full power screw

[Power Ram Man]

how much power would i see if i turned the full power screw at the back of the pump? maybe one to two screws

[Underpsi]

it really is different with every pump but with two turns you will most likely feel a difference. Just try it and if you don't like it then make sure you remember how many turns so you can turn it back. Although you probably won't want to

[CAJUN 93]

some pumps it will make very little difference, others will try to runaway. just be prepared with a board to shut it down, just in case. 2 turns on mine made for a completly different truck.

daryl

[Power Ram Man]

Carolina Cummins lives right close to me i think im going to let him do it, he said you would feel the difference, but not as much because it has an intercooler

[89dieselkong]

On mine I only got 3 turns on it (with the collar off) before runaway. It is a whole other truck though

[oldestof11]

Mine only went in about 2 turns then I couldn't turn it no more. Does it get hard the more it goes in??

[TWorline]

Mine only went in about 2 turns then I couldn't turn it no more. Does it get hard the more it goes in??

When it gets to where there is a lot of resistance that is the end of your adjustment. Some guys have taken it out and welded more on the end then milled it down for further adjustment.

[Begle1]

So what is the maximum number of turns people get? 6?

[seeker1056]

hmm, not sure how many turns.

When i removed my power screw there were about three threads a smooth shaft and then a hex portion of the screw showing past the weldedd collar, and all of the pix I have ever seen of a stock screw/collar show just the hex end of the screw, not the shaft and threads.

I wanna say I had about 8-9 turns, and have yet to get to runaway.

Fact is I ran out of low idle adjustment first, tryin to turnin the idle down.

Currently I am sittin at 758 hot idle

[oldestof11]

Shouldn't I get more turns tho?? And how will welding and grinding help? I am trying to learn here as one of these days, I want to mod these (swap parts). I guess I really want to know how it works and improve on it.

Jon

[PToombs]

When you weld the end, you are making it longer, thus it pushes farther. It would be like having more threads.
There is a shoulder on the screw, this bottoms in the hole. The first part of the hole isn't threaded, this is where the shoulder (holds the o-ring seal) rides.

[oldestof11]

AHHHHH!!! *And the light bulb goes off* Thanks!

Jon

[charger 69]

As you said it must be different between pumps,I turned mine 3.5 turns and no sign of it wanting to run away.

[90firstgen]

We had an unofficial poll on DTR awhile back and it seems that the non-i/c pumps tend to run away more than the intercooled ones. Not sure why...

[CAJUN 93]

just another reason you "intercooler challenged' guys have it soooo tough . makes up for ya'll have real injectors in it from the factory.

daryl