screw turned up.
upon installing this fdc on the Lds pump i turned the fuel screw down about 12 flats to be on the safe side and tweaked it down a little more from there.
I feel comfortable with where it's presently set in relation to the topographics of my area but on my next Ga trip I will turn it down some more due to longer and steeper grades on the route.
I'm now contemplating a manual fdc adjustment via vernier cable (to adjust fdc smoke cam ramp up or down)for the ability to tweak fuel rate on the fly.
I believe someone has done this already, i haven't searched yet.

 

[gimpyrobb]

Yes it has. I'll try to find it when i get home to a PC.

 

[RAYZER]

Found it!
http://www.steelsoldiers.com/showthread.php?p=646938