Spiking rail pressure at start up

[cerberusiam]

Cavitation. . Should never be a problem with a negative feed Pump

Cavitation is probably the wrong word in this context. Oscillation of the gears going from suction to pressure that sets up harmonics in the normal gear lash is probably a lot closer description. The more supply pressure the less oscillation is going to happen because the volume is already available to the pump to prefill the pressure points, the point doesn't have basically switch directions on force to do its job. Whether its the design or just the norm, the end of the pump shaft takes the brunt of this beating and starts shedding metal in extreme cases. Its not hard to tell wher ethis metal ends up either.



Dmax pumps suffer much worse from this than the Cummins implementation because there is minimal pressure with a lift pump. Not going to name drop but some pretty reputable companies have seen exactly this as a result of low input pressures and explained it very well.



Cavitation is a problem on all pumps because of the impact again on gears when the bubbles collapse and lead to oscillations. It really will be more of a problem on a neagtive pressure pump because the bubbles expand in that scenario and cause larger and more frequent collapses when they are compressed. This leads into discussions of certain pumps and their features around air removal but thats a whole thread in itself. :-laf

Pressure and Volume are totally unrelated in Fluid mechanics...

C'mon, your pulling my leg. right? :-laf



Fluid dynamics is ALL about pressure and volume plus several other parameters.



A typical fluid dynamics solution involves calculating various properties of the fluid, such as velocity, pressure, density, and temperature, as functions of space and time



That is just about as simplistic a description of a very complex subject I can find. We need x psi to push y gph thru a 1/4 inch line, standard physics equations.



Do we need 60 psi? Probably not but keep in mind ANYTHING we do to increase and stabilize the case pressure a CP3 WILL impact the cooling\lube portion of its operation positively. Eliminating potential cavitation and\or gear oscillations is also a net benefit for longevity.



Again, where is the downside to raising the inlet pressure? Where is the technical support that it WILL cause failures? I am not seeing it yet... ... .

 

[TCDiesel]

Fluid mechanics are different then Fluid dynamics.

 

[cerberusiam]

Fluid mechanics are different then Fluid dynamics.

Fluid dynamics is the study of fluid in motion, a division of fluid mechanics. They are the same discipline.



How do I word this nicely, quit insulting my intelligence with this CRAP. Your credibility is in a steep nose dive at this point if all you want to do is play games. Either make your point or walk away.

 

[TCDiesel]

Ok ... . I give Up you are far more knowledgeable then Me... At anyrate I never insulted Your intelligence, But I do think if someone disagrees with you you push the enevlope. . nothing wrong with that until you dominate and rob everyones opinion. Why bring up Credibility, if you want to have the biggest building downtown, just tear down everyone. . Cerberusiam. . every Post I have seen you make is very informative. We are both on the same track, just a little different direction on this one.

 

[cerberusiam]

Thats now 3 posts that are off track with what I asked you, and yes the previous 2 were insulting from my point of view.



My one and only concern is your claims that that just don't hold up under scrutiny. If you have more info trot it out and lets look at the brand. I have been consistent in asking that, as consistent as you have been at avoiding the subject.



I have made it very clear I don't want :-{}, but, you are NOT making it any easier with your personal attacks and patronizing attitude. A two word answer on what fluid dynamics is crap and you KNOW it! What is interesting is your take on repeated requests to back up your statements and qualifying them as bullying and whatever else you were trying to say about opinions. You don't want you opinions questioned don't post them in an open forum. You don't want to take heat for some blatantly wrong information then pin it on some nebulous memo from Bosch that somebody sent you, THINK before you hit the enter key.



I know your smarter than that and expect some reciprocity in your answers. So far you've made yourself out be a Troll making statements and trying to shift the blame because you can't or won't back up your unsolicited statements. What do you expect?



Last, NO were are NOT going down the same path. We are are on a rapidly diverging tangent because you refuse to participate with anything other than nonsense. IMO, you are dead wrong and doing the OP plus anyone readng this a huge disservice. Again, if you have some info to the contrary post it up and defend it, or walk away. I truly would like to hear your take on this sans the garbage you have posted so far.



If your expecting me to roll over and pander to your opinions then you ain't reading me very well bud.

 

[TCDiesel]

BMeier or anyone feel free to contact us ,By Phone,Email,PM. Phone works the best for Me, Ask for Todd number in the signature.