Power Adjustment screw

[MCurrie]

How far can you turn the power adjustment screw? Can you turn it to far? What does it move or push against? I don't have a baseline as the previous owner messed with it already. Essentially can I hurt the pump by turning it to far?

 

[Greenleaf]

See your PM

 

[mysteryman]

does it smoke at idle? if it does it is already turned up. turn it up too far and you could blow the pump. It is not the "power screw" it is the pressure limit screw" If the pump was stock I would say 1. 5 turns is safe... . You might want to check your total pump output pressure and check that to the spec. in the book . A good rule of thumb is "if it is not broken do not screw with it"



with an empty truck with the pedal to the floor on a 70 deg day... ... . if the egt's are in the 1100 deg. or up range you do not want anymore fuel untill figure out what you are going to do about getting more air in to cool it off... .

How far can you turn the power adjustment screw? Can you turn it to far? What does it move or push against? I don't have a baseline as the previous owner messed with it already. Essentially can I hurt the pump by turning it to far?

 

[MCurrie]

I can get to 1000 deg. I thought 1300 was the safe limit for these engines. What is the safe egt limit for all day long on the highway? Right now I run between 800 and 900 at 80-85 MPH.

 

[Greenleaf]

Probably 1100/1200° would be ok for sustained loads. Providing that the cooling system would handle the heat.



GL

 

[bgilbert]

What is the safe egt limit for all day long on the highway?

Cummins says 1250*f preturbo for all day long driving. At that temp your cooling system will become the weak end. You'll be watching both the pyro and water temp.

 

[DValentine]

I agree with Bill. I have mine "tuned" to run right around 12-1300 with the 5'er behind me. I guess I could give her some more fuel but I don't want to be looking at the pyro all the time. I can lay on the coal with the egt's right up there but the cooling system gets the best of me on a long hill.



good luck



Dave

 

[BushWakr - RIP]

Yup, go with 1200*F - 1250*F max... that allows for "some" error in the pyro probe/gauge. What happens after sustained runs at that temp is the hard parts/castings and cooling system become heat saturated and you need to watch water temps... that's were the watch your cooling system thing comes from.

I also think 'mystery is on the right track too... . it is a "generally accepted" rationale that you can turn the fuel screw in until it starts to make noticable impact on your idle value... from there on, you're impacting general/overall pump longevity due to demand. On the plus side you don't have to "demand" all the time... . even if it is fun. .



pb...